How to change asp button ID using C# code

Question

I am creating a table dynamically using c# and I am adding buttons to each cells. I need to assign button IDs for each of them so I can identify them later. I used following code for that.

bt.ID = rowIndex + c.ToString();   //bt.ID = "newID";

But when I try to access this button later it gives me an error.

Button seatButton = (Button)this.FindControl("a1");
seatButton.BackColor = Color.Red;   //Gives an error here
seatButton.Enabled = false;         //Gives an error here

I think the problem is with changing the button ID. I need to know the reason of this error and the cure..

See: stackoverflow.com/questions/9830198/find-control-in-page , I think this will help — Robert Noack
– Robert Noack, Commented Sep 8, 2013 at 7:05

R.C · Accepted Answer · 2013-09-10 01:08:53Z

Here your seatButton must be null from the statement:

Button seatButton = (Button)this.FindControl("a1");

Rather than just doing this.FindControl , you can look for the placeholder of your control first and then get the button control, or search recursively through all the page controls.

Method I: Using ContentPlaceHolder way.

ContentPlaceHolder contentPH = (ContentPlaceHolder)this.Master.FindControl("MyContentPlaceHolder");
 Button seatButton = (Button)contentPH.FindControl("a1");

Method II:: Search recursively through the page controls.

Call getControl method once from appropriate part of your code

GetControl(Page.Controls);

// and method looks like:

private void GetControl( ControlCollection controls )
{
  foreach (Control ctrl in controls)
{
     if(ctrl.ID == "a1")
    {
       seatButton = (Button)ctrl;
    }

     if( ctrl.Controls != null)
     // call recursively this method to search nested control for the button 
     GetControl(ctrl.Controls);    
}

}

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