Shopping Cart does read textbox value from gridview

Posted on 2008-06-21
Last Modified: 2013-11-06
I have a gridview with a selection of databound items as well as a textbox and a button, the purpose of the textbox is to allow the user to enter the quantity required and then click on the button which will save the data and show the shopping cart. The textbox is in a itemtemplate tag, and the client doesn't want to select the row (ie edit mode) then add the value.

The problem is I can't get access to the textbox value I either get no value or an "object reference not found error" Surely there is some way of doing this? I have tried various methods ie :-
Dim tmpqty As TextBox = Me.GridView1.SelectedRow.Cells(4).Controls(0)
Dim tmpqty As TextBox = CType(Me.GridView1.FindControl("TextBox1"), TextBox)
in various events BUT NOTHING WORKS HELP!!!

Imports System.Data.SqlClient

Imports System.Data

Partial Public Class OnDemandLine

    Inherits System.Web.UI.Page

    Public cnstring As String

    Private Sub OnDemandLine_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init

    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Select Case Request.Item("t")

            Case "ond"

                CType(Me.Master.FindControl("lblPageTitle"), Label).Text = "On Demand Product Lines"

                ViewState("type") = 3

            Case "bwrk"

                CType(Me.Master.FindControl("lblPageTitle"), Label).Text = "Bespoke Workbooks"

                ViewState("type") = 4

            Case "std", "pblc"

                Response.Redirect("standardproductline.aspx?t=" & Request.Item("t"))

            Case Else

                Response.Redirect("standardproductline.aspx?t=" & Request.Item("t"))

        End Select

        cnstring = ConfigurationManager.ConnectionStrings("Rogensi").ConnectionString

        If Not Me.IsPostBack Then


        End If

    End Sub

    Sub binddata()

        Dim cmd As Data.SqlClient.SqlCommand

        Dim da As New Data.SqlClient.SqlDataAdapter

        Dim ds As New DataSet

        Dim cn As New Data.SqlClient.SqlConnection

        cn.ConnectionString = cnstring

        cmd = New Data.SqlClient.SqlCommand

        cmd.CommandText = "showproductline"

        cmd.CommandType = CommandType.StoredProcedure

        cmd.Connection = cn

        Dim pagep As New SqlParameter("@type", ViewState("type")) 'ViewState("id")) '


        da.SelectCommand = cmd


        Me.GridView1.DataSource = ds.Tables(0)





    End Sub

--------------ASPX page---------------

<%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="~/RogenSi/Site1.Master" CodeBehind="OnDemandLine.aspx.vb" Inherits="RogenSi.OnDemandLine" 

    title="On Product Line" %>

<%@ MasterType VirtualPath="~/RogenSi/Site1.Master" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BorderStyle="None" GridLines="None" HorizontalAlign="Left" DataKeyNames="id">


            <asp:ImageField DataAlternateTextField="title" DataImageUrlField="image" DataImageUrlFormatString="~/siteimages/{0}" HeaderText="Item">

                <ItemStyle Height="50px" Width="50px" />


            <asp:TemplateField HeaderText="Short Description" SortExpression="SDescription">


                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("Title") %>'></asp:Label><br />

                    <asp:Label ID="Label2" runat="server" Text='<%# Bind("SDescription") %>'></asp:Label>



            <asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" SortExpression="UnitPrice" />

            <asp:BoundField DataField="StockLevel" HeaderText="Stock Qty" SortExpression="StockLevel" />

            <asp:TemplateField HeaderText="Order Qty">


                    <asp:TextBox ID="TextBox1" runat="server" Width="50px"></asp:TextBox>



            <asp:ButtonField ButtonType="Button" CommandName="select" Text="ADD" />

            <asp:BoundField DataField="LeadTime" HeaderText="LeadTime" SortExpression="LeadTime" Visible="False" />

            <asp:BoundField DataField="id" HeaderText="id" InsertVisible="False" ReadOnly="True"

                SortExpression="id" Visible="False" />

            <asp:BoundField DataField="ProductType" HeaderText="ProductType" SortExpression="ProductType"

                Visible="False" />

            <asp:BoundField DataField="ReStockLevel" HeaderText="ReStockLevel" SortExpression="ReStockLevel" Visible="False" />



            Sorry there is no data for this category


    </asp:GridView><br />

    <asp:Label ID="Label3" runat="server" Text="Label4"></asp:Label>


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Question by:markej
  • 3

Accepted Solution

kGenius earned 500 total points
Comment Utility
Make sure the row is selected before searching for the textbox.
Then in the SelectedIndexChanged event of your gridview add
Dim tmpqty As TextBox = CType(e.row(index).FindControl("TextBox1"), TextBox)

(hope the syntax is correct, as I never use VB)


Author Comment

Comment Utility
How do I select the Row, The only selection type control is the "add" button?

Author Comment

Comment Utility
The actual syntax is this and it seems to work So Thanks!


Private Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.SelectedIndexChanged

        Dim tmpqty As TextBox = CType(Me.GridView1.SelectedRow.FindControl("TextBox1"), TextBox)
        Response.Redirect("orderdetail.aspx?qty=" & tmpqty.Text)
End Sub

Author Closing Comment

Comment Utility
Thanks for the soln, the syntax was slightly out BUT you gave me the correct pointer/idea


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