using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;            //引入命名空间
using System.Data.SqlClient;  //引入命名空间
using System.Configuration;   //引入命名空间public partial class _2 : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e){if(!IsPostBack){GetData();}}protected void GetData() {SqlConnection con = new SqlConnection();        //定义数据库连接对象con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;  //定义数据库连接字符串SqlCommand com = new SqlCommand();              //定义数据库操作命令对象com.Connection = con;                           //连接数据库com.CommandText = "select CustomerID,CompanyName,ContactName,ContactTitle,Address from Customers"; //定义执行查询操作的sql语句SqlDataAdapter da = new SqlDataAdapter();       //创建数据适配器对象da.SelectCommand = com;                         //执行数据库操作命令DataSet ds = new DataSet();                     //创建数据集对象da.Fill(ds,"customers");                        //填充数据集GridView1.DataSource = ds.Tables["Customers"].DefaultView;//设置gridview控件的数据源为创建的数据集dsGridView1.DataBind();                           //绑定数据库表中数据
    }
}

 <asp:GridView ID="GridView1" runat="server" AllowPaging="True" PageSize="8"AutoGenerateColumns="False" onpageindexchanging="GridView1_PageIndexChanging" ><Columns><asp:BoundField DataField="CustomerID" HeaderText="编号" /><asp:BoundField DataField="CompanyName" HeaderText="公司名称" /><asp:BoundField DataField="ContactName" HeaderText="联系人" /><asp:BoundField DataField="ContactTitle" HeaderText="联系人头衔 " /><asp:BoundField DataField="Address" HeaderText="地址" /></Columns></asp:GridView>

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e){GridView1.PageIndex = e.NewPageIndex;GetData();}

protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e){GridView1.SelectedIndex = e.NewSelectedIndex; //实现选择功能
    }protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e){GridView1.EditIndex = e.NewEditIndex;  //实现编辑功能
        GetData();}protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e){GridView1.EditIndex = -1;//实现取消编辑功能
        GetData();}protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e){string customerId=GridView1.DataKeys[e.RowIndex][0].ToString();//取出修改行的主键值//取出修改后各字段的值string companyName = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).ToString();string contactName = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).ToString();string address = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).ToString();string phone = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[4].Controls[0])).ToString();//将用户更新的数据修改数据库SqlConnection con = new SqlConnection();        //定义数据库连接对象con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;  //定义数据库连接字符串SqlCommand com = new SqlCommand();              //定义数据库操作命令对象com.Connection = con;                           //连接数据库string sql = "update Customers set CompanyName=@companyName,ContactName=@contactName,Address =@address, Phone=@phone where CustomerId =@customerId ";con.Open();SqlCommand cmd = new SqlCommand(sql, con);cmd.Parameters.AddWithValue("@companyName", companyName);cmd.Parameters.AddWithValue("@contactName", contactName);cmd.Parameters.AddWithValue("@address", address);cmd.Parameters.AddWithValue("@phone", phone);cmd.Parameters.AddWithValue("@customerId", customerId);com.CommandText = sql.ToString();com.ExecuteNonQuery();con.Close();GridView1.EditIndex = -1;GetData();}

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e){string customerId = GridView1.DataKeys[e.RowIndex][0].ToString();//取出修改行的主键值
            SqlConnection con = new SqlConnection();        //定义数据库连接对象con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;  //定义数据库连接字符串SqlCommand com = new SqlCommand();              //定义数据库操作命令对象com.Connection = con;                           //连接数据库string sql = "delete from Customers  where CustomerId=@customerId";con.Open();SqlCommand cmd = new SqlCommand(sql, con);com.Parameters.AddWithValue("@customerId", customerId);com.ExecuteNonQuery();con.Close();GridView1.EditIndex = -1;GetData();    }