To get line number during exception log

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ASP.NET

exceptions

Hi
I want to log the line number where the exception has occurred in global.asax.
I have used the following code to get the line number but returns 0 by default

void Application_Error(object sender, EventArgs e) 
    { 
        // Code that runs when an unhandled error occurs
        Exception ex = Server.GetLastError();
        System.Diagnostics.StackTrace trace = new System.Diagnostics.StackTrace(ex, true);
        System.Diagnostics.StackFrame fm = new System.Diagnostics.StackFrame(true);
        string sline = trace.GetFrame(trace.FrameCount - 1).GetFileLineNumber().ToString();
     }

Note: The following code to get linenumber works fine when I tried within try catch block