Question

We are using asp .Net with C#. I have page(.aspx) consist of multiple Web User Controls(.ascx)

I would like to have an error handling machanism in such a way that if there is any exception in one of the user control, asp .net should show some friendly error message on a control. All other control should render as expected.

Is there any way this can be done without putting place holder on each control which you show/hide in case of exception?

Answer 1

You could do something like this.

An abstract base class with an abstract OnLoad() that each UserControl has to implement. You can use this same model for any event that you want to have shared error handling.

public abstract class BaseUserControl : UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            OnLoad();
        }
        catch (Exception)
        {
            //Custom error handling here
        }
    }

    protected abstract void OnLoad();
}

public class MyUserControl: BaseUserControl
{
    protected override void OnLoad()
    {
        //My normal load event handling here
    }
}