ASP.NET是通過ADO.NET來訪問數(shù)據(jù)庫的

數(shù)據(jù)提供者包含4個主要組件：

Connection:用于連接到數(shù)據(jù)庫或其它數(shù)據(jù)源。
Command:用于在數(shù)據(jù)庫中檢索、編輯、刪除、或插入數(shù)據(jù)。
DataReader：從數(shù)據(jù)源提供數(shù)據(jù)流。這些數(shù)據(jù)只讀（不可修改），我們只能向前經(jīng)過這些數(shù)據(jù)。

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DataReader對象沒有公用的構(gòu)造函數(shù)，所以不能使用DataReader對象的構(gòu)造函數(shù)來創(chuàng)建一個DataReader對象，只能用Command對象中的ExecuteReader方法來創(chuàng)建一個DataReader對象

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DataAdapter:用于將數(shù)據(jù)源中的數(shù)據(jù)填充到DataSet中，并將在DataSet中數(shù)據(jù)的變化返回到數(shù)據(jù)庫中?？梢詫?shù)據(jù)適配器看作是DataSet與數(shù)據(jù)庫之間的橋梁。

DataSet :數(shù)據(jù)集,相當(dāng)于駐留在內(nèi)存中的數(shù)據(jù)庫

使用Ado.NET實現(xiàn)以下功能：

private void Form1_Load(object sender, System.EventArgs e)
  {
   bind();
  }
        //查找用戶信息
  void bind()
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   SqlDataAdapter sda=new SqlDataAdapter("select * from login",conn);
   DataSet ds=new DataSet();
   sda.Fill(ds,0,0,"login");
   this.dataGrid1.DataSource=ds.Tables["login"];
  }
  
  //Sql語句增加 =====SqlDataAdapter與DataSet組合
  private void button1_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
//   string username=this.textBox1.Text;
//   string userpwd=this.textBox2.Text;
   SqlDataAdapter sda=new SqlDataAdapter("insert into login(uname,upwd) values('"+this.textBox1.Text+"','"+this.textBox2.Text+"')",conn);
   DataSet ds=new DataSet();
   sda.Fill(ds,0,0,"login");
   bind();
  }
  //存儲過程增加
  private void button5_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   SqlDataAdapter sda=new SqlDataAdapter("SqlAndProc_Login_Insert",conn);
   sda.SelectCommand.CommandType=CommandType.StoredProcedure;
   sda.SelectCommand.Parameters.Add("@name",this.textBox1.Text);
   sda.SelectCommand.Parameters.Add("@pwd",this.textBox2.Text);
   DataSet ds=new DataSet();
   sda.Fill(ds,0,0,"login");
   bind();
  }
  //Sql語句刪除=====SqlDataAdapter與DataSet組合
  private void button2_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   SqlDataAdapter sda=new SqlDataAdapter("delete from login where uname='"+this.textBox1.Text+"'",conn);
   DataSet ds=new DataSet();
   sda.Fill(ds,"login");
   this.dataGrid1.DataSource=ds.Tables["login"];
   bind();
  }
  //存儲過程刪除(刪除輸入的用戶名的記錄)
  private void button6_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   SqlDataAdapter sda=new SqlDataAdapter("SqlAndProc_Login_Del",conn);
   sda.SelectCommand.CommandType=CommandType.StoredProcedure;
   sda.SelectCommand.Parameters.Add("@name",this.textBox1.Text);
   DataSet ds=new DataSet();
   sda.Fill(ds,0,0,"login");
   bind();
  }
  //Sql語句查找=====SqlDataAdapter與DataSet組合
  private void button3_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");  
   SqlDataAdapter sda=new SqlDataAdapter("select * from login where uname='"+this.textBox1.Text+"'",conn);
   DataSet ds=new DataSet();
   sda.Fill(ds,"login");
   this.dataGrid1.DataSource=ds.Tables["login"];

  }
  //存儲過程查找
  private void button7_Click(object sender, System.EventArgs e)
  {   
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   SqlDataAdapter sda=new SqlDataAdapter("SqlAndProc_Login_Select",conn);
   sda.SelectCommand.CommandType=CommandType.StoredProcedure;
   sda.SelectCommand.Parameters.Add("@name",this.textBox1.Text);
   DataSet ds=new DataSet();
   sda.Fill(ds,"login");
   this.dataGrid1.DataSource=ds.Tables["login"]; 
   
   
  }
  //Sql語句修改
  private void button4_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   conn.Open();
   SqlCommand cmd=new SqlCommand("update login set upwd='"+this.textBox2.Text+"' where uname='"+this.textBox1.Text+"'",conn);
   int i=cmd.ExecuteNonQuery();
   if(i==1)
   {
    MessageBox.Show("密碼修改成功!!!");
   }
   conn.Close();
   bind();
  }
  //存儲過程修改
  private void button8_Click(object sender, System.EventArgs e)
  {
   SqlConnection conn=new SqlConnection("server=.;database=DBForADO;uid=sa;pwd=;");
   SqlDataAdapter sda=new SqlDataAdapter("SqlAndProc_Login_Update",conn);
   sda.SelectCommand.CommandType=CommandType.StoredProcedure;
   sda.SelectCommand.Parameters.Add("@name",this.textBox1.Text);
   sda.SelectCommand.Parameters.Add("@pwd",this.textBox2.Text);
   DataSet ds=new DataSet();
   sda.Fill(ds,0,0,"login");
   bind();
  }