ASP.Net Create Two Models With One Controller

I'm just trying To create one controller that will work with two models. Comment Model:

 public class Comment
 {
    public int ID { get; set; } // property
    public int PostID { get; set; }
    public String Title { get; set; }
    public String Name { get; set; }
    public Uri Url { get; set; }
    public String Text { get; set; }
    public Post Post { get; set; }
}

public class CommentDBContext : DbContext 
{
    public DbSet<Comment> Comments { get; set; }

    public System.Data.Entity.DbSet<BlogShauli.Models.Post> Posts { get; set; }

}

Post Model:

  public class Post
  {
    public int ID { get; set; } // property
    public String Title { get; set; }
    public String Author { get; set; }
    public String AuthorSite { get; set; }
    public DateTime ReleaseDate { get; set; }
    public String Text { get; set; }
 }

public class PostDBContext : DbContext
{
    public DbSet<Post> Posts { get; set; }
}

And now I want to create a Single Controller that will work with both models. I read that the way to do it is to use ViewModel Pattern so i created one more model class named "BlogViewModel.cs", with the following code:

public class MotorcycleViewModel
 {
     public Comment CommentPointer { get; set; }
     public Post PostPointer { get; set; }
 }

But from here i didn't understand what do. i'm trying to create a new Controller using Entity framework but i don't know what to select in the "Data context class". can someone would explain me how to make the connection between Both models and the Controller? Thanks!