C# 事務

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace 事務範例
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public SqlConnection ConnectDB()
        {
            string MySqlConnection = "user id=sa;password=sa;Database =RSS;data source=127.0.0.1;Connect Timeout=30";
            SqlConnection conn = new SqlConnection(MySqlConnection);
            return conn;

        }

        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection conn = ConnectDB();
            SqlTransaction tran;
            try
            {
                conn.Open();
                tran = conn.BeginTransaction();
            }
            catch
            {
                return;
            }
            try
            {
                SqlCommand cmd = new SqlCommand("delete from rss where newsAuthor='未知'", conn);
                cmd.Transaction = tran;
                cmd.ExecuteNonQuery();
                tran.Commit();
            }
            catch
            {
                tran.Rollback();
                return;
            
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Dispose();
                    conn.Dispose();
                }
            }
            MessageBox.Show("OK");

        }
    }
}