Q:

windows form .. console.writeline() where is console?

I created a windows form solution and in the constructor of a class I called 
Console.WriteLine("constructer called")
But I only got the form and not the console.. so where is the output?

A:

In project settings set application type as Console. Then you will get console window and Windows form.

A:

You should also consider using Debug.WriteLine, that's probably what you're looking for. These statements are written out the trace listeners for your application, and can be viewed in the Output Window of Visual Studio.
Debug.WriteLine("constructor fired");

A:

If you run your application in Visual Studio you can see the console output in the output window.

Debug -> Windows -> Output

Note that the preferable way to output diagnostics data from a WinForms application is to use System.Diagnostics.Debug.WriteLine or System.Diagnostics.Trace.WriteLine as they are more configurable how and where you want the output.

