In this section, we will discuss how you can use ObjectServices to add, modify, and delete an object within an ObjectContext.
To add an object to the ObjectContext requires the use of the AddObject method. It accepts the entity set name and entity instance as parameters and adds the object passed to it to the ObjectContext. Once you have added an object to the ObjectContext, you can call the SaveChanges to persist the changes to the database.
Here is an example that shows how you can add an object to the ObjectContext and then call the SaveChanges method to persist the changes to the database:
PayrollModel.PayrollEntities ctx = new PayrollModel.PayrollEntities(); PayrollModel.Employee employee = new PayrollModel.Employee(); employee.EmployeeID = 16; employee.EmployeeName = "Debanjan Banerjee"; employee.EmployeeAddress = "Kolkata"; employee.JoiningDate = DateTime.Now; employee.Department = ctx.Department. Where(d => d.DepartmentID == 3).First(); ctx...