Use is in Console.WriteLine : is « Operator « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Operator
3. is

using System;

public class MainClass
{
    static void Main() {
        String derivedObj = "Dummy";
        Object baseObj1 = new Object();
        Object baseObj2 = derivedObj;

        Console.WriteLine( "baseObj2 {0} String", baseObj2 is String ? "is" : "isnot" );
        Console.WriteLine( "baseObj1 {0} String", baseObj1 is String ? "is" : "isnot" );
        Console.WriteLine( "derivedObj {0} Object", derivedObj is Object ? "is" : "isnot" );

    }
}

baseObj2 is String
baseObj1 isnot String
derivedObj is Object