--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Demo/Asp.Net/Web/App_Code/WebUtility.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,59 @@
+using System;
+using System.Text.RegularExpressions;
+using System.Web;
+using System.Web.Caching;
+using System.Configuration;
+
+using PetShop.BusinessLogic;
+
+namespace PetShop.Web
+{
+	/// <summary>
+	/// Collection of utility methods for web tier
+	/// </summary>
+	public static class WebUtility
+	{
+		/// <summary>
+		/// Method to make sure that user's inputs are not malicious
+		/// </summary>
+		/// <param name="text">User's Input</param>
+		/// <param name="maxLength">Maximum length of input</param>
+		/// <returns>The cleaned up version of the input</returns>
+		public static string InputText(string text, int maxLength)
+		{
+			text = text.Trim();
+
+			if (string.IsNullOrEmpty(text))
+				return string.Empty;
+
+			text = Regex.Replace(text, "[\\s]{2,}", " ");                             // two or more spaces
+			text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n"); // <br>
+			text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " ");     // &nbsp;
+			text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty);                  // any other tags
+			text = text.Replace("'", "''");
+
+			if (text.Length > maxLength)
+				text = text.Substring(0, maxLength);
+
+			return text;
+		}
+
+		/// <summary>
+		/// Method to check whether input has other characters than numbers
+		/// </summary>
+		public static string CleanNonWord(string text)
+		{
+			return Regex.Replace(text, "\\W", "");
+		}
+
+		/// <summary>
+		/// Method to redirect user to search page
+		/// </summary>
+		/// <param name="key">Search keyword</param> 
+		public static void SearchRedirect(string key)
+		{
+			HttpContext.Current.Response.Redirect(
+				string.Format("~/Search.aspx?keywords={0}", InputText(key, 255)));
+		}
+	}
+}