GridView CheckBox 批量剔除_ASP.NET

GridView CheckBox 批量删除
gridview里面放了checkbox来实现批量删除，现在发现一个问题，就是我在第一页选中一项，第二页选中一项，点击删除，只能删除第二页我选中的那个，第一页选中的没有删除。
删除按钮代码

C# code

protected void igb_delete_Click(object sender, ImageClickEventArgs e)        {            string IDlist = Common.PublicMethod.CheckCbx(this.GVdata, "chb_delete", "LabVisible");            if (IDlist.Trim() != "")            {                if (!Warningbll.DeleteList(IDlist))                {                    Response.Write("<script>alert('删除选中记录时发生错误！请重新登陆后重试！');</script>");                }                else                {                    GVdataDataBind();                }            }            else            {                this.ClientScript.RegisterStartupScript(this.GetType(), Guid.NewGuid().ToString(), " alert('请选择你要删除的项！'); ", true);                return;            }        }

C# code

//判断GridView里面被选中的ID        public static string CheckCbx(GridView GVData, string CheckBoxName, string LabID)        {            string str = "";            for (int i = 0; i < GVData.Rows.Count; i++)            {                GridViewRow row = GVData.Rows[i];                CheckBox Chk = (CheckBox)row.FindControl(CheckBoxName);                Label LabVis = (Label)row.FindControl(LabID);                if (Chk.Checked == true)                {                    if (str == "")                    {                        str = LabVis.Text.ToString();                    }                    else                    {                        str = str + "," + LabVis.Text.ToString();                    }                }            }            return str;        }

前台分页代码

HTML code

<asp:ImageButton ID="BtnFirst" runat="server" CommandName="First" ImageUrl="../../images/Button/First.jpg"                                        OnClick="PagerButtonClick" Style="height: 14px" />                                    <asp:ImageButton ID="BtnPre" runat="server" CommandName="Pre" ImageUrl="../../images/Button/Pre.jpg"                                        OnClick="PagerButtonClick" Style="height: 14px" />                                    <asp:ImageButton ID="BtnNext" runat="server" CommandName="Next" ImageUrl="../../images/Button/Next.jpg"                                        OnClick="PagerButtonClick" Style="width: 16px" />                                    <asp:ImageButton ID="BtnLast" runat="server" CommandName="Last" ImageUrl="../../images/Button/Last.jpg"                                        OnClick="PagerButtonClick" Style="height: 14px; width: 16px;" />

后台分页代码

C# code

string arg = ((ImageButton)sender).CommandName.ToString();            switch (arg)            {                case ("Next"):                    if (this.GVdata.PageIndex < (GVdata.PageCount - 1))                        GVdata.PageIndex++;                    break;                case ("Pre"):                    if (GVdata.PageIndex > 0)                        GVdata.PageIndex--;                    break;                case ("Last"):                    try                    {                        GVdata.PageIndex = (GVdata.PageCount - 1);                    }                    catch                    {                        GVdata.PageIndex = 0;                    }                    break;                default:                    //本页值                    GVdata.PageIndex = 0;                    break;            }            GVdataDataBind();