private string encryptString(string strToEncrypt)
{
  System.Text.UTF8Encoding ue = new System.Text.UTF8Encoding();
  byte[] bytes = ue.GetBytes(strToEncrypt);
  
  // encrypt bytes
  System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
  byte[] hashBytes = md5.ComputeHash(bytes);
  
  // Convert the encrypted bytes back to a string (base 16)
  string hashString = "";
  
  for(int i=0;i<hashBytes.Length;i++)
  {
    hashString += Convert.ToString(hashBytes[i],16).PadLeft(2,'0');
  }
  
  return hashString.PadLeft(32,'0');
}