求大神指教 我这里面的删除不好用 怎么改呢

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;


public partial class Datas_index_dw : System.Web.UI.Page
{
    DataBase db = new DataBase();
    String sql = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Session["ano"] == null)
            {
                Response.Write("<script> javascript:alert('请先登录！'); </script>");
                Response.Redirect("../login.aspx");
            }
            else
            {
                sql = "select * from dw";
                getdata(sql);
            }
        }
    }
    private void getdata(string sql)
    {
        DataSet result = db.Getdata(sql);
        if (result != null)
        {
            if (result.Tables[0].Rows.Count > 0)
            {
                GridView1.DataSource = result.Tables[0];
                GridView1.DataKeyNames = new string[] { "dno" };
                GridView1.DataBind();
            }
            else
            {
                Response.Write("<script> javascript:alert('没有相关记录'); </script>");
                GridView1.DataSource = result.Tables[0];
                GridView1.DataKeyNames = new string[] { "dno" };
                GridView1.DataBind();
            }
        }
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[6].Attributes.Add("onclick", "return confirm('你确认要删除吗?')");
            
        }
      
    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        GridView1.DataBind();
    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {

    }
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        int index = Int32.Parse(());
        string id = GridView1.Rows[index].Cells[1].Text;
        if ( == "edits")
        {
           Response.Redirect("modify_dw.aspx?id=" + id);
        }
    }
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
}



删除点了之后弹出是否确认删除 点确认之后无效果 不知道错在哪里了求解