Querying using Entity Framework

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C#

C#4.0

entity-framework

How to query an entity that is mapped to the corresponding database table to retrieve some data?

I have a User entity which OR mapped to the database table User, which attributes userID and username.

Now, I wanted to know what are the possible ways to retrieve the the UserName by providing the userID.

I tried using the following code , but I dont understand why is it displaying an error that the datacontext does not exist.

var CurrentUserName = from c in datacontext.user
                      where c.UserID == someUserID
                      select c.Name;