How to build a solution or run an asp.net project from a folder containing .aspx.cs, .cs, .config and .css files

NET and C#. I have a fair understanding of executing a web app built on wamp/lamp framework. However here I have the following files for the project (mentioned below). I am unable to figure out how to get the web app running on my local machine.

With wamp/lamp, all we need to do is put the .php file in www root folder and it runs. However here I am clueless on how to proceed.

I have got the IIS running on my local.

The below files are located in this path:

C:\inetpub\wwwroot\Project\code

aboutus.aspx
aboutus.aspx.cs
Accountpage.aspx
Accountpage.aspx.cs
addphotos.aspx
addphotos.aspx.cs
chatid.aspx
chatid.aspx.cs
chatroom.aspx
chatroom.aspx.cs
composemail.aspx
composemail.aspx.cs
confirm.aspx
confirm.aspx.cs
confirmok.aspx
confirmok.aspx.cs
createaccount.aspx
createaccount.aspx.cs
Default2.aspx
Default2.aspx.cs
eo_web.ashx
Faq.aspx
Faq.aspx.cs
file manager.aspx
file manager.aspx.cs
homepage.aspx
homepage.aspx.cs
inbox.aspx
inbox.aspx.cs
login.aspx
login.aspx.cs
registration.aspx
registration.aspx.cs
send sms.aspx
send sms.aspx.cs
StyleSheet.css
uploadfile.aspx
uploadfile.aspx.cs
useraccount.aspx
useraccount.aspx.cs
video.aspx
video.aspx.cs
web.config

But when I point my browser to

http://localhost/Project/code

I get this error:

HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information:

Module IIS Web Core Notification BeginRequest Handler Not yet determined Error Code 0x800700b7 Config Error There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined Config File \?\C:\inetpub\wwwroot\Project\Code\web.config Requested URL http://localhost:80/Project/Code Physical Path C:\inetpub\wwwroot\Project\Code Logon Method Not yet determined Logon User Not yet determined

Config Source:
13:
14:
15:

More Information:
This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.

Please help me get started with this.