#if (DEBUG) is not working in the customized base class libraries

Question

I create a Windows application in VS 2010 C#. It is a web crawler application and using the N tier application structure (One Windows application and many class libraries in this project). Last week i implement a Log system in all projects for creating log text for solve performance issues. But now i want to disable this log functions in Release Mode.

I googled and get a example from CodeProject. Please see my code below.

public class ModeDetector
{
    public virtual bool IsDebug
    {
        get
        {
            bool isDebug = false;

            #if (DEBUG)
            isDebug = true;
            #else
            isDebug = false;
            #endif

            return isDebug;
        }
    }

    public bool IsRelease
    {
        get { return !IsDebug; }
    }
}

I create this class in my base class library. for get this class for all reference projects. I call this method in my Windows application. like

if (new Sun.lib.ModeDetector().IsDebug)
            MessageBox.Show("Debug Mode");
        else
            MessageBox.Show("Release Mode");

and change my project Build Configuration to " Release " . But this code is always shows the " Debug Mode " message. But when i create this class in my windows application it's works fine. But i am too worry about to create this class in every project.

Please advise me what is the best practices to determine a project(s) is work debug or release mode. How can i use this class in entire project.

Edits :

I refer the class library in the Debug bug folder of class library project.

my class libraries and win forms applications are lie on the same solutions.

Answer 1

Thank you Marcus. I follow your instruction and rewrite my code like:

#if (DEBUG) 

    MessageBox.Show("Debug Mode");

#else

    MessageBox.Show("Release Mode");

#endif