Int.Parse in Linq Expression

Question

I have the following LINQ expression. I want calculate the sum of numeric values in an nvarchar field. I\'m using following code to do this, but I get an error

Answer 1

There is a badly built database, which I cannot edit, but have to use it.

I use this in Linq-To-Sql and it works.

First cast the string to object, then cast it to int.

 from s in db.Students
 select new
 {
     s.Name,
     s.Surname,
     Birthday = new DateTime((int)(object)(s.dateStr.Substring(0, 4)),
                             (int)(object)(s.dateStr.Substring(4, 2)),
                             (int)(object)(s.dateStr.Substring(6, 2))),
 }