gridview控件实现的增删改

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;


public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
    }
    public void getData()
    {
        SqlConnection cn = new SqlConnection("server=localhost;database=Northwind;user=grid;password=grid");
        SqlCommand cmd = new SqlCommand("select top 30 * from Customers", cn);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds, "Customers");
        this.GridView1.DataSource = ds.Tables[0].DefaultView;
        this.DataBind();

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        getData();
    }

    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        this.GridView1.PageIndex = e.NewPageIndex;
        getData();
    }
    protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
    {

    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string CustomerID = this.GridView1.DataKeys[e.RowIndex][0].ToString();
        deleteCustomers(CustomerID);
        getData();
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        this.GridView1.EditIndex = e.NewEditIndex;
        getData();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        string CustomerID = this.GridView1.DataKeys[e.RowIndex][0].ToString();
        string CompanyName = ((TextBox)this.GridView1.Rows[e.RowIndex].Cells[0].Controls[0]).Text.ToString();
        string ContactName = ((TextBox)this.GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text.ToString();
        string Address = ((TextBox)this.GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text.ToString();
        //Response.Write(Cus + "---" + CompanyName);
        updateCustomers(CustomerID, CompanyName, ContactName, Address);
        this.GridView1.EditIndex = -1;
        getData();
    }

    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        this.GridView1.EditIndex = -1;
        getData();
    }
    public void updateCustomers(string CustomerID,string CompanyName,string ContactName,string Address)
    {
        SqlConnection cn = new SqlConnection("server=localhost;database=Northwind;user=grid;password=grid");
        SqlCommand cmd = new SqlCommand("update Customers set CompanyName='" + CompanyName + "', ContactName='" + ContactName+"',Address='"+Address  +"' where CustomerID='"+CustomerID +"'", cn);
        cn.Open();
        cmd.ExecuteNonQuery();
        cn.Close();
    }
    public void deleteCustomers(string CustomerID)
    {
        SqlConnection cn = new SqlConnection("server=localhost;database=Northwind;user=grid;password=grid");
        SqlCommand cmd = new SqlCommand("delete from  Customers  where CustomerID='" + CustomerID + "'", cn);
        cn.Open();
        cmd.ExecuteNonQuery();
        cn.Close();
    }
  
}

<asp:GridView ID="GridView1" runat="server" Width ="86%" BackColor="White" 
            BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="3" 
            AutoGenerateColumns="False" AllowPaging="True" 
            OnPageIndexChanging="GridView1_PageIndexChanging" PageSize="6" 
            DataKeyNames="CustomerID,CompanyName,ContactName,Address" 
            OnRowCancelingEdit="GridView1_RowCancelingEdit" 
            OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing"  
            OnRowUpdating="GridView1_RowUpdating" 
            OnSelectedIndexChanging="GridView1_SelectedIndexChanging"  >
            <FooterStyle BackColor="White" ForeColor="#000066" />
            <RowStyle ForeColor="#000066" />
            <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
            <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
            <Columns>
                <asp:BoundField DataField="CompanyName" HeaderText="公司名称" />
                <asp:BoundField DataField="ContactName" HeaderText="联系人名称" />
                <asp:BoundField DataField="Address" HeaderText="地址" />
                <asp:CommandField ShowEditButton="True" />
                <asp:CommandField ShowSelectButton="True" />
                <asp:CommandField ShowDeleteButton="True" />
               
              
            </Columns>
        </asp:GridView>