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<asp:CheckBox runat='server' id='chkbox'></asp:CheckBox>
<asp:CustomValidator runat='server' ErrorMessage='Error!' OnServerValidate='ServerValidation' ClientValidationFunction='ClientValidation'
		ID='Customvalidator1' />
<asp:Button runat='server' text='submit' ID='Button1' />

<script language='javascript'> 
function ClientValidation(source, args) 
{ 
	args.IsValid = document.all['chkbox'].checked; 
} 
</script>

VB.NET


<script runat='server' language='vb'> 
sub ServerValidation( source as object, args as ServerValidateEventArgs ) 
	args.IsValid = chkbox.Checked 
end sub 
</script>

C#


<script runat='server' language='cs'> 
void ServerValidation(object source, ServerValidateEventArgs args) 
{ 
	args.IsValid = chkbox.Checked; 
} 
</script>
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<asp:CheckBox id='chkTips' style='Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 64px' runat='server'
	Text='Tips'></asp:CheckBox>
<asp:CheckBox id='chkTricks' style='Z-INDEX: 102; LEFT: 32px; POSITION: absolute; TOP: 112px'
	runat='server' Text='Tricks'></asp:CheckBox>
<asp:CheckBox id='chkFaqs' style='Z-INDEX: 103; LEFT: 32px; POSITION: absolute; TOP: 160px' runat='server'
	Text='Faqs'></asp:CheckBox>
<asp:Button id='btnSelect' style='Z-INDEX: 104; LEFT: 40px; POSITION: absolute; TOP: 224px'
	runat='server' Text='Select'></asp:Button>

VB.NET


Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
’Put user code to initialize the page here
	If Not Page.IsPostBack Then
	End If
End Sub

Private Sub btnSelect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSelect.Click
	Dim ctl As Control
	Dim strchkSelected As String
	For Each ctl In Page.Controls(1).Controls
		If TypeOf ctl Is CheckBox Then
			if CType(ctl, CheckBox).Checked Then
				strchkSelected += CType(ctl, CheckBox).Text + ' '
		                End If
		End If
	Next
	Response.Write(strchkSelected)
End Sub

C#


private void Page_Load(object sender, System.EventArgs e)
{
	// Put user code to initialize the page here
	if (!Page.IsPostBack )
	{
	}
}

private void btnSelect_Click(object sender, System.EventArgs e)
{
	string strchkSelected='' ;
	foreach (Control ctl in Page.Controls[1].Controls )
	{
		CheckBox chk = ctl as CheckBox ;
		if (chk!=null)
		{
			if (chk.Checked )
			{
				strchkSelected += chk.Text + ' '  ;
			}
		}
	}
	Response.Write (strchkSelected);
}
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