的Visual Studio 2013 - 確認消息沒有私人無效

Question

更新的代碼

con.Open(); 
    int rowsAffected = cmd.ExecuteNonQuery(); 
    if(rowsAffected > 0) 
    MessageBox.Show("Record insertion succesful"); 
    else 
    MessageBox.Show("Cannot insert a new Record"); 
    cmd.ExecuteNonQuery(); 
    con.Close(); 

我使用Visual Studio 2013，並創建一個Windows C＃Web窗體應用程序，並已下添加一條記錄到數據庫的教程。它可以工作，但是我想在創建，編輯或刪除記錄後顯示確認消息。

在窗體控件我有：

private void Form1_Load(object sender, EventArgs e) 

在它保護無效的教程。我不能添加：

If (Page.IsPostBake == true) 

Label1.Text = ("Your record has been added to the database") 

由於未定義頁面。我如何輸出確認信息？

cmd.Parameters.AddWithValue("@forename", textBox1.Text); 

完整腳本：

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

namespace somecityform 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 

     } 

     private void label2_Click(object sender, EventArgs e) 
     { 

     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
      SqlConnection con = new SqlConnection("Data Source=MY-PC;Initial Catalog=somecity;Integrated Security=True"); 
      con.Open(); 
      SqlCommand cmd = new SqlCommand("Insert into somecity.staff (forename, surname, office, email) Values ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')", con); 
      con.Open(); 
      cmd.ExecuteNonQuery(); 
      con.Close(); 
     } 

     private void button4_Click(object sender, EventArgs e) 
     { 
      this.Close(); 
     } 

     private void button2_Click(object sender, EventArgs e) 
     { 
      SqlConnection con = new SqlConnection("Data Source=MY-PC;Initial Catalog=somecity;Integrated Security=True"); 
      con.Open(); 
      SqlCommand cmd = new SqlCommand(@"update somecity.staff SET forename='" + textBox1.Text + "', surname='" + textBox2.Text + "', office='"+ textBox3.Text +"', email='"+textBox4.Text +"' WHERE (staffnum= '" + textBox5.Text +"')", con); 
      cmd.ExecuteNonQuery(); 
      con.Close(); 
     } 

     private void label6_Click(object sender, EventArgs e) 
     { 

     } 

     private void label7_Click(object sender, EventArgs e) 
     { 

     } 

     private void button3_Click(object sender, EventArgs e) 
     { 
      SqlConnection con = new SqlConnection("Data Source=MY-PC;Initial Catalog=somecity;Integrated Security=True"); 
      con.Open(); 
      SqlCommand cmd = new SqlCommand(@"delete from somecity.staff WHERE (staffnum= '" + textBox5.Text + "')", con); 
      cmd.ExecuteNonQuery(); 
      con.Close(); 
     } 
    } 
} 

Answer 1

的ExecuteNonQuery返回表示被插入，修飾或由命令刪除的行的數量的整數值。在你的情況下，你只需要添加

con.Open(); 
int rowsAffected = cmd.ExecuteNonQuery(); 
if(rowsAffected > 0) 
    MessageBox.Show("Record insertion succesful"); 
else 
    MessageBox.Show("Cannot insert a new Record"); 
con.Close();