Get value from Database Table

Hello and thanks for reading this.
Here is my Database Table:

Here is the Using Code with Entity Framework:
using (KONE_Entities db = new KONE_Entities()) { //Code here } Both UserID and Survey ID comes from a session.
Session["UserID"] And Session["SurveyID"]
How can I find the ID from the table where UserID and Survey ID is Equal to something in a row then it returns the ID.
So if UserID is 3 and SurveyID is 1 then the Code will return ID 3

Thanks for your help