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Introduction

This simple demo project shows, how you can add CheckBoxes to the DataGrid web control. This article shows handling automatic selection and getting the selected CheckBoxes, too.

Select all / Deselect all items

This simple method iterates through the grid and sets the Checked state of the CheckBoxes in the grid. And sets the Button's Caption to + / -.

 Private Sub selectAll()
        Dim oDataGridItem As DataGridItem
        Dim chkExport As System.Web.UI.WebControls.CheckBox

        If cmdSelectAll.Text = "+" Then
            For Each oDataGridItem In dgMain.Items

                chkExport = oDataGridItem.FindControl("chkExport")
                chkExport.Checked = True
            Next

            cmdSelectAll.Text = "-"
        Else
            For Each oDataGridItem In dgMain.Items
                chkExport = oDataGridItem.FindControl("chkExport")
                chkExport.Checked = False
            Next
            cmdSelectAll.Text = "+"
        End If
    End Sub

Find selected Items

This method iterate through the grid items, and adds the selected rows to an array.

    Private Sub cmdFindSelected_Click(ByVal sender As _
                       System.Object, ByVal e As System.EventArgs) _
                       Handles cmdFindSelected.Click

        Dim oDataGridItem As DataGridItem
        Dim chkExport As System.Web.UI.WebControls.CheckBox
        Dim oExArgs As New System.Collections.ArrayList()
        Dim sID As String
        
        For Each oDataGridItem In dgMain.Items

            chkExport = oDataGridItem.FindControl("chkExport")
            If chkExport.Checked Then
                sID = _
                  CType(oDataGridItem.FindControl("lblColumn"), Label).Text
                oExArgs.Add(sID)
            End If
        Next

    End Sub

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Thanks for a clear example how to do this using VB.Net for an ASPX Web Page... Destiny777 13:27 22 May '08   Knew that there had to be a simple solution. Thanks for the help! Sign In·View Thread·PermaLink cmdFindSelected_Click Kathy 9999 7:47 1 Aug '05   First of all, thank you for the article. I tried this code in my project Everything works except If chkExport.Checked Then end if The checkbox that I clicked does not recogizied as checked in code behide. Does anybody run into this problem? Thank again Sign In·View Thread·PermaLink datagrid praveen saini 6:42 7 Mar '05   asp.net using C# i want 2 use checkbox on the datagrid, 4 that i written code bt unable click event not responding 2 to click procedure of the datagrid, pl.let me code 4 this Sign In·View Thread·PermaLink 2.67/5 Re: datagrid YetAnotherGr8Guy 23:38 22 Nov '05   can u giv me the code by which u put the checkbox on the grid? i did try much but i couldnt able for that. thank u. shah h p Sign In·View Thread·PermaLink progressbar datagrid Anonymous 0:25 3 Jun '04   I want add a progressbar to the datagrid, but I have a xml document with the values Sign In·View Thread·PermaLink 1.50/5 Client Side Action for select All Akram Kayani 21:44 18 Sep '03   Your artical was really helpfull but dont you think that there sould be a way check all and un check all check boxes by a client side script so that no round trips are made to the server. If you have a segestion on how to do this let me know. Sign In·View Thread·PermaLink counterpoint Shaun Wilde 11:35 16 Dec '02   This article was posted by cuepack to be a VB version of my C# article http://www.codeproject.com/aspnet/DataGridCheckBox.asp[^]. However the technique used here uses TemplateColumn rather than creating your own module derived from TemplateColumn and shows the other way of creating these sort of grid columns. The advantage of this technique is that it is easier and quicker to create a single one of these columns in this manner - the disadvantage is that it is less portable. Of course the examples given by both are merely examples of how to create your own template column within a DataGrid. I don't know about cuepack but I use both techniques depending on the situation. My most complex version that I use in class form has 4 editable controls in edit mode and is used in over 20 web screens. But most of the time I use the above method. I think that cuepack should have mentioned what he had to do in the .aspx file as this is the part where most beginners fall down. eg this is his code for the .aspx page <asp:TemplateColumn HeaderText="Export"> <HeaderStyle HorizontalAlign="Center" Width="2%"></HeaderStyle> <ItemTemplate> <asp:CheckBox ID="chkExport" Runat="server" /> </ItemTemplate> <EditItemTemplate> <asp:CheckBox ID="chkExportON" Runat="server" Enabled="true" /> </EditItemTemplate> </asp:TemplateColumn> also cuepack hasn't described on how we would bind a boolean field from the database to this checkbox column and I think this is another area that could be expanded to enhance this article. I hope that you find these comments constructive and look forward to your reply. Technically speaking the dictionary would define Visual Basic users as programmers. But here again, a very generalized, liberal definition is being employed and it's wrong - just plain wrong - Tom Archer 5/12/02 Sign In·View Thread·PermaLink 5.00/5 A couple suggestions Marc Clifton 14:52 15 Dec '02   The image in your article should really be cropped. There's a lot of dead whitespace. Your article has one header: Introduction. This doesn't really convey a lot. This doesn't really convey why this technique is useful (in addition to basically demonstrating something built into the .NET environment). Why don't you give us some background as to why you wrote this article, how is your code used in the bigger scope of things, what you learned, etc. You might also want to read: http://www.codeproject.com/useritems/WhatIsAGoodArticle.asp[^] Hope you find this feedback helpful. Marc Help! I'm an AI running around in someone's f*cked up universe simulator. sensitivity and ethnic diversity means celebrating difference, not hiding from it. - Christian Graus Sign In·View Thread·PermaLink 5.00/5 Re: A couple suggestions David Stone 20:03 15 Dec '02   You're gonna do this all the time now aren't you? Well, from the Clickety Police, I now nominate you: The Article Police. All in favor, say "Aye!" I don't know whether it's just the light but I swear the database server gives me dirty looks everytime I wander past. -Chris Maunder Microsoft has reinvented the wheel, this time they made it round. -Peterchen on VS.NET Sign In·View Thread·PermaLink 2.00/5 Re: A couple suggestions Marc Clifton 1:32 16 Dec '02   Hee hee hee. My next great idea, borrowing from those who lead, is to put a link in my sig! Marc Help! I'm an AI running around in someone's f*cked up universe simulator. sensitivity and ethnic diversity means celebrating difference, not hiding from it. - Christian Graus Sign In·View Thread·PermaLink 5.00/5

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