string usernos = String.Join(",", list.ToArray());//把它放到队列中
        try
        {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["ConStr"]))
            {
                conn.Open();
                string DeleteCmd = string.Format("delete from staff where userno in ({0})", usernos);
                using (SqlCommand MyCommand = new SqlCommand(DeleteCmd, conn))
                {
                    MyCommand.ExecuteNonQuery();
                }
                conn.Close();
            }
            GridView11.DataBind();
            Response.Write("<script language='javascript'>alert('成功删除！')</script>");
        }
        catch
        {
            Response.Write("<script>alert('删除失败！');history.back();</Script>");
        }

是什么意思啊？尤其是 string DeleteCmd = string.Format("delete from staff where userno in ({0})", usernos);

我用这几条语句实现删除怎么总是说删除失败啊，总也删不了，也不报错，这是怎么回事啊，
string usernos = String.Join(",", list.ToArray());这个队列是怎么调用的啊，能不能给解释一下删除的思路啊，

做批量删除

恩  好的

在html中 ：<script   language="javascript">   
  function   myCheck1()   
    {   
          var   mycount   =   0   ;   
          var   mm   =   document.getElementsByTagName("input").length   ;
            
        for(var i=0;i<mm;i++)   
         {   
             var   dd   =   document.getElementsByTagName("input").item(i);   
           if(dd.type   ==   "checkbox")   
            {   
               if(dd.checked   ==   true)   
                   {   
                     mycount   +=   1;   
                            }   
                    }   
                }   
   
          if(mycount   ==   0)   
        {   
           alert("您还未选择,请选择!");   
           return(false);   
          }   
        else   
         {   
               return(confirm("本次操作将删除该时间段的所有记录，注意！是该时间段！您真的要删除它吗?"));   
          }   
  }   
  </script>   
   
   
   
 <script   language="javascript">
 function CheckAllCus1()
 {
    var opt = document.getElementById("checkAccept");
    var tb = document.getElementById("<%=GridView1.ClientID%>");
    var arr = tb.getElementsByTagName("input");
    for(i=0;i<arr.length;i++){
        if(arr[i].type == "checkbox"){
            arr[i].checked = opt.checked;
        }
    }
}

在GRIDVIEW 中
  <asp:TemplateField>   
                        <HeaderStyle   Width="3%"></HeaderStyle>   
                        <HeaderTemplate>   
                        <asp:Label   id="Label4"   runat="server"> 全选 </asp:Label>
                        <INPUT   id="checkAccept"   type="checkbox"  onclick="CheckAllCus1()">   
                        </HeaderTemplate>   
                        <ItemTemplate>   
                        <asp:CheckBox   id="CB1"   runat="server"></asp:CheckBox>   
                        </ItemTemplate>   
                        </asp:TemplateField>

在.CS中  
   PAGE LOAD 中：
this.shanchu.Attributes.Add("onclick", "return(myCheck1());");

在删除按钮中：

 protected void shanchu_Click1(object sender, EventArgs e)
    {
        List<string> list1 = new List<string>();//定义一个list行的队列
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            CheckBox cb1 = (CheckBox)GridView1.Rows[i].Cells[11].FindControl("CB1");//将GRIDVIEW中的每行的按钮的ID参数赋给 cb
            if (cb1.Checked == true)
            {
                list1.Add(GridView1.DataKeys[i].Value.ToString());//将选中的行记录到LIST中
            }
        }

        if (list1.Count <= 0)//没有选中的按钮
        {
            Response.Write("<script language='javascript'>alert('请选择要删除的项！')</script>");
            return;
        }


        string usernos = String.Join(",", list1.ToArray());
        try
        {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["ConStr"]))
            {
                conn.Open();
                string DeleteCmd = string.Format("delete from suppliers where supplyersid in ({0})", usernos);
                using (SqlCommand MyCommand = new SqlCommand(DeleteCmd, conn))
                {
                    MyCommand.ExecuteNonQuery();
                }
                conn.Close();
            }
            GridView1.DataBind();
            Response.Write("<script language='javascript'>alert('成功删除！')</script>");
        }
        catch
        {
            Response.Write("<script>alert('删除失败！');history.back();</Script>");
        }
    }

这是这个的思路，但是出了点问题，青格儿，你帮忙给改改，你运行一下

你这是什么语言的啊，我做的是C#，我的那个只是实现了时间段的删除，就是说这次添加的可以删，但是以前添加的就不能删了

你这个可以实现全选删除？