public static void AddStudent(string Name)
{
Students student = new Students();
student.Name = Name;
//add a student
using (var newStudent = new KeithEntityModelContainer()) {
newStudent.Students.Add(student);
newStudent.SaveChanges();
}
}
public static void DeleteStudent(string Name)
{
Students studentToDelete;
//1. Get student from DB
using (var ctx = new KeithEntityModelContainer()) {
studentToDelete = ctx.Students.Where(s => s.Name == Name).FirstOrDefault <Students>();
}
//Create new context for disconnected scenario
using (var newContext = new KeithEntityModelContainer()) {
newContext.Entry(studentToDelete).State = System.Data.Entity.EntityState.Deleted;
newContext.SaveChanges();
}
}
public static void UpdateStudent(string OldName, string NewName)
{
Students student;
//1.Get student from DB
using (var entityModel = new KeithEntityModelContainer()) {
student = entityModel.Students.Where(s => s.Name == OldName).FirstOrDefault <Students>();
}
//2.change student name
if (student != null)
{
student.Name = NewName;
}
//3.save entity
using (var entityModel = new KeithEntityModelContainer()) {
//a. Mark as modified
entityModel.Entry(student).State = System.Data.Entity.EntityState.Modified;
//b. save changes
entityModel.SaveChanges();
}
}
