title: Using both MongoDB and SQL Server Express with Asp.net MVC
body: <p>I am building a website with Asp.Net MVC 4 and C#, hosted in VPS. The site has lots of sharing comments/replies features (I need to store a lot of comments). I was planning to use MongoDB as its free and also very suitable for storing blogs/comments, but got a little hesitant <a href="http://blog.engineering.kiip.me/tagged/riak/chrono" rel="nofollow">after I read this article</a>.</p>
  
  <p>So now I am thinking of using MongoDb for storing comments and replies and  SQL Server Express version with 10GB limitation for storing user accounts and other user profile data.</p>
  
  <p>Is it okay to use 2 different databases like this in one web app? Or is there any other stable documents database similar to MongoDb that I can use and don't have to use SQL server ?
  Is RavenDb an option ?
  Thanks in advance !</p>