#region OneWayHash
      /// 

      /// Encrypts input string
      /// 
      /// string
      /// string
      public string OneWayHash(string input)
      {
         // convert pwd into hashed value //
         HashAlgorithm HA = new SHA1Managed();
         //declare a new encoder
         UTF8Encoding UTF8Encoder = new UTF8Encoding();
         //get byte representation of input text
         byte[] inputBytes = UTF8Encoder.GetBytes(input);
         //hash the input byte array
         byte[] output = HA.ComputeHash(inputBytes);
         //convert output byte array to a string
         string newString  = Convert.ToBase64String(output);
         return newString;
      }
      #endregion