How To Add Master Page And Content Page In Asp.Net (Part 2/2)
Before continuing please visit Add Master Page In Asp.Net Web Application.
Here we consider about adding Content Page in Asp.Net Web Application.
Now Right Click on the Project Icon and Select Add --> Add New Item
Select Web Form Using Master Page from the new window as shown below

Name it with a preffered Name and click Add Button.
Now Select the Master Page from the list of Master Pages from the new window.

This will add the Content Page in the Solution as shown below.

The Content Page contains only Contentplacholders that are placed from the Master Page.
New things should be added inside the Contentplacholders.
By this way we can Add Content Page In Asp.Net Web Application.