How set default page in iis for Asp.net application

There are two ways to be set default page for application.One way is adding the default document to configuration file(web.config).Other way is directly set the default document in IIS

<system.webServer>
    <defaultDocument>
        <files>
            <add value="~/OrdsrHome.aspx"/>
        </files>
    </defaultDocument>
</system.webServer>

Configure in IIS :
Click on application -->go to Features view then do the below process as per screen shots

The default Page has been set to application as you can see in the above image
 

how to install IIS webserver in asp.net

The asp.net is server side web specification .In the asp.net we can work with IIS web server.The web server maintains collection of proxy machines ,very flexibility depending on the request ,the we service gives the response,The total application control by web server.Web server having the virtual memory

start-->settings-->control panel-->add remove program-->windows components-->click on the this available one component IIS-->click on next
Web server features are not getting with operating system,manually we have to install IIS Webserver.

Installing IIS web server:

To install the web server go to add remove programs by click on the start menu-->settings-->control panel->add remove program--> add windows components-->getting list of components from the operating system.

From the list of components select Internet Information Service check box .Click on the next button ,web server is installed