Stored procedure with MySQL

//MySQL Database supports stored procedure
//starting from the version 5.0
//stored procedure is one of the new features
//in MySQL

//Create a class library for MySQL database operation
//database operation

//for connecting to MySQL with dotnet
//you need to download the MySQL driver for dotnet
//from MySQL website,add MySQL.Net.dll to project

using System;
using System.Collections.Generic;
using System.Text;
using MySql.Data.MySqlClient; //namespace for conecting to MySQL
namespace CustomerDAL_MySQL
{
    public class DataAccessSP
    {
        //function which is used to store the customer name in a table
        //parameters connectionstring,refid,name
        public long  SaveCustomer(string sConnString, string  id,string name)
        {
            try
            {
                using (MySqlConnection oConn = new MySqlConnection(sConnString))
                {
                    oConn.Open();
                    MySqlCommand oCommand = oConn.CreateCommand();
                    oCommand.CommandText = "cust_SaveCustomer";
                    oCommand.CommandType = System.Data.CommandType.StoredProcedure;
                    oCommand.Connection = oConn;
                    MySqlParameter custid = oCommand.Parameters.Add("in_id", MySqlDbType.Int32);
                    custid.Value = Convert.ToInt64(id);

                    MySqlParameter custname = oCommand.Parameters.Add("in_custname", MySqlDbType.VarChar, 255);
                    custname.Value = name;

                    long res = oCommand.ExecuteNonQuery();
                    return res;
                }
            }
            catch (MySqlException mx)
            {
                throw mx;
            }
        }
    }
}

protected void btnsave_Click(object sender, EventArgs e)
    {
        string conString = ConfigurationManager.ConnectionStrings["mainConn"].ConnectionString;
        DataAccessSP sp = new DataAccessSP();
        sp.SaveCustomer(conString, "-1", txcustname.Text.Trim());
    }