Hello! friends

I am new to C sharp programming language. When I execute the below written
code I get error:

using System;
class Hello
static void Main() {
Console.WriteLine("Hello, world");

I save the above code as hello.cs.

When I compile the following code at DOS prompt:

csc hello.cs

I get no error message and hello.exe should be generated, but I can't find

Please help regarding this matter......