Add a Checkbox Control to the DataGrid Control

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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