C#2005中使用控件DataGridView实现对数据库增删改查操作

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

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

private DataSet ds = new DataSet();
private SqlConnection conn = null;
private SqlDataAdapter da = null;
private const string DRIVER = "server=.;database=northwind;uid=sa;pwd=sa";
private const string sql_select = "select * from region";

/**//**
* 此方法为将数据库northwind中的region表的数据查询出来并放入DataSet中
**/
private void Form1_Load(object sender, EventArgs e)
   {
          conn = new SqlConnection(DRIVER);
          da = new SqlDataAdapter(sql_select,conn);
          da.Fill(ds,"table");
          this.dataGridView1.DataSource = ds.Tables["table"].DefaultView;
}

private bool BtnInsert() //此方法作用于添加
   {
          da.InsertCommand = conn.CreateCommand();
          da.InsertCommand.CommandText = "insert into region(id,ption) values(@id,@ption)";
          da.InsertCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");
          da.InsertCommand.Parameters.Add("@ption", SqlDbType.VarChar, 10, "regiondescription");
          int count = da.Update(ds);
          bool result = count > 0 ? true : false;
          return result;
}
private void button1_Click(object sender, EventArgs e)
{
          if (this.BtnInsert())//调用此方法
          {
               MessageBox.Show("添加成功!");
          }
          else 
         {
               MessageBox.Show("添加失败!");
         }
}


private bool BtnDelect() //此方法作用于删除
{
     SqlParameter para = new SqlParameter();
     da.DeleteCommand = conn.CreateCommand();
     da.DeleteCommand.CommandText = "delete from region where regionid=@id";
     para = da.DeleteCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");
     para .SourceVersion = DataRowVersion.Original; //获取原始值
     ds.Tables["table"].Rows[this.dataGridView1.CurrentRow.Index].Delete();
     int count = da.Update(ds);
     bool result = count > 0 ? true : false;
     return result;
}
private void button2_Click(object sender, EventArgs e)
{
     if (this.BtnDelect())//调用删除方法
     {
          MessageBox.Show("删除成功!");
     }
     else
     {
          MessageBox.Show("删除失败!");
     }
}


private bool BtnUpdate() //此方法作用于修改
{
     SqlParameter para = new SqlParameter();
     da.UpdateCommand = conn.CreateCommand();
     da.UpdateCommand.CommandText = "update region set regionid=@id,regiondescription=@ption where regionid=@oldid";

     da.UpdateCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");
     da.UpdateCommand.Parameters.Add("@ption", SqlDbType.VarChar, 10, "regiondescription");

     para = da.UpdateCommand.Parameters.Add("@oldid", SqlDbType.Int, 4, "regionid");
     para .SourceVersion = DataRowVersion.Original;

     int count = da.Update(ds);
     bool result = count > 0 ? true : false;
     return result;
}
private void button3_Click(object sender, EventArgs e)
{
     if (this.BtnUpdate())//调用修改方法
     {
          MessageBox.Show("修改成功!");
     }
     else
     {
          MessageBox.Show("修改失败!");
     }
}
}
}