All controls are null within usercontrol

Question

I have a UserControl which uses a UserControl, among other controls.

In the ascx file I have the following code:

<%@ Register TagPrefix=         


        

Answer 1

I had this problem when I was adding a user control in the code behind the wrong way. You have to use the Page.LoadControl method to initialize the control you can't just use new.

        //WRONG
        UserControls.BingoCardPage bcp = new UserControls.BingoCardPage();
        form1.Controls.Add(bcp);
        //RIGHT
        UserControls.BingoCardPage bcp = (UserControls.BingoCardPage)Page.LoadControl("~/UserControls/BingoCardPage.ascx");
        form1.Controls.Add(bcp);