create a textbox and default all colours to white (or whatever you need to hide). Create an event for OnSelectionChange on the calendar control.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ValidateCalControl.aspx.cs"
Inherits="ValidateCalControl" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Calendar ID="Cal1" runat="server"
OnSelectionChanged="Cal1_SelectionChanged"></asp:Calendar>
<asp:TextBox ID="txtCal" runat="server" BackColor="White" BorderColor="white"
ForeColor="white"></asp:TextBox>
<asp:RequiredFieldValidator ID="Req1" runat="server"
ControlToValidate="txtCal" ErrorMessage="Select Date"></asp:RequiredFieldValidator>
<asp:Button ID="btnTest" runat="server" Text="Test" />
</div>
</form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class ValidateCalControl : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Cal1_SelectionChanged(object sender, EventArgs e)
{
txtCal.Text = Cal1.SelectedDate.ToShortDateString();
Req1.Validate();
}
}