Custom CMS Applications in Asp.net Web Forms / MVC

Rion Williams shared his ideas on Asp.Net forum related to Custom CMS Application in Asp.Net as:

I can't recommend the Orchard CMS enough. It has a tremendous community, an expansive set of modules that cover nearly everything that you can think of and it built completely using .NET, MVC and the Razor View Engine and contains modules for just about everything : 

Common modules include : 

• Responsive Design - one of the core themes is fully responsive for both desktop and mobile interfaces
• Commerce Modules - several are available and you can find a tutorial on building a fully-functional eCommerce site in Orchard here.
• Theming and Ease of Design - since the CMS uses the Razor View Engine, you can easily add nearly any design / layout that you desire.
• Many, Many More Additional Modules 

If you come from a .NET background, I highly suggesting giving it a look (even if it isn't for this project). But, as far as Web Forms specific, you'll likely need to look at one of the following choices :

• Composite C1 - quite highly reviewed
• Umbraco - what this site is running on (ASP.NET)
• N2CMS
• DotNetNuke

Consider trying out each of the above suggestions to see which ones that you prefer and suits your needs the best as with most things there is never a single "perfect" solution.