How to add ASP.NET 4.0 as Application Pool on IIS 7, Windows 7

Error :-

How to add ASP.NET 4.0 as Application Pool on IIS 7, Windows 7

Solution :-

First make sure you have IIS installed.

Then perform the following steps:

1. Click the Start button .

   In the Search box, type command prompt.

   In the list of results, right-click Command Prompt, and then click Run as administrator.  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
    
2. Type cmd and press ENTER
3. Type cd C:\Windows\Microsoft.NET\Framework\v4.0.30319\ and press ENTER.

4. Type aspnet_regiis.exe -ir and press ENTER again.

   • If this is a fresh version of IIS (no other sites running on it) or you're not worried about the hosted sites breaking with a framework change you can use -i instead of -ir. This will change their AppPools for you and steps 5-on shouldn't be necessary.
   • at this point you will see it begin working on installing .NET's framework in to IIS for you
5. Close the DOS prompt, re-open your start menu and right click Computer and select Manage
6. Expand the left-hand side (Services and Applications) and select Internet Information Services
   • You'll now have a new applet within the content window exclusively for IIS.
7. Expand out your computer and locate the Application Pools node, and select it. (You should now see ASP.NET v4.0 listed)
8. Expand out your Sites node and locate the site you want to modify (select it)
9. To the right you'll notice Basic Settings... just below the Edit Site text. Click this, and a new window should appear
10. Select the .NET 4 AppPool using the Select... button and click ok.

Here You goooo !!