I am using Visual studio and have the following page_load function on my Default.aspx web form:
if (IsPostBack == false)
{
//Display all records on the form load
DisplayCars("");
I have a user, where I can get their username (which I have used to add as the "Creator" of the specific data record). I want to use this username to only display cars where the username = ACar.Creator
How would I go about doing this? I have everything setup in order to do this.
I need something like the following:
if (User.Identity.Name == ACar.Creator) {
show this record
}
But I do not know the syntax for this within aspx/sql
Thanks
You should actually do this in the database by passing username
public DataTable GetUserRecord(string userName)
{
DataTable dt = new DataTable();
SqlConnection conn = new SqlConnection("connection string to database");
using(conn)
{
string sql = "SELECT car.CarName, car.Model FROM car WHERE car.Creator = #UserName";
SqlCommand comm = new SqlCommand(sql, conn);
comm.Parameters.AddWithValue("#UserName", userName);
dt.Load(comm.ExecuteReader());
}
return dt;
}
From your page
protected void Page_Load(object sender, Eventargs e)
{
DataTable dt = GetUserRecord(User.Identity.Name);
if(dt.Rows.Count > 0)
{
string firstRowCarName = dt.Rows[0]["CarName"];
//etc
}
}
Related
I have a web form page that I am going to query the data from database via selecting different values from dropdown list, after I selected proper value, in the description I want to update the database record while I click the submit button, for example, customer name, and status, there will be only one record coming back and the description will show(I can do it in isPostback and query the database, using SQL DataReader and then call related index element to get it) but when I typed something in the description and click submit, it won't update in the database, but if I don't use if(isPostback) it is working.
P.S. if there is no if(ispostback) case block there,dataUpdate.Update() works well.
So my question is;
protected void btnSubmit_Click(object sender, EventArgs e)
{
dataUpdate.Update();
}
The page_load code:
protected void Page_Load(object sender, EventArgs e)
{
ValidationSettings.UnobtrusiveValidationMode = UnobtrusiveValidationMode.None;
if (!IsPostBack)
{
SqlConnection conn1 = new SqlConnection(cxInfo.ConnectionString);
string userInfoQuery1 = "select * from users where id=#id";
SqlCommand userInfo1 = new SqlCommand(userInfoQuery1, conn1);
userInfo1.Parameters.AddWithValue("#id", dropdlCx.SelectedValue);
conn1.Open();
SqlDataReader reader1 = userInfo1.ExecuteReader();
reader1.Read();
if (reader1.HasRows )
{
lblCxId.Text = "" + reader1[0];
SqlConnection conn = new SqlConnection(dataUpdate.ConnectionString);
string userInfoQuery = "select cx_first_name+',' + cx_last_name as 'name',cx_id ,incident_id,description,contact_method from incident where cx_id=#id and status=#status";
SqlCommand userInfo = new SqlCommand(userInfoQuery, conn);
userInfo.Parameters.AddWithValue("#id", lblCxId.Text);
userInfo.Parameters.AddWithValue("#status", dropStatus.SelectedValue);
conn.Open();
SqlDataReader reader = userInfo.ExecuteReader();
reader.Read();
if (reader.HasRows)
{
lblCxId.Text = "" + reader1[0];
txtDesc.Text = (string)reader[3];
radioContact.SelectedValue = (string)reader[4];
desc= (string)reader[3];
}
conn.Close();
}
conn1.Close();
}
if (IsPostBack)
{
lblCxId.Text = dropdlCx.SelectedValue;
/*I want to have txtDesc.txt= database query here, but as long as I add the code here, then the update won't work*/
}
}
So I think there only thing I got stuck is how to let the system know that what I submit is not the thing that he is going to refresh, please accept my value instead of the refresh?
I have an asp.net project that I am trying to insert words one by one out of text into my SQL Server database. Insert works well however I would like to filter some words
and delete from database by using table named filter that I have already created.
But for this part (filtering) of my code, I get an error
The connection string property has not been initialized
Code:
public partial class Home : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["TextConnectionString"].ConnectionString);
protected void Button1_Click(object sender, EventArgs e)
{
using (con) {
con.Open();
foreach (var item in results) { // here trying to insert word its id and some other information but for now they can stay null(yes,null allowed for them)
id++;
string w = item.Word.ToString();
SqlCommand cmd = con.CreateCommand();
cmd.Parameters.AddWithValue("#id", id);
cmd.Parameters.AddWithValue("#word", item.Word);
cmd.CommandText= "INSERT INTO word(id, word, sid, frequency, weight, f) VALUES (#id, #word, 0, 0, 0, 0) ";
cmd.ExecuteNonQuery();
}
con.Close();
}
using (con)
{
con.Open();
SqlCommand cmf = con.CreateCommand();
cmf.CommandText = "delete from word where word.word in (select filter.word from filter)";
cmf.ExecuteNonQuery();
}
con.Close();
}
}
}
I want to login automatically after registration by using a session like Session["ud"] , but I don't know where should I put it.
public partial class index : System.Web.UI.Page
{
SqlConnection cnn = new SqlConnection(ConfigurationManager.AppSettings["dbpath"]);
protected void btnSave_Click(object sender, EventArgs e)
{
long idx;
SqlCommand cmd = new SqlCommand();
cmd.Connection = cnn;
cmd.CommandText = "Insert into tblUser (UInfo,UEmail,UName,UPass, UGender) Values (#P1,#P2,#P3,#P4,#P5) select ##Identity";
cmd.Parameters.AddWithValue("#P1", txtInfo.Text);
cmd.Parameters.AddWithValue("#P2", txtEmail.Text);
cmd.Parameters.AddWithValue("#P3", txtUserName.Text);
cmd.Parameters.AddWithValue("#P4", txtPass.Text);
cmd.Parameters.AddWithValue("#P5", rdbMale.Checked);
cnn.Open();
idx = Convert.ToInt64(cmd.ExecuteScalar()); // i think here we can do something
cnn.Close();
here we want to upload the image of user and it works correctly
string fn = "";
if (FileUpload1.HasFile == true)
{
fn = FileUpload1.FileName;
string des = Server.MapPath("\\UserImg\\") + idx.ToString() + ".jpg";
FileUpload1.PostedFile.SaveAs(des);
SqlCommand cmdUpdate = new SqlCommand();
cmdUpdate.Connection = cnn;
cmdUpdate.CommandText = "Update tblUser Set UImg=#P5 where UId=#P0";
cmdUpdate.Parameters.AddWithValue("#P5", idx.ToString() + ".jpg");
cmdUpdate.Parameters.AddWithValue("#P0", idx);
cnn.Open();
cmdUpdate.ExecuteNonQuery();
cnn.Close();
}
Response.Redirect("Profile.aspx");
}
}
once you have entered data into in sql database you will get id of new user here
idx = Convert.ToInt64(cmd.ExecuteScalar()); // i think here we can do something
Once you get the id assign it to your session
idx = Convert.ToInt64(cmd.ExecuteScalar()); // i think here we can do something
cnn.Close();
Session["ud"]=idx;
once you have assigned session ,you just have to redirect to required page and validate Session variable if it's null or not.
i hope on Profile.aspx page you are checking for same session variable.
Profile.aspx.cs--on page load
if (Session["ud"] != null)
{
//successfull login
}
else
{
//redirect to login page
}
I need to use a the session dataTable email value for the #email and the base from the dropdownlist.
protected void Page_Load(object sender, EventArgs e)
{
DropDownList1.DataSource = (DataTable)Session["dt"];
DropDownList1.DataValueField = "base";
DropDownList1.DataTextField = "base";
DropDownList1.DataBind();
}
string str;
protected void Submit_Click(object sender, EventArgs e)
{
if (CheckBox9.Checked == true)
{
str = str + CheckBox9.Text + "x";
}
}
SqlConnection con = new SqlConnection(...);
String sql = "UPDATE INQUIRY2 set Question1 = #str WHERE email = #email AND Base = #base;";
con.Open();
SqlCommand cmd = new SqlCommand(sql, con);
cmd.Parameters.AddWithValue("#email", Session.dt.email);
cmd.Parameters.AddWithValue("#str", str);
cmd.Parameters.AddWithValue("#base", DropDownList1.base);
}
}
Your syntax for reading the value out of Session is wrong, you cannot use Session.dt.email.
You need to read the DataTable out of Session and cast it to a DataTable, like this:
DataTable theDataTable = null;
// Verify that dt is actually in session before trying to get it
if(Session["dt"] != null)
{
theDataTable = Session["dt"] as DataTable;
}
string email;
// Verify that the data table is not null
if(theDataTable != null)
{
email = dataTable.Rows[0]["Email"].ToString();
}
Now you can use the email string value in your SQL command parameters, like this:
cmd.Parameters.AddWithValue("#email", email);
UPDATE:
You will want to wrap your drop down list binding in Page_Load with a check for IsPostBack, because as your code is posted it will bind the drop down list every time the page loads, not just the first time, thus destroying whatever selection the user made.
Instead do this:
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
DropDownList1.DataSource = (DataTable)Session["dt"];
DropDownList1.DataValueField = "base";
DropDownList1.DataTextField = "base";
DropDownList1.DataBind();
}
}
Now your base value in your database parameter logic should be the value the user selected.
I have been given some c# code and have been asked to create a markup (.aspx) file that would go along with it.
I am not asking for help to write the code, but instead, how to go about it.
Here is the code:
public partial class search : Page
{
protected override void OnLoad(EventArgs e)
{
int defaultCategory;
try
{
defaultCategory = Int32.Parse(Request.QueryString["CategoryId"]);
}
catch (Exception ex)
{
defaultCategory = -1;
}
Results.DataSource = GetResults(defaultCategory);
Results.DataBind();
if (!Page.IsPostBack)
{
CategoryList.DataSource = GetCategories();
CategoryList.DataTextField = "Name";
CategoryList.DataValueField = "Id";
CategoryList.DataBind();
CategoryList.Items.Insert(0, new ListItem("All", "-1"));
CategoryList.SelectedIndex = CategoryList.Items.IndexOf(CategoryList.Items.FindByValue(defaultCategory.ToString()));
base.OnLoad(e);
}
}
private void Search_Click(object sender, EventArgs e)
{
Results.DataSource = GetResults(Convert.ToInt32(CategoryList.SelectedValue));
Results.DataBind();
}
private DataTable GetCategories()
{
if (Cache["AllCategories"] != null)
{
return (DataTable) Cache["AllCategories"];
}
SqlConnection connection = new SqlConnection("Data Source=DB;Initial Catalog=Store;User Id=User;Password=PW;");
string sql = string.Format("SELECT * From Categories");
SqlCommand command = new SqlCommand(sql, connection);
SqlDataAdapter da = new SqlDataAdapter(command);
DataTable dt = new DataTable();
da.Fill(dt);
Cache.Insert("AllCategories", dt, null, DateTime.Now.AddHours(1), System.Web.Caching.Cache.NoSlidingExpiration);
connection.Dispose();
return dt;
}
private DataTable GetResults(int categoryId)
{
SqlConnection connection = new SqlConnection("Data Source=DB;Initial Catalog=Store;User Id=User;Password=PW;");
string sql = string.Format("SELECT * FROM Products P INNER JOIN Categories C on P.CategoryId = C.Id WHERE C.Id = {0} OR {0} = -1", categoryId);
SqlCommand command = new SqlCommand(sql, connection);
SqlDataAdapter da = new SqlDataAdapter(command);
DataTable dt = new DataTable();
da.Fill(dt);
connection.Dispose();
return dt;
}
}
EDIT
In the above code, what is the Results object and is the CategoryList just a listbox?
As Nilesh said this seems like a search page, You can possibly try creating the a Webform using Visual studio which is just drag and drop controls into canvas and that will create the mark up for the controls in the code window.
This code behind seems to be doing the following,
On page load at Get request (when its !Page.IsPostBack) page is going to get categories using GetCategories() and fill the drop down list "CategoryList" with all category names (default selected one being the defaultcategory ID from query string).
The search button takes the dropdown's selected value and calls the GetResults() to get data table to fill the grid view "Results". So you need 3 controls (Dropdown list, Button, Gridview) in the webform with these names..