Programmatically Adding User Controls Inside An UpdatePanel

Question

I\'m having trouble dynamically adding controls inside an update panel with partial postbacks. I\'ve read many articles on dynamic controls and I understand how to add and m

Answer 1

I encountered the problem that using the method mentioned above, LoadUserControl() is called twice when handling an event. I've read through some other articles and would like to show you my modification:

1) Use LoadViewstate instead of Page_Load to load the user control:

protected override void LoadViewState(object savedState)
{
    base.LoadViewState(savedState);

    if (!string.IsNullOrEmpty(CurrentUserControl))
        LoadDataTypeEditorControl(CurrentUserControl, panelFVE);
}

2) Don't forget to set the control id when loading the usercontrol:

private void LoadDataTypeEditorControl(string userControlName, Control containerControl)
{
    using (UserControl myControl = (UserControl) LoadControl(userControlName))
    {
        containerControl.Controls.Clear();

        string userControlID = userControlName.Split('.')[0];
        myControl.ID = userControlID.Replace("/", "").Replace("~", "");
        containerControl.Controls.Add(myControl);
    }
    this.CurrentUserControl = userControlName;
}