SharePoint 2013 Default css path

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\TEMPLATE\LAYOUTS\1033\STYLES\Themable

In this folder , corev15.css is the default css for the SharePoint site.

LINQ Crud Operation With Entity Framwork

                   
Insert the record :

EntityDB dataBase = new EntityDB();
Customer c = new Customer
{
     Name = "Test",
     Gender = "Male
};
dataBase.Customers.AddObject(c);
dataBase.SaveChanges();

Delete the record : 

Customer c = (from x in dataBase.Customers

             where x.Name == "Test"
             selext x).First();
dataBase.Customers.DeleteObject(c);
dataBase.SaveChanges();

Update the Record : 

Customer c = (from x in dataBase.Customers

             where x.Name == "Test"
             selext x).First();
c.Name = "New Name";
dataBase.SaveChanges();