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Open Visual Studio in Administrator Mode, then Debug -> attach to process -> tick the check box "Show processes from all user", select w3wp.exe.
Via the Windows Task Manager, you can see processes named w3wp.exe. Within the IIS management console, you can view more details. Open IIS manager and on the left side click on the name of your computer. You will then see a similar list of icons on the right as shown in the screenshot below.
Open the Windows Task Manager, ensure that the PID and Command Line columns are shown on the screen. For all w3wp.exe processes, check the value of the Command Line argument. Find the w3wp.exe process that has the target application pool name mentioned in the Command Line column.
“An Internet Information Services (IIS) worker process is a Windows process (w3wp.exe) which runs web applications, and is responsible for handling requests sent to a web Server for a specific application pool.”
w3wp.exe won't show in the running process' unless there is actually an instance of the web application running.
Try to access your web page first, when it is displayed for the first time, try to attach your debugger. The process should now show up.
You need to click Show Processes from All Users at the bottom of the Task Manager list. This is what i needed to do.
Try to check on :"Show Processes for All Users" When on the 'Attach to Process' window in the bottom left there is a checkbox 'Show Processes for All Users'
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