private static string EncryptDate(string d)
{
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(d.ToString());
byte[] numArray = (new SHA256Managed()).ComputeHash(bytes);
string str = string.Concat(d.ToString(), ";", PDFHelper.ByteArrayToString(numArray));
byte[] bytes1 = System.Text.Encoding.ASCII.GetBytes(str);
char[] chrArray = new char[] { '=' };
return(Convert.ToBase64String(bytes1).TrimEnd(chrArray));
}
