c#中获取存储过程的返回值(return Value)

              string connStr = "server=kofo;database=pubs;uid=sa;pwd=kofo123";

              SqlConnection myConnection = new SqlConnection(connStr);

              try

              {

                   myConnection.Open();

                   SqlCommand myCommand = new SqlCommand("TestRetValue",myConnection);

                   myCommand.CommandType = CommandType.StoredProcedure;

                   SqlParameter myParam = myCommand.Parameters.Add(new SqlParameter("@RETURN_VALUE",SqlDbType.Int,4));                

                   myParam.Direction = ParameterDirection.ReturnValue;             

                   myCommand.ExecuteNonQuery();

                   int me = (int)myParam.Value;

                   MessageBox.Show(me.ToString());

                  

              }

              catch(Exception ex)

              {

                   MessageBox.Show(ex.Message);

              }

              finally

              {

                   myConnection.Close();

              }