In the above photo I have a table containing a list of users that are add dynamically in the table.
I want when I click on the red-cross image button the corresponding user to be deleted from the database.
Here is the code that fills the table:
/****** Filling the originators table ********/
string[] oa1 = originator;
for (int i = 0; i < oa1.Length; i++)
{
TableRow row = new TableRow();
users_table.Rows.Add(row);
for (int colCount = 0; colCount < 4; colCount++)
{
TableCell cell = new TableCell();
row.Cells.Add(cell);
if (colCount == 0)
{
cell.Controls.Add(new LiteralControl(oa1[i]));
}
else if (colCount == 1)
{
cell.Controls.Add(new LiteralControl("|"));
}
else if (colCount == 2)
{
LLKB userInfo = new LLKB();
cell.Controls.Add(new LiteralControl(userInfo.InfoGetter(oa1[i].Trim(), "name")));
}
else if (colCount == 3)
{
ImageButton btn = new ImageButton();
btn.ImageUrl = "img/DeleteRed.png";
btn.ID = oa1[i] + "_" + i;
btn.Click += new ImageClickEventHandler(delete_originator);
cell.Controls.Add(btn);
}
}
}
and here is the method that show do the deletion:
public void delete_originator(object sender, ImageClickEventArgs e)
{
//some code here
}
So, what do you suggest I write in the deletion method??
or if you have another idea...
you should empty table and recreate the table and get username thorugh spliting imagebutton ID
by '_',So in loop when that username come you add continue statement.
some thing like that in Delete event :
string Username=((imagebutton)sender).ID.toString().tosplit('_')[0];
Related
private void GridViewBind()
{
SqlConnection Dbcon = new SqlConnection();
Dbcon.ConnectionString = ConfigurationManager.ConnectionStrings[
"ConnectionString"].ConnectionString;
Dbcon.Open();
string expSql = "SELECT [dName],[item],[cnt] FROM [Test1].[dbo].[Test3]
ORDER BY [dName], [cnt] desc";
SqlDataAdapter adAdapter = new SqlDataAdapter(expSql, Dbcon);
DataSet ds = new DataSet();
adAdapter.Fill(ds);
GridView.DataSource = ds.Tables[0];
GridView.DataBind();
ViewState["dt"] = ds.Tables[0];
ViewState["sort"] = "Desc";
}
I drew a table using gridview(asp:gridview) And I made a db for test and bound it
Then, in order to merge cells with the same subject, cells were merged using OnDataBound.
I want to sort by merged subject when cnt is clicked
However, my sort code sorts the entire cnt column, and the merged cells are unraveled.
I need a way to keep the merged cells and do ASC/DESC sorting within them!
protected void OnDataBound(object sender, EventArgs e)
{
for (int i = GridView2.Rows.Count - 1; i > 0; i--)
{
GridViewRow row = GridView2.Rows[i];
GridViewRow previousRow = GridView2.Rows[i - 1];
int j = 0;
if (row.Cells[j].Text == previousRow.Cells[j].Text)
{
if (previousRow.Cells[j].RowSpan == 0)
{
if (row.Cells[j].RowSpan == 0)
{
previousRow.Cells[j].RowSpan += 2;
}
else
{
previousRow.Cells[j].RowSpan = row.Cells[j].RowSpan + 1;
}
row.Cells[j].Visible = false;
}
}
}
}
I don't have reputation to comment, so i comment here in answer.
Can you add your OnDataBound code where your merged subject?
Also can you make your select query with merged subject as column, then you just need to bind data directly to gridview.
For sorting you can follow below link:
https://www.c-sharpcorner.com/UploadFile/b8e86c/paging-and-sorting-in-Asp-Net-gridview/
https://codepedia.info/gridview-sorting-header-click
I have this code which generates TextBoxes in a Table dynamically, I got it from a website:
protected void AddStdBtn_Click(object sender, EventArgs e)
{
CreateDynamicTable();
}
private void CreateDynamicTable()
{
// Fetch the number of Rows and Columns for the table
// using the properties
if (ViewState["Stu"] != null)
Students = (DataTable)ViewState["Stu"];
int tblCols = 1;
int tblRows = Int32.Parse(NoTxt.Text);
// Now iterate through the table and add your controls
for (int i = 0; i < tblRows; i++)
{
TableRow tr = new TableRow();
for (int j = 0; j < tblCols; j++)
{
TableCell tc = new TableCell();
TextBox txtBox = new TextBox();
txtBox.ID = "txt-" + i.ToString() + "-" + j.ToString();
txtBox.Text = "RowNo:" + i + " " + "ColumnNo:" + " " + j;
// Add the control to the TableCell
tc.Controls.Add(txtBox);
// Add the TableCell to the TableRow
tr.Cells.Add(tc);
}
// Add the TableRow to the Table
tbl.Rows.Add(tr);
tbl.EnableViewState = true;
ViewState["tbl"] = true;
}
}
protected void CalculateBtn_Click(object sender, EventArgs e)
{
foreach (TableRow tr in tbl.Controls)
{
foreach (TableCell tc in tr.Controls)
{
if (tc.Controls[0] is TextBox)
{
Response.Write(((TextBox)tc.Controls[0]).Text);
}
}
Response.Write("<br/>");
}
}
protected override object SaveViewState()
{
object[] newViewState = new object[2];
List<string> txtValues = new List<string>();
foreach (TableRow row in tbl.Controls)
{
foreach (TableCell cell in row.Controls)
{
if (cell.Controls[0] is TextBox)
{
txtValues.Add(((TextBox)cell.Controls[0]).Text);
}
}
}
newViewState[0] = txtValues.ToArray();
newViewState[1] = base.SaveViewState();
return newViewState;
}
protected override void LoadViewState(object savedState)
{
//if we can identify the custom view state as defined in the override for SaveViewState
if (savedState is object[] && ((object[])savedState).Length == 2 && ((object[])savedState)[0] is string[])
{
object[] newViewState = (object[])savedState;
string[] txtValues = (string[])(newViewState[0]);
if (ViewState["Stu"] != null)
Students = (DataTable)ViewState["Stu"];
if (txtValues.Length > 0)
{
//re-load tables
CreateDynamicTable();
int i = 0;
foreach (TableRow row in tbl.Controls)
{
foreach (TableCell cell in row.Controls)
{
if (cell.Controls[0] is TextBox && i < txtValues.Length)
{
((TextBox)cell.Controls[0]).Text = txtValues[i++].ToString();
}
}
}
}
//load the ViewState normally
base.LoadViewState(newViewState[1]);
}
else
{
base.LoadViewState(savedState);
}
}
Now if you examine CreateDynamicTable() function, particularly the line:
int tblRows = Int32.Parse(NoTxt.Text);
you can see that the user can control the number of rows by entering a number in the TextBox NoTxt. When I run this code I get the following error:
An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in user code
Additional information: Input string was not in a correct format.
and the error location is in the same line above.
The question is: How can I let the user control the number of rows in the table?
After few days of reading and research, the solution can be done by using Session variables. Store the value obtained in NoTxt.Text as follows for example:
Session["V"] = Int32.Parse(NoTxt.Text);
and retrieve it once you need it.
my datatable formed as follows
DataTable dtFinalData = new DataTable();
//Adding columns for BR details
dtFinalData.Columns.Add("SupId", typeof(string));
dtFinalData.Columns.Add("SupName", typeof(string));
DateTime dt = DateTime.Today;
int num = DateTime.DaysInMonth(DateTime.Today.Year, DateTime.Today.Month);
//--> adding columns for date part (1-31)
for (int i = 1; i < num + 1; i++)
{
dtFinalData.Columns.Add(i.ToString(), typeof(bool));
}
//<-- adding columns for date part (1-31)
#endregion
#region Fill dtFinalData
//--> Looping each BR from tblBrList
foreach (DataRow BrRow in dtBrList.Rows)
{
DataRow dr = dtFinalData.NewRow();
int SupId = Convert.ToInt32(BrRow[0]); //retrieve BR ID from dtBrList
String supName = BrRow[1].ToString(); //retreive Supervisor name from dtBrList
dr["SupId"] = SupId.ToString();
dr["SupName"] = supName;
for (int i = 1; i < num + 1; i++)
{
DateTime dtRunningDate = new DateTime(2013, 5, i);
//select BR_SUP_CODE,
DataRow[] drAttendance = dtAttendance.Select("BR_SUP_CODE=" + SupId + " AND SMS_DATE=#" + dtRunningDate + "#", string.Empty);
if (drAttendance.Length == 1)
{
//CheckBox chkbx = new CheckBox();
//chkbx.Checked = true;
dr[i.ToString()] = true;
}
else
{
//CheckBox chkbx = new CheckBox();
//chkbx.Checked = false;
dr[i.ToString()] = false;
}
}
dtFinalData.Rows.Add(dr);
}
//<-- Looping each BR from tblBrList
#endregion
GridView1.DataSource = dtFinalData;
GridView1.DataBind();
Now i want to add checked image in place of true and unchecked image in place of false.how to bind grid view dynamically such that in place of disable check box i want to insert two types of image?
Your DataTable part is fine and continue to add the True/False text as per the logic. Now you should handle the GridView part. So, define an event handler for the OnRowDataBound event of GridView.
In this event only, check for the Text property of the cells, and if True/False, clear the cells and add the required image.
<asp:GridView ID="GridView1" OnRowDataBound="GridView1_RowDataBound" ... />
And your event handler will have code as below:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
Image chkImage = new Image();
chkImage.ImageUrl="~/images/Checked.png";
Image UnchkImage = new Image();
UnchkImage.ImageUrl = "~/images/UnChecked.png";
if (e.Row.RowType == DataControlRowType.DataRow)
{
// We will start from 3rd cell because the first 2 cells are
// for SupID & SupName, where we don't need to place images
for (int cellIndex = 2; cellIndex < GridView1.Columns.Count; cells++)
{
// Add Checked Image when cell text is true
if (e.Row.Cells[cellIndex].Text == "true")
{
// clear the cell and add only the image
e.Row.Cells[cellIndex].Controls.Clear();
e.Row.Cells[cellIndex].Controls.Add(chkImage);
}
// Add Unchecked Image when cell text is false
if (e.Row.Cells[cellIndex].Text == "false")
{
// clear the cell and add only the image
e.Row.Cells[cellIndex].Controls.Clear();
e.Row.Cells[cellIndex].Controls.Add(unchkImage);
}
}
}
}
I have a form with 3 wizard steps, and when i click the button to dynamically add text boxes, that works fine, but when i go to the next step and i click on add to add more text boxes, it automatically adds all the text boxes from the previous steps and then continues to add if i keep click on it.
How do i prevent that from happening.
private List ControlsList
{
get
{
if (ViewState["controls"] == null)
{
ViewState["controls"] = new List();
}
return (List)ViewState["controls"];
}
}
private int NextID
{
get
{
return ControlsList.Count + 1;
}
}
protected override void LoadViewState(object savedState)
{
string section = Wizard1.ActiveStep.ID;
int sectionNum = Wizard1.ActiveStepIndex;
var control = Wizard1.ActiveStep.FindControl("Place" + sectionNum) as PlaceHolder;
base.LoadViewState(savedState);
int count = 0;
foreach (string txtID in ControlsList)
{
if (count == 0)
{
control.Controls.Add(new LiteralControl("<tr>"));
}
TextBox txt = new TextBox();
control.Controls.Add(new LiteralControl("<td>"));
txt.ID = txtID;
control.Controls.Add(txt);
control.Controls.Add(new LiteralControl("</td>"));
count = count + 1;
if (count == 3)
{
control.Controls.Add(new LiteralControl("</tr>"));
count = 0;
}
}
}
protected void AddControlButton_Click(object sender, EventArgs e)
{
string section = Wizard1.ActiveStep.ID;
int sectionNum = Wizard1.ActiveStepIndex;
var control = Wizard1.ActiveStep.FindControl("Place" + sectionNum) as PlaceHolder;
TextBox txt1 = new TextBox();
TextBox txt2 = new TextBox();
TextBox txt3 = new TextBox();
txt1.ID = section.ToString() + "Size" + NextID.ToString();
control.Controls.Add(new LiteralControl("<td>"));
control.Controls.Add(txt1);
control.Controls.Add(new LiteralControl("</td>"));
ControlsList.Add(txt1.ID);
txt2.ID = section.ToString() + "Description" + NextID.ToString();
control.Controls.Add(new LiteralControl("<td>"));
control.Controls.Add(txt2);
control.Controls.Add(new LiteralControl("</td>"));
ControlsList.Add(txt2.ID);
txt3.ID = section.ToString() + "Quantity" + NextID.ToString();
control.Controls.Add(new LiteralControl("<td>"));
control.Controls.Add(txt3);
control.Controls.Add(new LiteralControl("</td></tr>"));
ControlsList.Add(txt3.ID);
}
You are storing all of the dynamic textboxes in ViewState and then the ControlsList property getter is returning the whole list when it is building the textboxes.
My recommendation is to use Session cache instead of ViewState, because it will allow you to differentiate the textbox controls from each of the wizard steps, like this:
Session["WizardStep1"] = listOfTextBoxesFromStep1;
Session["WizardStep2"] = listOfTextBoxesFromStep2;
Session["WizardStep3"] = listOfTextBoxesFromStep3;
Edit: if someone could also suggest a more sensible way to make what I'm trying below to happen, that would also be very appreciated
I'm building an multiPage form that takes a quantity (of product) from a POST method, and displays a form sequence relying on that number. when the user goes to the next page, the form is supposed to collect this information and display it (for confirmation), which will then send this info to a service that will supply URL's to display.
Needless to say, I'm having problems making this work. Here is the relevant parts of my (anonymised) code:
public partial class foo : System.Web.UI.Page
{
Int quantityParam = 3;
ArrayList Users = new ArrayList();
//the information for each user is held in a hashtable the array list will be an array list of the user hashtables
protected void Page_Init(object sender, EventArgs e)
{
if(null != Request["quantity1"])
{
this.quantityParam = Request["quantity1"];
}
}
protected void Page_Load(object sender, EventArgs e)
{
int quantity = this.quantityParam;
if(quantity < 1){ mviewThankYou.SetActiveView(View4Error);}
else
{ //create a form for each user
mviewThankYou.SetActiveView(View1EnterUsers);
for(int user = 0;user < quantity; user++)
{
createUserForm(user);
}
}
}
protected void BtnNext1_Click(object sender, EventArgs e)
{
if(Page.IsValid)
{
for(int i = 0; i < quantity; i++)
{
String ctrlName = "txtUser" + i.ToString();
String ctrlEmail = "txtEmail" + i.ToString();
TextBox name = (TextBox)FindControl(ctrlName);
TextBox email = (TextBox)FindControl(ctrlEmail);
/*BONUS QUESTION: How can I add the Hashtables to the Users Array without them being destroyed when I leave the function scope?
this is where the failure occurs:
System.NullReferenceException: Object reference not set to an instance of an object. on: "tempUser.Add("name",name.Text);
*/
Hashtable tempUser = new Hashtable();
tempUser.Add("name",name.Text);
tempUser.Add("email",email.Text);
this.Users.Add(tempUser);
}
for(int i = 0; i < quantity; i++)
{
v2Content.Text +="<table><tr><td>Name: </td><td>"+
((Hashtable)Users[i])["name"]+
"</td></tr><tr><td>Email:</td><td>"+
((Hashtable)Users[i])["email"]+
"</td></tr></table>";
}
mviewThankYou.SetActiveView(View2Confirm);
}
}
private void createUserForm(int userNum){
DataTable objDT = new DataTable();
int rows = 2;
int cols = 2;
//create the title row..
TableRow title = new TableRow();
TableCell titleCell = new TableCell();
formTable.Rows.Add(title);
Label lblUser = new Label();
lblUser.Text = "<b>User "+ (userNum+1) + "</b>";
lblUser.ID = "lblTitle"+ userNum;
titleCell.Controls.Add(lblUser);
title.Cells.Add(titleCell);
for(int i = 0; i < rows; i++)
{
TableRow tRow = new TableRow();
formTable.Rows.Add(tRow);
for(int j = 0; j < cols; j++)
{
TableCell tCell = new TableCell();
if(j == 0){
Label lblTitle = new Label();
if(i == 0){
lblTitle.Text = "User Name:";
lblTitle.ID = "lblUser" + userNum;
}
else{
lblTitle.Text = "User Email:";
lblTitle.ID = "lblEmail" + userNum;
}
tCell.Controls.Add(lblTitle);
} else {
TextBox txt = new TextBox();
if(i==0){
txt.ID = "txtUser" + userNum;
}
else{
txt.ID = "txtEmail" + userNum;
}
RequiredFieldValidator val = new RequiredFieldValidator();
val.ID = txt.ID + "Validator";
val.ControlToValidate = txt.UniqueID;
val.ErrorMessage = "(required)";
tCell.Controls.Add(txt);
tCell.Controls.Add(val);
}
tRow.Cells.Add(tCell);
}//for(j)
}//for(i)
//create a blank row...
TableRow blank = new TableRow();
TableCell blankCell = new TableCell();
formTable.Rows.Add(blank);
Label blankLabel = new Label();
blankLabel.Text = " ";
blankLabel.ID = "blank" + userNum;
blankCell.Controls.Add(blankLabel);
blank.Cells.Add(blankCell);
}//CreateUserForm(int)
Sorry for the gnarly amount of (amateur code). What I suspect if failing is that FindControl() is not working, but I can't figure out why...
if any help can be given, I'd be very greatful.
Edit: showing the error might help:
Error (Line 112)
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 111: Hashtable tempUser = new Hashtable();
Line 112: tempUser.Add("name",name.Text);
Line 113: tempUser.Add("email",email.Text);
Line 114: this.Users.Add(tempUser);
You problem comes in the fact you are reloading the form every time in Page_Load. Make sure you only load the dynamic text boxes once and you will be able to find them when you need them for confirmation. As long as Page_Load rebuilds, you will not find the answer, and risk not finding anything.
I figured it out:
FindControl() works as a direct search of the children of the control it's called on.
when I was calling it, it was (automatically) Page.FindControl() I had nested the table creation inside a field and a Table control
when I called tableID.FindControl() it found the controls just as it should.
Thanks for the help, Gregory, and for all the comments everyone.
-Matt