c# - Switching EF connection strings at runtime -


i know question has been asked , answered few times already, every answer have encountered has either been incomplete, overly vague or assumes more prerequisite knowledge have. seeking step-by-step instructions, in reasonably plain english, swap out database in default connection string database name looked in table. keep coming across snippet of code...

    public dfdbentities(string connectionstring)          : base(connectionstring)     {      }

...but no 1 explains how, , where, implement it. assuming have class called "db" represents datamodel.edmx model... 

    private datamodel db = new datamodel();

...how change connection string associated class point different physical database (with identical data structure)?

by using default constructor saying "i want use default connection string" specified in web.config.

the dbcontext has constructor overload allows override default connection string, need pass in

db = new datamodel("myconnectionstr");

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