If you're using Visual Studio 2005, you can add the .ico/.png file in the C#
project through the Project Designer.
1. Go to Solution Explorer and Right click the project item and choose Properties.
2. In the Project Designer, switch to the Application tab.
3. Select the option button 'Icon' in the Resources group and click the
button on the right to browse to your .ico file
4. After that save and build the project.
5. Now inside bin\debug u will get the project .exe file with your icon.