Can I show an alert from Global.asax on a page that's experiencing a SQL Timeout?

Question

In Global.asax, is there a way to handle SQL Timeouts elegantly, and display a message on the requesting page explaining the error? I know Global.asax has the Application_Error and Error events, but I'm not sure which (if any) I could use to accomplish this.

Related, can I access the page instance which raised the error that Global.asax is handling?

Thanks!

Answer 1

You could use the web.config custom errors as explained here

Answer 2

In global.asax.vb

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)

        If TypeOf (Context.Error.GetBaseException) Is System.Data.SqlClient.SqlException Then

            Dim ex As System.Data.SqlClient.SqlException = Context.Error.GetBaseException

            If (ex.Errors.Count = 1 And ex.Number = -2) Then

                Server.ClearError()

                Response.Redirect(Context.Request.Url.ToString() & "?error=MessageHere")

            End If


        End If

End Sub

In C#

public void Application_Error(object sender, EventArgs e)
{
    if ((Context.Error.GetBaseException) is System.Data.SqlClient.SqlException) {
        
        System.Data.SqlClient.SqlException ex = Context.Error.GetBaseException;
        
        if ((ex.Errors.Count == 1 & ex.Number == -2)) {
            
            Server.ClearError();
                
            Response.Redirect(Context.Request.Url.ToString() + "?error=MessageHere");
            
        }
    }
}