using System;

using System.Runtime.CompilerServices;

​

public class Program

{

    public static void Main()

    {

        TestMethod("Hello");

        TestMethod(null);

        TestMethod("");

    }

​

    static void TestMethod(string inputValue)

    {

        inputValue.ThrowIfNullOrEmpty();

        Console.WriteLine("Got: " + inputValue);

    }

}

​

public static class Ext

{

    public static void ThrowIfNullOrEmpty(

        this string value, 

        [CallerArgumentExpression("value")] string expression = null)

    {

        if (string.IsNullOrEmpty(value))

        {

            throw new ArgumentException(paramName: expression, message: $"{expression} cannot be null or empty!");

        }

    }

}