using (var ctx = new SchoolDBEntities())
{
    var studentName = ctx.Students.SqlQuery("Select studentid, studentname, standardId from Student where studentname='Bill'").FirstOrDefault();
}    
//https://www.entityframeworktutorial.net/Querying-with-EDM.aspx
//https://www.entityframeworktutorial.net/EntityFramework4.3/raw-sql-query-in-entity-framework.aspx