public class EncryptHelpr
{
    private static readonly string key = "a1234567";
    private static readonly string iv = "a1234567";

    public static string Encrypt(string data)
    {
        string result = string.Empty;
        byte[] bytes = Encoding.UTF8.GetBytes(data);
        DESCryptoServiceProvider provider = new DESCryptoServiceProvider() 
        { 
            Key = Encoding.ASCII.GetBytes(key), 
            IV = Encoding.ASCII.GetBytes(iv)
        };
        using (MemoryStream memory = new MemoryStream())
        {
            using (CryptoStream crypto = new CryptoStream(memory, provider.CreateEncryptor(), CryptoStreamMode.Write))
            {
                crypto.Write(bytes, 0, bytes.Length);                    
            }
            //result = Convert.ToBase64String(memory.ToArray());
            result = Encoding.UTF8.GetString(memory.ToArray());
                
        }
        return result;
    }

    public static string Decrypt(string data)
    {
        string result = string.Empty;
        //byte[] bytes = Convert.FromBase64String(data);
        byte[] bytes = Encoding.UTF8.GetBytes(data);
        DESCryptoServiceProvider provider = new DESCryptoServiceProvider()
        {
            Key = Encoding.ASCII.GetBytes(key),
            IV = Encoding.ASCII.GetBytes(iv)
        };
        using (MemoryStream memory = new MemoryStream())
        {
            using (CryptoStream crypto = new CryptoStream(memory, provider.CreateDecryptor(), CryptoStreamMode.Write))
            {
                crypto.Write(bytes, 0, bytes.Length);
            }
            result = Encoding.UTF8.GetString(memory.ToArray());
        }
        return result;
    }
}