Question

I am trying to get customerId from Customer table.

However, when I try to make it, it has error said, ‘Cannot implicitly convert type ‘System.Linq.Iqueryable’ to ‘int”

How can I get customerId??

Thank you.

Here is my coding.

int customerId = from a in db.Customer
                            where a.userName == customerName
                            select a.customerId; 
                           //it has error in here.

order.customerId = customerId;

Answer 1

It’s possible that your query could return multiple rows. You need to tell LINQ that you only want the first (or a single) result:

int customerId = (from a in db.Customer
                  where a.userName == customerName
                  select a.customerId).First();