Dynamic Controls in asp.net

[Nilla2010]

I am having some issues in dynamically created controls. My scenario is when the user selects a dropdown values, it should dynamically create image buttons, where URL is from database. Then when the user click’s any one of the image, it should create the same image in the placeholder. The problem is when I give the on click event in the code behind its not working and I know it has to be initialized in Page init, but since the creation is based on Selectedindexchange, I don’t know how to proceed further. When I click the image, the page is post back and the images are gone. Please see my below code

protected void Selectedindex_loadObjTemp(object sender, System.EventArgs e)
{
 
    PlaceHolder PlaceHolder1 = new PlaceHolder();
 
      // Get the number of labels to create.
     String objTyoe = ddlObjTemp.SelectedValue;
     String strSQl = "select * from ObjectTemplates where type=" +    objTyoe;
     DataTable dt = FillDataTable(strSQl);
     Table addTable = new Table();   
 
     addTable.Controls.Clear();
     if (dt.Rows.Count > 0)
     {
 
        int datavount = 0;
         for (int i = 0; i <= datavount; i++)
             {
                 TableRow newRow = new TableRow();                  
 
                 for (int j = 0; j <= 3; j++)
                 {
                     TableCell newcell = new TableCell();
                     System.Web.UI.WebControls.ImageButton myImage = new System.Web.UI.WebControls.ImageButton();
                     myImage.ID = "imgv" + dt.Rows[datavount]["id"];
                     myImage.Attributes.Add("runat", "server");
                     switch (objTyoe)
                     {
                         case "1":
                             myImage.ImageUrl = "~/Images/streets/" + dt.Rows[datavount]["fileName"];
                             break;
                         case "2":
                             myImage.ImageUrl = "~/Images/Street Templates/" + dt.Rows[datavount]["fileName"];
 
                             break;
                         case "5":
                             myImage.ImageUrl = "~/Images/vehicles/" + dt.Rows[datavount]["fileName"];
                             break;
                         case "6":
                             myImage.ImageUrl = "~/Images/signs/" + dt.Rows[datavount]["fileName"];
 
                             break;
                         case "7":
                             myImage.ImageUrl = "~/Images/animals/" + dt.Rows[datavount]["fileName"];
 
                             break;
                         case "8":
                             myImage.ImageUrl = "~/Images/labels/" + dt.Rows[datavount]["fileName"];
                             break;
                         case "99":
                             myImage.ImageUrl = "~/Images/other/" + dt.Rows[datavount]["fileName"];
 
                             break;
 
                         case "9":
                             myImage.ImageUrl = "~/Images/ghosts/" + dt.Rows[datavount]["fileName"];
 
                             break;
                     }
 
 
                     Panel newpanel = new Panel();
                     newpanel.Controls.Add(myImage);
                     newcell.Controls.Add(newpanel);
                     myImage.Click += new System.Web.UI.ImageClickEventHandler(
this.btnCreate_Click);
 
                     datavount++;
                     newRow.Cells.Add(newcell);
                     if (datavount >= dt.Rows.Count)
                         break;
                 }
                 if (datavount >= dt.Rows.Count)
                     break;
                 addTable.Rows.Add(newRow);
 
             }
         mainPanel.Controls.Add(addTable);
 
}
}
private void btnCreate_Click(object sender, EventArgs e)
{
    showmsg(sender.ToString() + e.ToString());
 
}

Thanks

[Frinavale]

Store the number of image buttons created in a HiddenField. A HiddenField can be accessed in the Page Init event (using Request.Params("idOfHiddenField") to retrieve it). That way you can re-create the image buttons in the correct place, the Page Init event. Also be sure to specify the method that handles the image button click event in the Page Init event.

-Frinny

[Nilla2010]

Frinny ,
Thanks for your reply.Hiddenfiled didn't worked for and i used session variable and able to create in page_init.

Thanks again.

[Frinavale]

Session works too :)
It's a little trickier using the hidden field but I've got it to work in the past.

Glad you got it to work.

-Frinny