how to get the value of dataGrid in Detailview

I have a form in which i am using dataGrid to acess the data from the database.
Now on clicking the button a new Detailview page is open in which i want to retrieve value according to the button in which click.


My Default.aspx coding is


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    
    <link href="StyleSheet.css" rel="stylesheet" type="text/css&q ...