Im Using Below Link....Can I Add Edit And Delete Columns...But Edit Delete Last Row Was Not Working Plz Find Out.... May Be Index Was Problem.

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ASP.NET

Search GridView records (data) on TextBox KeyPress using ..
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sourse code is
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<%@ Page Language="C#" MasterPageFile="~/Main.Master" AutoEventWireup="true" CodeBehind="LeaveTypes.aspx.cs" Inherits="vpayroll.LeaveTypes"  Title="Untitled Page" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

   <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" ></script>
<script type="text/javascript">
    function close_window(url){
    var newWindow = window.open('', '_self', ''); //open the current window
    window.close(url);
 }
                }
            });
        });
    });
</script>

 <script type="text/javascript">
     function CheckNumeric(e) {

         if (window.event) // IE
         {
             if ((e.keyCode < 48 || e.keyCode > 57) & e.keyCode != 8 ) {
                 event.returnValue = false;
                 alert('Please Enter Numbers');
                 return false;

             }
         }
         else { // Fire Fox
             if ((e.which < 48 || e.which > 57) & e.which != 8) {
                 e.preventDefault();
                 alert('Please Enter Numbers');
                 return false;

             }
         }
     }
     </script>



<div class="div">
        Leave Types&nbsp;&nbsp;&nbsp;&nbsp;
        <span style="color: #FFFFFF; font-style: normal; font-weight: normal">Search:</span>
        <asp:DropDownList ID="Srch_Type" runat="server" Width="9%" />
        <asp:TextBox ID="Srch_Text" runat="server" Width="7%"></asp:TextBox>
        <asp:ImageButton ID="Srch_Btn" runat="server" ImageAlign="Baseline" ImageUrl="Images/Search_Icon_16x16.png" />

                <div style="vertical-align: middle; float: right; text-align: right;">
            <asp:ImageButton ID="btnNew" runat="server" ImageUrl="~/Images/Add.png" Width="7%"
                        Height="16px" onclick="btnNew_Click" />

            <asp:LinkButton ID="lkbSave" runat="server" Font-Bold="True" Text="New Leave Type"
                Font-Underline="False" ForeColor="White" CssClass="LinkButton" onclick="lkbSave_Click">
                         </asp:LinkButton>

        </div>
        </div>


      <div>
    <asp:GridView ID="gvLeaveTypes" runat="server" AllowPaging="true"
            AllowSorting="true" AutoGenerateColumns="False"   ForeColor="#333333" Width="100%"
             Height="50%" onrowediting="gvLeaveTypes_RowEditing"
            PageSize="10" CellPadding="4" CellSpacing="3"    GridLines="None"  onrowdeleting="gvLeaveTypes_RowDeleting"
            onpageindexchanging="gvLeaveTypes_PageIndexChanging"  OnDataBound="gvLeaveTypes_DataBound"  >
            <Columns>
    <asp:TemplateField HeaderText="LeaveCode"  ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left"  >
    <ItemTemplate>
    <asp:Label ID="lblLeaveCode" runat="server"  Text='<%#Eval("lv_type_code") %>'></asp:Label>
     <asp:Label ID="lbllv_type_id" runat="server"   Text='<%#Eval("lv_type_id") %>' Visible="false"></asp:Label>
    </ItemTemplate>
    </asp:TemplateField>

     <asp:TemplateField HeaderText ="Leave Type"  ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left"  >
    <ItemTemplate>

    <asp:Label ID="lblLeaveType" runat="server"  Text='<%#Eval("lv_type_name") %>'></asp:Label>

    </ItemTemplate>
    </asp:TemplateField>

    <asp:TemplateField HeaderText="Days"  ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left" >
    <ItemTemplate>
    <asp:Label ID="lblDays" runat="server"  Text='<%#Eval("lv_type_days") %>'></asp:Label>
    </ItemTemplate>
    </asp:TemplateField>
    <asp:TemplateField HeaderText="Edit"  ItemStyle-HorizontalAlign="Center">
                    <ItemTemplate>
                        <asp:ImageButton ID="imgbtnEdit" CommandName="Edit" runat="server" ImageUrl="~/Images/Edit.png"
                            ToolTip="Edit" Height="25px" Width="25px" CommandArgument='<%#Eval("lv_type_id") %>' />
                    </ItemTemplate>



<ItemStyle HorizontalAlign="Center"></ItemStyle>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Delete"   ItemStyle-HorizontalAlign="Center">
                    <ItemTemplate>
                        <asp:ImageButton ID="imgbtnDelete" CommandName="Delete" Text="Delete" runat="server"
                            ImageUrl="~/Images/Delete.png" ToolTip="Delete" Height="25px" Width="25px" CommandArgument='<%#Eval("lv_type_id") %>' OnClientClick="return ConfirmOnDelete('');"/>
                    </ItemTemplate>



<ItemStyle HorizontalAlign="Center"></ItemStyle>
                </asp:TemplateField>
    </Columns>
     <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="Aqua" Font-Bold="True" ForeColor="#333333" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BackColor="#ff99ff" />
        <AlternatingRowStyle BackColor="White" />
    </asp:GridView>
   </div>

    <div>
    </div>
     <asp:ModalPopupExtender ID="mdpLeaveTypes" runat="server" TargetControlID="hdnLeaveTypes"
        PopupControlID="pnlLeaveTypes"  BackgroundCssClass="modalBackground">
    </asp:ModalPopupExtender>
    <asp:HiddenField runat="server" ID="hdnLeaveTypes" />
    <asp:Panel ID="pnlLeaveTypes" runat="server" Height="28%" Width="31%"  CssClass="PopupPanel">
        <div class="divPopUp" style="height:11%">
         LeaveTypes<asp:ImageButton ImageUrl="~/Images/close.png" runat="server" Height="15px" Width="3%" ImageAlign="Right"
                ID="btnClose" OnClick="btnClose_Click" />
        </div>
        <div align="center">
        <table style="margin-left:1%; margin-top:6%">
        <tr>
        <td align="right">
        <asp:Label ID="lblCode" runat="server" Text="Code:&nbsp;&nbsp;"></asp:Label>
        </td>
        <td align="left" >
        <asp:TextBox ID="txtCode" runat="server"  Width="300px"  ValidationGroup="vchk" ></asp:TextBox>
         <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
        ControlToValidate="txtCode" ErrorMessage="*"
        ValidationGroup="vchk"></asp:RequiredFieldValidator>
        </td>
        </tr>
        <tr>
        <td align="right">
        <asp:Label ID="lblLeaveType" runat="server" Text="Leave Type:&nbsp;&nbsp;"></asp:Label>
        </td>
        <td align="left" >
        <asp:TextBox ID="txtLeaveType" runat="server" Width="300px" ValidationGroup="vchk" ></asp:TextBox>
         <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
        ControlToValidate="txtLeaveType" ErrorMessage="*"
        ValidationGroup="vchk"></asp:RequiredFieldValidator>
        </td>
        </tr>
        <tr>
        <td align="right">
        <asp:Label ID="lblNoOfDays" runat="server" Text="No.Of Days:&nbsp;&nbsp;"></asp:Label>
        </td>
        <td align="left" >
        <asp:TextBox ID="txtNoOfDays" runat="server" Width="300px" ValidationGroup="vchk"
                onkeypress="CheckNumeric(event);" ></asp:TextBox>
          <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
        ControlToValidate="txtNoOfDays" ErrorMessage="*"
        ValidationGroup="vchk"></asp:RequiredFieldValidator>
        </td>
        </tr>
         <tr>
                <td colspan="2" align="right">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 <asp:Button ID="btnSave" runat="server" CssClass="button" Text="Save"
                       Height="24px" Width="55px" OnClick="btnSave_Click" ValidationGroup="vchk"></asp:Button>
                    <asp:Button ID="btnCancel" runat="server" CssClass="button" Text="Cancel"
                       Height="24px" Width="55px" onclick="btnCancel_Click"></asp:Button>&nbsp;&nbsp;&nbsp;
                </td>
            </tr>
        </table>
        </div>
        </asp:Panel>

</asp:Content>

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protected void gvLeaveTypes_RowEditing(object sender, GridViewEditEventArgs e)
{
try
{
int index = e.NewEditIndex;

Label lblLeaveCode = (Label)gvLeaveTypes.Rows[index].FindControl("lblLeaveCode");
Label lbllv_type_id = (Label)gvLeaveTypes.Rows[index].FindControl("lbllv_type_id");
Label lblLeaveType = (Label)gvLeaveTypes.Rows[index].FindControl("lblLeaveType");
Label lblDays = (Label)gvLeaveTypes.Rows[index].FindControl("lblDays");

mdpLeaveTypes.Show();
txtCode.Text = lblLeaveCode.Text;
txtLeaveType.Text = lblLeaveType.Text;
txtNoOfDays.Text = lblDays.Text;

btnSave.Text = "Update";
Session["lv_type_id"] = lbllv_type_id.Text;

}
catch (Exception ex) { }
}
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protected void gvLeaveTypes_RowDeleting(object sender, GridViewDeleteEventArgs e)
{

int index = e.RowIndex;
Label lbllv_type_id = (Label)gvLeaveTypes.Rows[index].FindControl("lbllv_type_id");
Label lblLeaveCode = (Label)gvLeaveTypes.Rows[index].FindControl("lbllv_type_id");
BBEL.lv_type_id = Convert.ToInt32(lbllv_type_id.Text);
BBEL.comp_id = Convert.ToInt16(Session["comp_id"]);

if (BBLL.DeleteLeaveTypes(BBEL) == true)
{

ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "LeaveTypes", "alert('LeaveTypes details deleted successfully');", true);
}
GridFill();


}
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protected void gvLeaveTypes_DataBound(object sender, EventArgs e)
{
GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal);
for (int i = 0; i < gvLeaveTypes.Columns.Count - 2; i++)
{
TableHeaderCell cell = new TableHeaderCell();
TextBox txtSearch = new TextBox();
txtSearch.Attributes["placeholder"] = gvLeaveTypes.Columns[i].HeaderText;
txtSearch.CssClass = "search_textbox";
cell.Controls.Add(txtSearch);
row.Controls.Add(cell);
}
gvLeaveTypes.HeaderRow.Parent.Controls.AddAt(1, row);