Study this example and adapt it to your need:
the aspx page:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default7.aspx.vb" Inherits="Default7" %>
<!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 id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:Label ID="Label1" runat="server" Text="Checkbox"></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</form>
</body>
</html>
the code behind:
Imports System.Data
Partial Class Default7
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
Dim dt As New DataTable()
dt.Columns.Add("Quantity")
dt.Rows.Add("1")
dt.Rows.Add("2")
dt.Rows.Add("3")
dt.Rows.Add("4")
GridView1.DataSource = dt
GridView1.DataBind()
End If
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim sum As Integer = 0
For Each row As GridViewRow In GridView1.Rows
Dim chkbox As CheckBox
chkbox = CType(row.FindControl("CheckBox1"), CheckBox)
If chkbox.Checked Then
sum = sum + row.Cells(1).Text.ToString()
End If
Next
TextBox1.Text = sum
End Sub
End Class
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