Mask TextBox ASP.NET Control

using System;
using Controls;

namespace Mtb
{
	public class Default: System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button btnSubmit;
		protected MaskTextBox maskTextBox, maskTextBox1;

		private void Page_Load(object sender, EventArgs e)
		{
			if (!IsPostBack)
			{
				//For maskTextBox see InputMask="NA-ANNA-NNNANNN-NAN" in the asp script, used instead of:
				//maskTextBox.Initialize("NA-ANNA-NNNANNN-NAN");
								
				maskTextBox1.Initialize("NNNN-NNNN-NNNN-NNNN");
			}
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}