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