C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;

BaseClass a = new DerivedClass();
a.SayHello();
DerivedClass b = new DerivedClass();
b.SayHello();
					
public class BaseClass
{
	public void SayHello()
	{
		Console.WriteLine("Hello world!");
	}
}

public class DerivedClass : BaseClass
{
	public void SayHello()
	{
		Console.WriteLine("Hello Artem!");
	}
}

​x
 
using System;
​
BaseClass a = new DerivedClass();
a.SayHello();
DerivedClass b = new DerivedClass();
b.SayHello();
                    
public class BaseClass
{
    public void SayHello()
    {
        Console.WriteLine("Hello world!");
    }
}
​
public class DerivedClass : BaseClass
{
    public void SayHello()
    {
        Console.WriteLine("Hello Artem!");
    }
}

Compilation error (line 24, col 1): Keyword, identifier, or string expected after verbatim specifier: @
Compilation error (line 1, col 9): Expected class, delegate, enum, interface, or struct
Compilation error (line 5, col 25): Expected class, delegate, enum, interface, or struct
Compilation error (line 18, col 47): Expected class, delegate, enum, interface, or struct
Compilation error (line 18, col 70): Type or namespace definition, or end-of-file expected

Last Run:	10:58:17 pm
Compile:	0s
Execute:	0.078s
Memory:	0b
CPU:	0s

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