try
        {
            string d = Convert.ToString(txtData.Text);
            int f = Convert.ToInt32(d);
            lblResult.Text = Convert.ToString(f);

        }
        catch (Exception ex)
        {

            System.Diagnostics.StackTrace trace = new System.Diagnostics.StackTrace(ex, true);
            var stackFrame = trace.GetFrame(trace.FrameCount - 1);
            var lineNumber = stackFrame.GetFileLineNumber();

            lblResult.Text = Convert.ToString(ex.Message)+Convert.ToString(lineNumber);
        }