public static void DeleteCustomer(NORTHWNDEntities dataBase)
{
var customer = dataBase.Customers
.Where(c => c.CustomerID == "ABGRT")
.FirstOrDefault();
dataBase.Customers.Remove(customer);
dataBase.SaveChanges();
}
public static void ModifyCustomer(NORTHWNDEntities dataBase)
{
// selecting the new inserted customer entry to modify it
var customer = dataBase.Customers
.Where(c => c.CustomerID == "ABGRT")
.FirstOrDefault();
customer.ContactName = "Miroslav Ivanov";
dataBase.SaveChanges();
}
public static void InsertNewCustomer(NORTHWNDEntities dataBase)
{
var newCustomer = new Customer
{
CustomerID = "ABGRT",
CompanyName = "Nike",
ContactName = "Miroslav Andonov",
ContactTitle = "Owner",
Address = "Mladost 4",
City = "Sofia",
Region = "Sofia",
PostalCode = "1612",
Country = "Bulgaria",
Phone = "3-432-213-4",
Fax = "3-324-213-12",
};
dataBase.Customers.Add(newCustomer);
dataBase.SaveChanges();
}
static void Main()
{
// creating one of the database contexts used to simulate the multithreading
using (var firstDataBase = new NORTHWNDEntities())
{
// selecting the first employee
var employee = firstDataBase.Employees.FirstOrDefault();
// changing the employee's country to Bulgaria
employee.Country = "Bulgaria";
//creating the second database
using (var secondDataBase = new NORTHWNDEntities())
{
// selecting the first employee again
var employeeSecond = secondDataBase.Employees.FirstOrDefault();
// changing the employee's country to England
employee.Country = "England";
secondDataBase.SaveChanges();
} // here the second connection is closed
firstDataBase.SaveChanges();
}// first connection is closed
// show the actual result
using (var dbToShowResult = new NORTHWNDEntities())
{
var result = dbToShowResult.Employees.FirstOrDefault();
Console.WriteLine("The first emplyee's country is: {0}", result.Country);
}
}
