String Extension functions: Convert strings to and from base64 string

We can write strinf extension function to convert string to base64string and viceversa.

String to Base64String

   public static string ToBase64String(this string value)
        {
            byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(value);
            return System.Convert.ToBase64String(toEncodeAsBytes);
        }

string from Base64String

public static string FromBase64String(this string value)
        {
            byte[] encodedDataAsBytes = System.Convert.FromBase64String(value);
            return System.Text.ASCIIEncoding.ASCII.GetString(encodedDataAsBytes);
        }