I want to display calendar with some notes/events which i stored in database.
In some date more than one notes are added.
Now when page is load i want that all in my calendar control.
I done that BUT It displays only one(1st entered) note in the calendar although i saved more than one notes on that same DATE.
It looks like below image..
In this Image On Date 7 i added 2 Notes but it displays only one...
My code is as below...
public partial class _Default : System.Web.UI.Page
{
public static ArrayList MyColllection;
//Structure
public struct My_Date
{
public DateTime Cal_Date;
public string Cal_Type;
public string Cal_Title;
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
MyColllection = Get_Event();
}
}
public ArrayList Get_Event()
{
SqlConnection myCon = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"]);
SqlCommand myComd = new SqlCommand("SELECT * FROM Cal_Event",myCon);
SqlDataReader myDataReader;
try
{
myCon.Open();
myDataReader = myComd.ExecuteReader();
MyColllection = new ArrayList();
My_Date temp;
//Iterate through the data reader
while(myDataReader.Read())
{
temp.Cal_Title = myDataReader.GetValue(1).ToString();
temp.Cal_Date = Convert.ToDateTime(myDataReader.GetValue(2));
temp.Cal_Type = myDataReader.GetValue(3).ToString();
MyColllection.Add(temp);
}
}
catch
{}
finally
{
myCon.Close();
}
return MyColllection;
}
public void Calendar1_DayRender(object o, DayRenderEventArgs e)
{
string FontColor;
string compDate = "01/01/1900"; // Date to compare initially
DateTime DayVal = Convert.ToDateTime(compDate);
bool mItemDay = false;
bool dayTextChanged = false;
StringBuilder strTemp = new StringBuilder();
foreach (My_Date temp_dt in MyColllection)
{
if ("01/01/1900" != temp_dt.Cal_Date.ToShortDateString())
{
if (dayTextChanged == true)
{
break;
}
mItemDay = false;
DayVal = temp_dt.Cal_Date;
}
else
{
mItemDay = true;
}
if (e.Day.Date == Convert.ToDateTime(temp_dt.Cal_Date.ToString("d")))
{
switch (temp_dt.Cal_Type)
{
case "1" :
FontColor = "Blue";
break;
case "2":
FontColor = "Red";
break;
default:
FontColor = "Black";
break;
}
if (mItemDay == false)
{
strTemp = new StringBuilder();
}
else
{
strTemp.Append("<br>");
}
strTemp.Append("<span style='font-family:verdana;font-size:10px;font-weight:bold;color'");
strTemp.Append(FontColor);
strTemp.Append("'><br>");
strTemp.Append(temp_dt.Cal_Title.ToString());
strTemp.Append("</span>");
e.Cell.BackColor = System.Drawing.Color.Yellow;
dayTextChanged = true;
}
}
if (dayTextChanged == true)
{
e.Cell.Controls.Add(new LiteralControl(strTemp.ToString()));
}
}
}
So I need to display multiple Notes on same day...
So How can I do this??
Thanks in Advance....
Calendars are basically date pickers and using them to display data is one of the most common mistakes people make. Use a ListView to display your data/events; calendars were never meant for that.
At some stage the calendar cells are going to stretch as events are added for the same day, breaking the entire display. And if you try to set a limit, then people are going to complain and start asking why other events are listed and theirs aren't, etc.
In your code, you're basically swallowing the exception instead of handling it. Comment out the try-catch-finally (leave the Close()) and check what error you get then :)
Related
I'm working with two stored procedures in an ASP.NET button function. While I get an error message based on the results that the invoice number is already dispatched from the other stored procedure, it still moves to the other stored procedure and executes it.
If the user gets this error message:
This invoice num was already dispatched!
then it shouldn't move on to this aspect of the function
protected void Button2_Click(object sender, EventArgs e)
{
try
{
for (int i = GridView2.Rows.Count - 1; i >= 0; i--)
{
var row = GridView2.Rows[i];
CheckBox chk = row.FindControl("chkInvoice") as CheckBox;
//CheckBox chk = (CheckBox)GridView2.Rows[i].Cells[0].FindControl("CheckBox3");
if (chk != null && chk.Checked)
{
string strSQLconstring = System.Configuration.ConfigurationManager.ConnectionStrings["TWCL_OPERATIONSConnectionString"].ToString();
using (SqlConnection objConnection = new SqlConnection(strSQLconstring))
{
objConnection.Open();
using (SqlTransaction transaction = objConnection.BeginTransaction())
{
string SID = GridView2.Rows[i].Cells[3].Text.Trim();
SqlDataReader myReader = null;
using (SqlCommand command = new SqlCommand("PP_SelectStatus", objConnection, transaction))
{
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("#invoiceNum", SID);
command.Parameters.AddWithValue("#custPONum", GridView2.Rows[i].Cells[4].Text.Trim());
myReader = command.ExecuteReader();
if (myReader.Read())
{
string invoice1 = (myReader["status"].ToString());
if (invoice1 == "0")
{
ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('This invoice num was already dispatched!')", true);
}
myReader.Close();
}
}
else if (invoice1=="1")
{
using (SqlCommand cmd = new SqlCommand("PP_RemoveInvoice", objConnection, transaction))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#loadSheetNum", txtDispatchNum.Text);
cmd.Parameters.AddWithValue("#invoiceNum", SID);
cmd.Parameters.AddWithValue("#removeUser", lblUsername.Text.Replace("Welcome", ""));
**int a = cmd.ExecuteNonQuery();**
cmd.Dispose();
if (a > 0)
{
dt.Rows.RemoveAt(i);
////Read invoice qty from grid view 2
string invoice = GridView2.Rows[i].Cells[5].Text.ToString();
decimal invoiceTotal = Convert.ToDecimal(txtInvoiceTotal.Text) - Convert.ToDecimal(invoice);
txtInvoiceTotal.Text = invoiceTotal.ToString();
////Read invoice weight from grid view 2
string weight = GridView2.Rows[i].Cells[6].Text.ToString();
decimal invoiceWeight = Convert.ToDecimal(txtQtyWeight.Text) - Convert.ToDecimal(weight);
txtQtyWeight.Text = invoiceWeight.ToString();
lblError.ForeColor = Color.Green;
lblError.Text = "Selected record(s) successfully updated";
}
else
{
lblError.ForeColor = Color.Red;
lblError.Text = " Record has not yet been recorded";
}
}
//objConnection.Close();
transaction.Commit();
}
}
}
//Button2.Visible = false;
//showData();
GridView2.DataSource = dt;
GridView2.DataBind();
txtInvoiceCount.Text = dt.Rows.Count.ToString();
}
}
}
catch (Exception ex)
{
if (ex.Message.StartsWith("Violation of PRIMARY KEY constraint"))
{
lblError.ForeColor = Color.Red;
lblError.Text = " This invoice number was remove from dispatch sheet before!!";
}
else
{
// re-throw the error if you haven't handled it
lblError.Text = ex.Message;
throw;
}
}
}
You have a very, very simple logic error, but it is incredibly hard to see because your code is such a mess. Therefore, my answer is:
REFACTOR REFACTOR REFACTOR
It is important to get into the habit of writing short functions and controlling their inputs and outputs. If you don't do this, even a fairly trivial operation like this one gets very confusing and error-prone.
Here is an example of how to organize things. We remove most of the code from the click handler:
protected void DeleteButton_Click(object sender, EventArgs e)
{
for (int i = GridView2.Rows.Count - 1; i >= 0; i--)
{
var row = GridView2.Rows[i];
if (IsChecked(row))
{
var result = ProcessRow(row, i);
DisplayResult(i, result);
}
}
}
Firstly, notice it has a meaningful name. These become very important as your application grows. Also, look how short it is! Where did all the code go? Well, it went into two separate methods, which are now short enough for us to view on one page-- a common requirement that IT organizations impose on their programmers, to avoid spaghetti code.
protected TransactionResult ProcessRow(GridViewRow row, int index)
{
var SID = GridView2.Rows[index].Cells[3].Text.Trim();
var custPONum = GridView2.Rows[index].Cells[4].Text.Trim();
var loadSheetNum = txtDispatchNum.Text;
var removeUser = lblUsername.Text.Replace("Welcome", "");
return ExecuteInvoiceTransaction(SID, custPONum, loadSheetNum, removeUser);
}
And
public void DisplayResult(int rowIndex, TransactionResult result)
{
switch result
{
case TransactionResult.Success:
dt.Rows.RemoveAt(rowIndex);
DisplayTotals(rowIndex);
DisplaySuccess("Selected record(s) successfully updated");
break;
case TransactionResult.AlreadyDispatched;
ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('This invoice num was already dispatched!')", true);
break;
case TransactionResult.RecordNotRecorded;
DisplayError("Record has not yet been recorded");
break;
case TransactionResult.AlreadyRemoved:
DisplayError("This invoice number was remove from dispatch sheet before!!");
break;
}
}
These methods in turn call a variety of helper methods, each of which does one thing and one thing only. This could be referred to as separation of concerns, which is really important for structured code.
Here's the rest of the methods:
enum TransactionResult
{
Success,
AlreadyDispatched,
RecordNotRecorded,
AlreadyRemoved
}
private bool ExecuteSelectStatus(SqlConnection connection, SqlTransaction transaction, string invoiceNum, string custPONum)
{
using (SqlCommand command = new SqlCommand("PP_SelectStatus", objConnection, transaction))
{
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("#invoiceNum", invoiceNum);
command.Parameters.AddWithValue("#custPONum", custPONum);
using (var myReader = command.ExecuteReader())
{
if (myReader.Read())
{
string invoice1 = (myReader["status"].ToString());
if (invoice1 == "0")
{
return false;
}
}
}
return true;
}
}
private int ExecuteRemoveInvoice(SqlConnection objConnection, SqlTransaction transaction, string loadSheetNum, string invoiceNum, string removeUser)
{
try
{
using (SqlCommand cmd = new SqlCommand("PP_RemoveInvoice", objConnection, transaction))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#loadSheetNum", loadSheetNum);
cmd.Parameters.AddWithValue("#invoiceNum", invoiceNum);
cmd.Parameters.AddWithValue("#removeUser", removeUser);
return cmd.ExecuteNonQuery();
}
}
catch (SqlException ex)
{
if (ex.Number == 2627) //Primary key violation
{
return -1;
}
}
}
protected TransactionResult ExecuteInvoiceTransaction(string invoiceNum, string custPONum, string loadSheetNum, string removeUser)
{
var strSQLconstring = System.Configuration.ConfigurationManager.ConnectionStrings["TWCL_OPERATIONSConnectionString"].ToString();
using (SqlConnection objConnection = new SqlConnection(strSQLconstring))
{
objConnection.Open();
using (SqlTransaction transaction = objConnection.BeginTransaction())
{
var ok = ExecuteSelectStatus(objConnection, transaction, invoiceNum, custPONum);
if (!ok) return TransactionResult.AlreadyDispatched;
var a = ExecuteRemoveInvoice(objConnection, transaction, loadSheetNum, invoiceNum, removeUser);
switch a
{
case -1:
return TransactionResult.AlreadyRemoved;
case 0:
return TransactionResult.RecordNotRecorded;
default:
transaction.Commit();
return TransactionResult.Success;
}
}
}
}
public void DisplayTotals(int i)
{
////Read invoice qty from grid view 2
string invoice = GridView2.Rows[i].Cells[5].Text;
decimal invoiceTotal = Convert.ToDecimal(txtInvoiceTotal.Text) - Convert.ToDecimal(invoice);
txtInvoiceTotal.Text = invoiceTotal.ToString();
////Read invoice weight from grid view 2
string weight = GridView2.Rows[i].Cells[6].Text();
decimal invoiceWeight = Convert.ToDecimal(txtQtyWeight.Text) - Convert.ToDecimal(weight);
txtQtyWeight.Text = invoiceWeight.ToString();
}
public void DisplaySuccess(string message)
{
lblError.ForeColor = Color.Green;
lblError.Text = message;
}
public void DisplayError(string message)
{
lblError.ForeColor = Color.Red;
lblError.Text = message;
}
A few things to note:
You don't need to call Dispose() if you are using using.
You should always catch the most specific exception possible, per Microsoft's guidance. My example does this.
The exception handling for the primary key error is isolated into the method that calls the stored procedure. The overall business logic shouldn't have to know details about the SQL implementation. I've shown how you can identify the specific error based on this post.
Because there are four possible outcomes, I added an enumeration called TransactionResult so we could return the status to the caller easily.
Some of these methods are short-- just two lines-- and that is OK. The main reason to separate them out is to give them a meaningful name and make the code shorter and easier to read.
This code is much more structured but it could still be improved! In many implementations, the code that accesses the database is actually moved to a completely different layer or project.
See if this works. Moved your if/else together:
protected void Button2_Click(object sender, EventArgs e)
{
try
{
for (int i = GridView2.Rows.Count - 1; i >= 0; i--)
{
var row = GridView2.Rows[i];
CheckBox chk = row.FindControl("chkInvoice") as CheckBox;
if (chk != null && chk.Checked)
{
string strSQLconstring = System.Configuration.ConfigurationManager.ConnectionStrings["TWCL_OPERATIONSConnectionString"].ToString();
using (SqlConnection objConnection = new SqlConnection(strSQLconstring))
{
objConnection.Open();
using (SqlTransaction transaction = objConnection.BeginTransaction())
{
string SID = GridView2.Rows[i].Cells[3].Text.Trim();
SqlDataReader myReader = null;
using (SqlCommand command = new SqlCommand("PP_SelectStatus", objConnection, transaction))
{
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("#invoiceNum", SID);
command.Parameters.AddWithValue("#custPONum", GridView2.Rows[i].Cells[4].Text.Trim());
myReader = command.ExecuteReader();
if (myReader.Read())
{
string invoice1 = (myReader["status"].ToString());
if (invoice1 == "0")
{
ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('This invoice num was already dispatched!')", true);
}
else if (invoice1 == "1")
{
using (SqlCommand cmd = new SqlCommand("PP_RemoveInvoice", objConnection, transaction))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#loadSheetNum", txtDispatchNum.Text);
cmd.Parameters.AddWithValue("#invoiceNum", SID);
cmd.Parameters.AddWithValue("#removeUser", lblUsername.Text.Replace("Welcome", ""));
int a = cmd.ExecuteNonQuery();
cmd.Dispose();
if (a > 0)
{
dt.Rows.RemoveAt(i);
////Read invoice qty from grid view 2
string invoice = GridView2.Rows[i].Cells[5].Text.ToString();
decimal invoiceTotal = Convert.ToDecimal(txtInvoiceTotal.Text) - Convert.ToDecimal(invoice);
txtInvoiceTotal.Text = invoiceTotal.ToString();
////Read invoice weight from grid view 2
string weight = GridView2.Rows[i].Cells[6].Text.ToString();
decimal invoiceWeight = Convert.ToDecimal(txtQtyWeight.Text) - Convert.ToDecimal(weight);
txtQtyWeight.Text = invoiceWeight.ToString();
lblError.ForeColor = Color.Green;
lblError.Text = "Selected record(s) successfully updated";
}
else
{
lblError.ForeColor = Color.Red;
lblError.Text = " Record has not yet been recorded";
}
}
//objConnection.Close();
transaction.Commit();
}
}
}
GridView2.DataSource = dt;
GridView2.DataBind();
txtInvoiceCount.Text = dt.Rows.Count.ToString();
}
}
}
}
}
catch (Exception ex)
{
if (ex.Message.StartsWith("Violation of PRIMARY KEY constraint"))
{
lblError.ForeColor = Color.Red;
lblError.Text = " This invoice number was remove from dispatch sheet before!!";
}
else
{
// re-throw the error if you haven't handled it
lblError.Text = ex.Message;
throw;
}
}
}
}
I'm doing an app with Xamarin iOS.
I put a UITableView on XCode, so that when I click on a button, it retrieves from the database and slot it in. I'm able to put it onto a row, but couldn't figure it out how to have multiple rows of data in it. This is my partial code from which I'm able to display a row of data.
cmd.CommandType = CommandType.Text;
dr = cmd.ExecuteReader();
while (dr.Read())
{
var table = new UITableView(this.retrieveData.Frame);
string[] tableItems = new String[] {dr["admin_num"] + ", " + dr["name"]};
table.Source = new TableSource(tableItems);
Add (table);
}
You are creating a completely new TableView for each row in your data. Instead, you should loop through your data and create a data structure (List, array, etc) containing ALL of the data you want to display, and then pass that data to your TableView/Source.
cmd.CommandType = CommandType.Text;
dr = cmd.ExecuteReader();
// you will need a class mydata with Num and Name properties
List<mydata> data = new List<mydata>();
while (dr.Read())
{
data.Add(new mydata { Num = dr["admin_num"], Name = dr["name"] });
}
dr.Close();
var table = new UITableView(this.retrieveData.Frame);
table.Source = new TableSource(data);
Add (table);
What you need to do is this:
public List<DemoClass> getDemoClassList()
{
List<DemoClass> lstDemoClass;
DemoClass objDemoClass;
try
{
String strCommandText;
strCommandText = "SELECT * FROM DemoClass ";
command = new SqliteCommand(strCommandText, connection);
lstDemoClass = new List<DemoClass>();
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
objDemoClass = new Homes(false);
objDemoClass.ID = Convert.ToInt32(reader[0]);
objDemoClass.Name = Convert.ToString(reader[1]);
lstDemoClass.Add(objDemoClass);
}
}
return lstDemoClass;
}
catch (Exception ex)
{
throw ex;
}
finally
{
command.Dispose();
command = null;
lstDemoClass = null;
objDemoClass = null;
}
}
public void BindList()
{
List<DemoClass> lstDemoClass = new List<DemoClass>();
DemoClass hm = new DemoClass();
lstDemoClass = (List<DemoClass>)hm.getDemoClassList();
TableViewDataSource tdatasource = new TableViewDataSource(this, lstDemoClass);
table.Hidden = false;
table.DataSource = tdatasource;
table.Delegate = new TableViewDelegate(this, table, lstDemoClass);
table.ReloadData();
}
The getDemoClassList() will give the retrieved list from SQLite table, and later you can bind the list to the table datasource.
UPDATE:
As per your request I have updated my comment with the code for datasource and its delegate classes.
Now in this same class you need to add the following subclasses:
#region TableDelegate
public class TableViewDelegate : UITableViewDelegate
{
private DemoPageViewController _Controller;
private List<DemoClass> lst;
public TableViewDelegate(DemoPageViewController controller ,UITableView tableView, List<DemoClass> tblList)
{
try
{
this._Controller = controller;
this.lst = tblList;
}
catch(Exception ex)
{
}
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
try
{
//This loads the activity spinner till the selection code is completed
_Controller._loadPop = new LoadingOverlay (new System.Drawing.RectangleF(0,0,_Controller.View.Frame.Width,_Controller.View.Frame.Height),"Loading...");
_Controller.View.Add ( _Controller._loadPop );
// spin up a new thread to do some long running work using StartNew
Task.Factory.StartNew (
// tasks allow you to use the lambda syntax to pass work
() => {
InvokeOnMainThread(delegate{
DemoClass f = lst[indexPath.Row];
//Add your code here, usually some navigation or showing a popup
});
}).ContinueWith(t => InvokeOnMainThread(() => {
//Hide the activity spinner
_Controller._loadPop.Hide();
}));
}
catch(Exception ex)
{
}
finally
{
}
}
}
#endregion
#region TableDataSource
private class TableViewDataSource : UITableViewDataSource
{
static NSString kCellIdentifier = new NSString("MyIdentifier");
private List<DemoClass> lst;
private DemoPageViewController controller;
public TableViewDataSource (DemoPageViewController controller ,List<DemoClass> tblLst)
{
this.controller = controller;
this.lst = tblLst;
}
public override int NumberOfSections (UITableView tableView)
{
return 1;
}
public override int RowsInSection (UITableView tableView, int section)
{
return lst.Count;
}
// Override to support conditional editing of the table view.
public override bool CanEditRow (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)
{
// Return false if you do not want the specified item to be editable.
return false;
}
public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
{
try
{
UITableViewCell cell = tableView.DequeueReusableCell (kCellIdentifier);
if (cell == null)
{
cell = new UITableViewCell (UITableViewCellStyle.Subtitle, kCellIdentifier);
cell.Tag = Environment.TickCount;
}
DemoClass objDemo = lst[indexPath.Row];
cell.Accessory = UITableViewCellAccessory.DisclosureIndicator;
cell.ImageView.Image = UIImage.FromFile("Images/CameraImg.png");
cell.DetailTextLabel.Text = "Show some detail: " + objDemo.DemoDescription.ToString();
cell.TextLabel.Text = "Some Title: " + objDemo.DemoTitle.ToString();
return cell;
}
catch(Exception ex)
{
return null;
}
finally
{
}
}
}
#endregion
Hope it helps.
I have my first bigger asp.net website and there are userlists of all user online - of course this list is the same for every user, but as a normal online list I update this with PageMethod / WebMethod every 10 seconds.
So if 100 users online that means 10x6x100 = 6000 database querys each minute.
How can I avoid that?
Can I save this information for all user in something like a session / querystring / cookie but global for all users to avoid querys?
The Simplest way is to create an Application Variable or DataTable, which will hold your Required Information.
After each 10 minutes, when you update the records, Just update the Application Datatable you created above. This DataTable is common for all the users and that will decrease your load drastically.
Let me know if you need code.
You may us static variable for this. If you are having more than 1 app-pool to serverpages
then use asp.net caching since static variable are not thread safe.
Here is my code that i use for something similar it has 2 class.
class1
using System;
public class onlineuser
{
public string sessionid = "";
public string username = "";
public string currentpage = "";
public DateTime time = DateTime.Now;
public onlineuser()
{
//
// TODO: Add constructor logic here
//
}
}
class2
using System;
using System.Collections;
using System.Data;
public class user
{
public static ArrayList online;
public static void adduser(string sessionid,string username,string currentpage)
{
removeunused();
remove(sessionid);
onlineuser ou = new onlineuser();
ou.sessionid = sessionid;
ou.username = username;
ou.currentpage = currentpage;
ou.time = DateTime.Now;
if (online==null)
{
online = new ArrayList();
}
online.Add(ou);
online.TrimToSize();
}
public static void remove(string sessionid)
{
if (online==null)
{
return;
}
onlineuser ou = new onlineuser();
for (int i = 0; i < online.Count; i++)
{
ou = (onlineuser)online[i];
if (ou.sessionid == sessionid)
{
online.RemoveAt(i);
online.TrimToSize();
return;
}
}
}
public static void removeunused()
{
if (online == null)
{
return;
}
onlineuser ou = new onlineuser();
for (int i = 0; i < online.Count; i++)
{
ou = (onlineuser)online[i];
if (ou.time < DateTime.Now.AddMinutes(-2))
{
online.RemoveAt(i);
online.TrimToSize();
return;
}
}
}
public static DataTable totable()
{
DataTable dt = new DataTable();
DataColumn dc = new DataColumn("SessionId", typeof(string));
DataColumn dc1 = new DataColumn("UserName", typeof(string));
DataColumn dc2 = new DataColumn("currentpage", typeof(string));
DataColumn dc3 = new DataColumn("Time", typeof(DateTime));
dt.Columns.Add(dc);
dt.Columns.Add(dc1);
dt.Columns.Add(dc2);
dt.Columns.Add(dc3);
if (online!=null)
{
onlineuser ou = new onlineuser();
for (int i = 0; i < online.Count; i++)
{
ou = (onlineuser)online[i];
dt.Rows.Add(new object[] {ou.sessionid,ou.username,ou.currentpage,ou.time});
}
}
return dt;
}
}
following code is placed in mymaster page which update userlist
try
{
string uname= "N/A";
if (Session["uname"]!=null)
{
uname = Session["uname"].ToString();
}
string page = Path.GetFileName(Request.PhysicalPath).Trim().ToLower();
if (Request.QueryString!=null)
{
page += "?"+Request.QueryString.ToString();
}
user.adduser(Session.SessionID, uname, page);
}
catch (Exception)
{
}
I am having problems in retaining the string variable which I defined on the top of my scoop, everytime when page loads the string value becomes null. below is the snippet of the code:
public partial class Caravan_For_Sale : System.Web.UI.Page
{
string check;
PagedDataSource pds = new PagedDataSource(); //paging
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGrid();
}
}
private void BindGrid()
{
DataTable dt = null;
switch (check)
{
case "0-1500":
break;
case "1500-2000":
dt = caravans.GetFilterbyPrice1();
break;
case "2000+":
break;
default:
dt = caravans.GetAllCaravans();
break;
}
// DataTable dt = caravans.GetAllCaravans();
pds.DataSource = dt.DefaultView;
pds.AllowPaging = true;
pds.PageSize = 3;//add the page index when item exceeds 12 //Convert.ToInt16(ddlPageSize.SelectedValue);
pds.CurrentPageIndex = CurrentPage;
DataList1.RepeatColumns = 3; // 4 items per line
DataList1.RepeatDirection = RepeatDirection.Horizontal;
DataList1.DataSource = pds;
DataList1.DataBind();
lnkbtnNext.Enabled = !pds.IsLastPage;
lnkbtnPrevious.Enabled = !pds.IsFirstPage;
doPaging();
}
protected void lnkPrice2_Click(object sender, EventArgs e)
{
LinkButton _sender = (LinkButton)sender;
check = _sender.CommandArgument;
// items["test"] = test;
DataTable dt = caravans.GetFilterbyPrice2();
if (dt.Rows.Count < 3)
{
lnkbtnNext.Enabled = false;
lnkbtnPrevious.Enabled = false;
}
CurrentPage = 0;
BindGrid();
}
protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName.Equals("lnkbtnPaging"))
{
CurrentPage = Convert.ToInt16(e.CommandArgument.ToString());
BindGrid();
}
}
The string check becomes null everytime when the dlPaging_ItemCommand becomes active(page loads). Any help or suggestions will be appreciated
As far as I know, you have two options:
1) Load it again.
Not sure if it's possible in your case. This is usually done when dealing with database queries.
2) Put it in the ViewState just like this:
ViewState["check"] = check;
And load it after with this:
string check = Convert.ToString(ViewState["check"]);
Your class is instantiated on every load so it will not have a global variable from page view to page view. You will need to store it somehow. Like in the querystring or a session. You can also use the viewstate.
For example
ViewState("Variable") = "Your string"
Viewstate is the way to go, as the other people have answered. Whatever you do, please don't stuff it in the session.
I am trying to make a custom server control which inherits from DropDownList. I give the control an XML input containing some key/value pairs and my control shows them as a DropDownList.
I make the list items in the override Render method like this:
foreach (XElement child in root.Elements("Choice"))
{
string title = child.Element("Title").Value;
string score = child.Element("Score").Value;
item = new ListItem();
item.Text = title;
item.Value = score;
this.Items.Add(item);
}
The problem is that, when the user selects and item in the list, and the page posts back, the selected item is lost, and the list is re-initialized with the default data.
Does anyone have any idea how to keep the selected item, i.e. maintain the state?
Here is the complete source:
public class MultipleChoiceQuestionView2 : DropDownList
{
public MultipleChoiceQuestionView2() : base()
{
}
protected override void Render(HtmlTextWriter writer)
{
writer.RenderBeginTag(HtmlTextWriterTag.Table);
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
writer.RenderBeginTag(HtmlTextWriterTag.Td);
#region Parse Contets
if (!String.IsNullOrEmpty(this.Contents))
{
XElement root = XElement.Parse(this.Contents);
if (root.HasAttributes)
{
this.NoOfChoices = Int32.Parse(root.Attribute("ItemCount").Value);
}
this.Items.Clear();
this.Style.Add("width", "100px");
this.Style.Add("font-family", "Tahoma");
this.Items.Clear();
ListItem item = new ListItem();
item.Text = "";
item.Value = "0";
this.Items.Add(item);
foreach (XElement child in root.Elements("Choice"))
{
string title = child.Element("Title").Value;
string score = child.Element("Score").Value;
item = new ListItem();
item.Text = title;
item.Value = score;
this.Items.Add(item);
}
}
#endregion
base.Render(writer);
writer.RenderEndTag();
if (this.Required)
{
RequiredFieldValidator rfv = new RequiredFieldValidator();
rfv.ControlToValidate = this.ID;
rfv.InitialValue = "0";
rfv.Text = "*";
if (!String.IsNullOrEmpty(this.ValidationGroup))
{
rfv.ValidationGroup = this.ValidationGroup;
}
writer.RenderBeginTag(HtmlTextWriterTag.Td);
rfv.RenderControl(writer);
writer.RenderEndTag();
}
writer.RenderEndTag();
writer.RenderEndTag();
}
#region Properties
public string Contents
{
get
{
return ViewState["Contents"] == null ? "" : ViewState["Contents"].ToString();
}
set
{
ViewState["Contents"] = value;
}
}
private int mNoOfChoices;
public int NoOfChoices
{
get
{
return mNoOfChoices;
}
set
{
mNoOfChoices = value;
}
}
private string mValidationGroup;
public string ValidationGroup
{
get
{
return mValidationGroup;
}
set
{
mValidationGroup = value;
}
}
public string SelectedChoice
{
get
{
return "";
}
}
private bool mRequired = false;
public bool Required
{
get
{
return mRequired;
}
set
{
mRequired = value;
}
}
#endregion
}
Thanks in advance.
You've got two options: ViewState or ControlState.
The difference being ViewState can be overriden by setting EnableViewState="false" in the page directive, whilst ControlState cannot.
Essentially you need to hook into the state bag when you're getting/setting the values of the dropdown.
There's a decent example here where a custom control is derived from the Button class and maintains state between page requests - should fit your scenario nicely.
Hopefully that gets you started.