用ADO.NET来使用事务

先把代码段记下来，省得到时候要用的时候再去翻硬盘中的源文件

string connString = WebConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
        SqlConnection conn = new SqlConnection(connString);
        conn.Open();
        SqlTransaction tran = conn.BeginTransaction();    //创建事务Transaction

        string strSQL = "INSERT INTO Employees(FirstName, LastName, City, Address) values (@paramFirstName,@paramLastName,@paramCity,@paramAddress)";
        SqlCommand cmd = new SqlCommand(strSQL, conn,tran);        //创建SqlCommand

        try
        {
            cmd.Parameters.Add("@paramFirstName", SqlDbType.NVarChar, 20).Value = txtFirstName.Text;
            cmd.Parameters.Add("@paramLastName", SqlDbType.NVarChar, 10).Value = txtLastName.Text;
            cmd.Parameters.Add("@paramCity", SqlDbType.NVarChar, 15).Value = txtCity.Text;
            cmd.Parameters.Add("@paramAddress", SqlDbType.NVarChar, 60).Value = txtAddress.Text;
            cmd.ExecuteNonQuery();
            tran.Commit();        //确认事务
            txtMsg.Text = "新增数据成功,事务确认!";
        }
        catch
        {
            tran.Rollback();   //事务回滚
            txtMsg.Text = "新增数据失败,事务Rollback!";
        }

        finally
        {
            conn.Close();
            conn.Dispose();
            tran.Dispose();
            cmd.Dispose();
        }