OnDoc/Client/Helper/Strings.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OnDoc.Helper
{
    public static class Strings
    {
        public static string Right(this string value, int length)
        {
            if (String.IsNullOrEmpty(value)) return string.Empty;

            return value.Length <= length ? value : value.Substring(value.Length - length);
        }

        public static string Left(this string value, int maxLength)
        {
            if (string.IsNullOrEmpty(value)) return value;
            maxLength = Math.Abs(maxLength);

            return (value.Length <= maxLength
                   ? value
                   : value.Substring(0, maxLength)
                   );
        }
        public static string Base64Encode(string plainText)
        {
            var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
            return System.Convert.ToBase64String(plainTextBytes);
        }
        public static string Base64Decode(string base64EncodedData)
        {
            var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData);
            return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
        }
    }
}