Question

点击gridview控件的删除时没反应？

我用asp.net+access做一个gridview的例子，点击删除时它只是将页面刷新了一下，所选数据行却没被删除？ 这是为什么？ 请各位大虾帮忙找一下我错在哪里，多谢了！下面是我的运行结果和相关代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.OleDb;

public partial class banji_chaxun1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if((int)Session["qx"]<1)
Response.Redirect("/WebSite3/login.aspx");
if(!IsPostBack)
{
bind();
}
}
public void bind()
{
string s = "Provider=microsoft.jet.oledb.4.0;data source=" + Server.MapPath("~") + "\\Tree.mdb";
OleDbConnection conn = new OleDbConnection(s);
OleDbDataAdapter da = new OleDbDataAdapter("select * from Class", conn);
OleDbCommandBuilder cmd = new OleDbCommandBuilder(da);
DataSet ds = new DataSet();
da.Fill(ds, "Class");
GridView1.DataSource = ds.Tables["Class"];
GridView1.DataKeyNames = new string[] {"BanID"};
GridView1.DataBind();
conn.Close();
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
string s = "provider=microsoft.jet.oledb.4.0;data source=" + Server.MapPath("~") + "\\Tree.mdb";
string sl = "delete from Student where BanID=" + GridView1.DataKeys[e.RowIndex].Value.ToString();
OleDbConnection conn = new OleDbConnection(s);
conn.Open();
OleDbCommand cmd = new OleDbCommand(sl, conn);
cmd.ExecuteNonQuery();
conn.Close();
bind();
}
}

Answer 1

1.没有运行RowDeleting事件。
2.条件不满足，也就是说，
string sl = "delete from Student where BanID=" + GridView1.DataKeys[e.RowIndex].Value.ToString();
这句话中GridView1.DataKeys[e.RowIndex].Value.ToString()的值不正确或没有值。