Unable to find checkbox control in Gridview

Question

Hi Friends,

I'm unable find check box control in my webpage.
When building the page I'm getting "checkbox null" and "false".
Can any help me to find the solution.

I'm pasting the code here.

-------------------------------------------------------------------------------------------------------------------
_BigCart.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="_BigCart.ascx.cs" Inherits="_BigCart" %>
<link href="Main.css" rel="stylesheet" type="text/css" />


<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>

<asp:GridView id="gridViewBigCart" Height="118px" AutoGenerateColumns="False" runat="server" CssClass="checkout" Width="615px" DataKeyNames="Quantity" >

<Columns>

<asp:TemplateField HeaderText="Remove">
<ItemTemplate>
<asp:CheckBox ID="checkBoxDelete" runat="server" />
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
<asp:TextBox id="textBoxQuantity" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Quantity")%>' width="40px" Columns="4">
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>

<asp:TemplateField Visible="False">
<ItemTemplate>
<asp:Label id="labelProductID" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ProductID")%>' Visible="False" Width="298px">
</asp:Label>
</ItemTemplate>
</asp:TemplateField>

<asp:BoundField DataField="ProductName" HeaderText="Product Name">
</asp:BoundField>

<asp:BoundField DataField="QuantityPerUnit" HeaderText="Qty Per Unit">
</asp:BoundField>

<asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" DataFormatString="{0:c}">
</asp:BoundField>

<asp:BoundField DataField="TotalDue" HeaderText="Total Due" DataFormatString="{0:c}">
</asp:BoundField>

</Columns>
</asp:GridView>

<asp:Button ID="Button1" runat="server" Text="Update Cart" OnClick="Button1_Click" />
<br />
<asp:Button ID="Button2" runat="server" Text="Proceed To Checkout" />
<br />
<asp:Label ID="labelTotalDue" runat="server"></asp:Label>


<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>


<asp:Label ID="errorMessage" runat="server"></asp:Label>
------------------------------------------------------------------------------------------------------------------

_BigCart.ascx.cs


using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _BigCart : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
GridViewDataBind();
}
protected void GridViewDataBind()
{
string connection = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString.ToString();
string cartId = Request.Cookies["CartID"].Value.ToString();
if (cartId != string.Empty)
{
gridViewBigCart.DataSource = ShoppingCart.GetCart(cartId, connection);
gridViewBigCart.DataBind();
labelTotalDue.Text = "Total Order Amount: " + string.Format("{0:0.00}", ShoppingCart.GetCartSum(cartId, connection));
}
}



protected void Button1_Click(object sender, EventArgs e)
{

string cartID = Request.Cookies["CartID"].Value.ToString();
string connection = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString.ToString();

foreach (GridViewRow gvRow in gridViewBigCart.Rows)
{
if (gvRow.RowType == DataControlRowType.DataRow)
{
CheckBox checkBoxDelete = (CheckBox)gvRow.Cells[0].FindControl("checkBoxDelete");---(Here checkbox 'null' getting)
Label labelProductID = (Label)gvRow.FindControl("labelProductID");
TextBox textBoxCount = (TextBox)gvRow.FindControl("textBoxQuantity");

if (checkBoxDelete != null)
{
if (checkBoxDelete.Checked)---(checkbox 'false' getting)
{
ShoppingCart.RemoveFromCart(int.Parse(labelProduct ID.Text), cartID, connection);
}
}
if (textBoxCount.Text.Trim() == "")
{
ShoppingCart.RemoveFromCart(int.Parse(labelProduct ID.Text), cartID, connection);
}

}

}

}

}