在C#中使用控件DataGridView实现数据库增删改查

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 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 sp = new SqlParameter();
   da.DeleteCommand = conn.CreateCommand();
   da.DeleteCommand.CommandText = "delete region where regionid=@id";
   sp = da.DeleteCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");
   sp.SourceVersion = DataRowVersion.Original;
   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 sp = 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");

   sp = da.UpdateCommand.Parameters.Add("@oldid", SqlDbType.Int, 4, "regionid");
   sp.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!");
   }
  }


 }
}