ASP.NET

minhpc_bk wrote:

And you can do in the common way that many other sites do

blurMember wrote:

But I was wondering how they do it?
Is there any sample link?

CheckBoxList2.Items.Add(GridView1.Columns(listItemCount).ToString)

Protected Sub btnUpdate_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim li As ListItem
    Dim liNum As Integer = -1
    Dim colNum As Integer = -1
    For Each li In CheckBoxList2.Items
        liNum += 1
        colNum += 1
        Select Case li.Value
            Case liNum
                If li.Selected Then
                    GridView1.Columns(colNum).Visible = False
                Else : GridView1.Columns(colNum).Visible = True
                End If
        End Select
    Next
End Sub

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim listItemCount As Integer = -1
    Dim totalColNum As Integer = GridView1.Columns.Count
    Dim valNum As Integer = -1
    totalColNum = totalColNum - 5
    If Not Page.IsPostBack Then
        While listItemCount <= totalColNum
            listItemCount += 1
            valNum += 1
            CheckBoxList2.Items.Add(GridView1.Columns(listItemCount).ToString)
            CheckBoxList2.Items.Item(listItemCount).Value = valNum.ToString
        End While
    End If
End Sub

CheckBoxList2.Items.Item(listItemCount).Value = valNum.ToString