In order to debug the application that is run in IIS Express in visual studio, following are the steps 1. Run the application /s in IIS express configured in visual studio 2. In the system tray or task bar near by the system clock, IIS express icon will be shown. Click on it and click on "show all application" 3. All the application hosted in IIS express will be shown along with the corresponding process ids. 4. In visual studio, go to Tools > Attach to process > in the processes, order by the process I'd and choose the correct process I'd to debug the application. 5. If the process is not listed there, pick on the "show process from all user account" check box in the bottom left corner of the window. 6. Leave a break point in the source and that's it. Hope this helps.
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