// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002075/string-decodebase64

​

// @nuget: Z.ExtensionMethods

​

using System;

​

public class Program

{

    public static void Main()

    {

        string str = "RW50aXR5RnJhbWV3b3Jr";

​

        // C# Extension Method: String - DecodeBase64

        string decodeBase64 = str.DecodeBase64();

        Console.WriteLine(decodeBase64);

    }

}