.net development dynamically created controls need their own methods

Question

Hello everyone,

I'm sure that almost everyone programming in .net has ran into similar issues with the dynamic creation of buttons..

Example scenario..

I have a gridview and in one of the gridview fields I have a button. Normally in .net using visual studio you can easily grab the click event of the button, however since these buttons are dynamically created they're not as easy to grab. I was curious to what the best method for grabbing the button's click event would be.

I understand its possible using dopostback; however, I'm not sure how to implement it nor have I tried because I have also read dopostback method is not a very good one to use. Why is that?

Answer 1

In the gridview, there is an event called RowDatabound. Put an event handler on that:

gv.RowDataBound += new EventHandler(rowBound);

Now inside that function, you'll use FindControl to locate the button and add a handler:

function rowbound(Object sender, GridViewRowEventArgs e)
{
  if(e.Row.RowType == DataControlRowType.DataRow)
  {
   var b = e.Row.FindControl("btn") as Button;
   b.Click += new EventHandler(handleBtnClick);
  }
}

Answer 2

During the ItemCreated event of the Gridview use FindControl to get a reference to the button and attach the event handler there. ie. btn.Click += Somehandler;

Answer 3

Sadly, the answer was much simpler than I ever thought..

I didn't realize that the ItemCommand event was usable for buttons created in a TemplateField.

All I really had to do was..

Private Sub GridView1_ItemCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewCommandEventArgs) Handles DetailsView1.ItemCommand
    If e.CommandName = "myButton" Then
        //'myButton press event logic here
    End If
End Sub

Thanks for your help guys.. I really appreciate it. Your answers will be helpful in the future I'm sure.