Try Like this .This may help you.
In ASPX:
<<pre lang="ASP.NET">%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplicationGridview._Default" %>
<asp:Content runat="server" ID="FeaturedContent" ContentPlaceHolderID="FeaturedContent">
<section class="featured">
<div class="content-wrapper">
<hgroup class="title">
<h1><%: Title %>.</h1>
<h2>Modify this template to jump-start your ASP.NET application.</h2>
</hgroup>
<p>
To learn more about ASP.NET, visit <a href="http://asp.net" title="ASP.NET Website">http://asp.net</a>.
The page features <mark>videos, tutorials, and samples</mark> to help you get the most from ASP.NET.
If you have any questions about ASP.NET visit
<a href="http://forums.asp.net/18.aspx" title="ASP.NET Forum">our forums</a>.
</p>
</div>
</section>
</asp:Content>
<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent">
<asp:GridView ID="gdv" AutoGenerateColumns="false" runat="server" OnRowCommand="gdv_RowCommand">
<Columns>
<asp:BoundField HeaderText="ID" DataField="Id" />
<asp:TemplateField>
<ItemTemplate>
<asp:TextBox ID="txtToDo" runat="server" Text='<%# Eval("ToDo")%>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="IsDone" runat="server" Checked='<%# Eval("IsDone")%>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="btnShow" Text="Show" runat="server" OnClick="btnShow_Click"
/>
<asp:Label ID="lblSelected" runat="server"></asp:Label>
</asp:Content>
In code behind(C#)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplicationGridview
{
public partial class _Default : Page
{
EF_TestDBEntities db = new EF_TestDBEntities();
protected void Page_Load(object sender, EventArgs e)
{
List<todos> lstToDos = new List<todos>();
lstToDos = db.ToDos.ToList();
gdv.DataSource = lstToDos;
gdv.DataBind();
}
protected void gdv_RowCommand(object sender, GridViewCommandEventArgs e)
{
}
protected void btnShow_Click(object sender, EventArgs e)
{
string selectedID = "";
foreach (GridViewRow row in gdv.Rows)
{
CheckBox chk = (CheckBox)row.FindControl("IsDone"); //this way you can also get the value of a textbox in the row
TextBox txtToDo = (TextBox)row.FindControl("txtToDo");
if (chk.Checked)
{
selectedID += "id="+row.Cells[0].Text + ",ToDo="+txtToDo.Text;
}
}
lblSelected.Text = selectedID;
}
}
}
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