title: How can i write SQL update query with where clause in Entity Framework in C#
body: <p>I know that for update a model in EF i must get model then change it then dbContext.SaveChanges()
  but sometimes in my Asp.net mvc project , i want update a field in my table and i don't know it 's id  and must be get it with where clause.
  but i don't want connect twice to database , because in ADO.net i can write:</p>
  
  <pre><code>UPDATE MyTable SET Field3 = "NewValue" WHERE Active = 1 
  </code></pre>
  
  <p>and now i want write a linq to sql for EF that work like that.
  Is exist any way for that?
  thanks</p>