base page asp.net error handling

basepage class:

 
public delegate void   UnSafeProcedure();
public class BasePage : System.Web.UI.Page
{
   public CAssertions assert= new CAssertions(); // my own assertor, produce AssertionException 
    public void RunSafe(UnSafeProcedure s)
    {
	try
	{
	    s();
	}
	catch (Exception e1)
	{
	    if (e1.GetType().FullName == "AssertionException")
	    {

		ShowMessage(e1.Message);

	    }
	    else
	    {
		ShowMessage("Unhandled Exception");
		Debug.Write(e1.ToString());
	    }
	}

    }
    // will be overwrited on actual page:
    public virtual void ShowMessage(string s) { Debug.Write(s); }
}

This is how actual page would look like:

  
public partial class NewEft : BasePage {
        protected void SubmitButtonClick(object sender, EventArgs e) {
            RunSafe(Submit);
        }

        private void Submit() {

            AUtyl butyl = new AUtyl();
            assert.IsTrue(butyl.CheckRoutingNumberByRouting(txtRoutingNumber.Text), "Routing Number is invalid");
        }

        public override void ShowMessage (string s ) { lblMessage.Text = s; }
    }

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