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);
}