c#添加事物（全部执行和带保存点的执行）

 protected void Button2_Click(object sender, EventArgs e)
        {
            // 执行事务
            SqlConnection con = new SqlConnection(str);
            con.Open();
            SqlTransaction tran = con.BeginTransaction();

            try
            {
                SqlCommand cmd1 = new SqlCommand("INSERT INTO Code( name ) VALUES ( ‘ww1‘)", con);
                SqlCommand cmd2 = new SqlCommand("INSERT INTO Code( name ) VALUES ( ‘ww2‘)", con);
                cmd1.Transaction = tran;
                cmd2.Transaction = tran;
                cmd1.ExecuteNonQuery();
                cmd2.ExecuteNonQuery();
                tran.Commit();
            }
            catch
            {
                tran.Rollback();
            }
            finally
            {
                con.Close();
                GetData();
            }
        }

 protected void Button3_Click(object sender, EventArgs e)
        {
            // 执行带保存点的事务
            // 执行事务
            SqlConnection con = new SqlConnection(str);
            con.Open();
            SqlTransaction tran = null;
            tran = con.BeginTransaction();
            try
            {
                SqlCommand cmd1 = new SqlCommand("INSERT INTO Code( name ) VALUES ( ‘ww3‘)", con);
                SqlCommand cmd2 = new SqlCommand("INSERT INTO Code( name ) VALUES ( ‘ww4‘)", con);
                cmd1.Transaction = tran;
                cmd1.ExecuteNonQuery();
                tran.Save("One");
                cmd2.Transaction = tran;
                cmd2.ExecuteNonQuery();
                tran.Rollback("One");
                tran.Commit();
            }
            catch
            {
                tran.Rollback();

            }
            finally {
                con.Close();
                GetData();
            }
        }