C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;

public class Program
{
	public static void Main()
	{
		string message1 = null;
		if (string.IsNullOrWhiteSpace(message1))
		{
			Console.WriteLine("1) Message 1 is null, or empty, or whitespaces only");
		}
		else
		{
			Console.WriteLine("1) Message 1 is NOT null, or empty, or whitespaces only");
		}

		string message2 = string.Empty;
		if (string.IsNullOrWhiteSpace(message2))
		{
			Console.WriteLine("2) Message 2 is null, or empty, or whitespaces only");
		}
		else
		{
			Console.WriteLine("2) Message 2 is NOT null, or empty, or whitespaces only");
		}

		string message3 = "\t";
		if (string.IsNullOrWhiteSpace(message3))
		{
			Console.WriteLine("3) Message 3 is null, or empty, or whitespaces only");
		}
		else
		{
			Console.WriteLine("3) Message 3 is NOT null, or empty, or whitespaces only");
		}
	}
}

​x
 
using System;
​
public class Program
{
    public static void Main()
    {
        string message1 = null;
        if (string.IsNullOrWhiteSpace(message1))
        {
            Console.WriteLine("1) Message 1 is null, or empty, or whitespaces only");
        }
        else
        {
            Console.WriteLine("1) Message 1 is NOT null, or empty, or whitespaces only");
        }
​
        string message2 = string.Empty;
        if (string.IsNullOrWhiteSpace(message2))
        {
            Console.WriteLine("2) Message 2 is null, or empty, or whitespaces only");
        }
        else
        {
            Console.WriteLine("2) Message 2 is NOT null, or empty, or whitespaces only");
        }
​
        string message3 = "\t";
        if (string.IsNullOrWhiteSpace(message3))
        {
            Console.WriteLine("3) Message 3 is null, or empty, or whitespaces only");
        }
        else
        {
            Console.WriteLine("3) Message 3 is NOT null, or empty, or whitespaces only");
        }
    }
}

*********************************************************
Customers with Orders
Joe  Smith
*************** Orders **************
19.99 - 1

Customers with Orders
Joe  Smith
*************** Orders **************
19.99 - 2
Run-time exception (line 65): Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Stack Trace:

[System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
   at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
   at System.Security.CodeAccessPermission.Demand()
   at System.Console.SetOut(TextWriter newOut)
   at Program.Main(String[] args) :line 65

Last Run:	5:21:01 am
Compile:	0.184s
Execute:	0s
Memory:	227.83kb
CPU:	0s

View IL Code