Trap error in C# app from calling Stored Proc in MS SQL 2005

using System.Data.SqlClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace SqlErrorHandling
{
	public partial class Form1 : Form
	{
		public Form1()
		{
			InitializeComponent();
		}
 
		private void Form1_Load(object sender, EventArgs e)
		{
			try
			{
 
				using (SqlConnection cnn = new SqlConnection(Properties.Settings.Default.LibData))
				{
					cnn.Open();
 
 
					SqlCommand cmd = new SqlCommand("spMemberid", cnn);
					try
					{
						SqlDataReader dr = cmd.ExecuteReader();
					}
					catch(Exception ed)
					{
						txtErrorMessage.Text = "ed exception message: " + ed.Message;
					}
					//txtReaderResult.Text = dr.RecordsAffected.ToString();
					//txtReaderResult.Text = someAction(9);
				}
			}
			catch (SqlException se)
			{
				txtErrorMessage.Text = "SQL exception catch: " + se.Message;
			}
			catch (Exception ex)
			{
				txtErrorMessage.Text = "Exception only catch:  " +ex.Message;
 
			}
		}
		private string someAction(int num)
		{
			MessageBox.Show("message :" + 9);
			return "hi there " + num;
 
		}
	}
}
//############
--sql script
USE [library]
GO
/****** Object:  StoredProcedure [dbo].[spMemberid]    Script Date: 12/12/2008 23:46:36 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
 
CREATE PROCEDURE [dbo].[spMemberid]
	--@membNo int =null
AS
BEGIN TRY
--		SELECT * from adult
--		where member_no = name
-- Generate a divide-by-zero error.
    SELECT 1/0;
	END TRY
	BEGIN CATCH
	 return SELECT
        ERROR_NUMBER() AS ErrorNumber,
        ERROR_SEVERITY() AS ErrorSeverity,
        ERROR_STATE() AS ErrorState,
        ERROR_PROCEDURE() AS ErrorProcedure,
        ERROR_LINE() AS ErrorLine,
        ERROR_MESSAGE() AS ErrorMessage;
--PRINT 'Test AddAdult: FAIL -- CAUGHT Exception';
--            PRINT 'Error Message: ' + ERROR_MESSAGE();
--            PRINT 'Error Severity: ' + CAST(ERROR_SEVERITY() as varchar);
--            PRINT 'Error Number: ' + CAST(ERROR_NUMBER() as varchar);
--            PRINT 'Error State: ' + CAST(ERROR_STATE() as varchar);
--            PRINT 'Line Number: ' + CAST(ERROR_LINE() as varchar);
		
	END CATCH;