It is possible to write only WriteLine instead of Console.WriteLine in C#?

Try using static directive:

 using static System.Console;

 ...

 WriteLine("some text");

Starting with C# 6.0, this is possible:

using static System.Console;

However, previous versions of C# do not have static imports.

You can use an Action:

Action<string> WriteLine = (text) => Console.WriteLine(text);