static void TestVersionControl()
{
using (NorthwindEntities NWEntities = new NorthwindEntities())
{
// first user
Console.WriteLine("First User ...");
Product product = (from p in NWEntities.Products
where p.ProductID == 3
select p).First();
Console.WriteLine("Original unit in stock: {0}",
product.UnitsInStock);
product.UnitsInStock += 1;
Console.WriteLine("Current unit in stock to update: {0}",
product.UnitsInStock);
// process more products
// second user
Console.WriteLine("\nSecond User ...");
using (NorthwindEntities1 NWEntities1 = new NorthwindEntities1())
{
Product1 product1 = (from p in NWEntities1.Product1s
where p.ProductID == 3
select p).First();
Console.WriteLine("Original unit in stock: {0}",
product1.UnitsInStock);
product1.UnitsInStock += 2;
Console.WriteLine("Current unit in stock to update: {0}",
product1.UnitsInStock);
NWEntities1.SaveChanges();
Console.WriteLine("update submitted to database");
}
// first user is ready to submit changes
Console.WriteLine("\nFirst User ...");
try
{
NWEntities.SaveChanges();
}
catch (DbUpdateConcurrencyException e)
{
Console.WriteLine("Conflicts detected. Refreshing ...");
var entry = e.Entries.Single();
entry.OriginalValues.SetValues(entry.GetDatabaseValues());
NWEntities.SaveChanges();
Console.WriteLine("update submitted to database after refresh");
}
}
}
static void TestVersionControl()
{
using (NorthwindEntities NWEntities = new NorthwindEntities())
{
// first user
Console.WriteLine("First User ...");
Product product = (from p in NWEntities.Products
where p.ProductID == 3
select p).First();
Console.WriteLine("Original unit in stock: {0}",
product.UnitsInStock);
product.UnitsInStock += 1;
Console.WriteLine("Current unit in stock to update: {0}",
product.UnitsInStock);
// process more products
// second user
Console.WriteLine("\nSecond User ...");
using (NorthwindEntities1 NWEntities1 = new NorthwindEntities1())
{
Product1 product1 = (from p in NWEntities1.Product1s
where p.ProductID == 3
select p).First();
Console.WriteLine("Original unit in stock: {0}",
product1.UnitsInStock);
product1.UnitsInStock += 2;
Console.WriteLine("Current unit in stock to update: {0}",
product1.UnitsInStock);
NWEntities1.SaveChanges();
Console.WriteLine("update submitted to database");
}
// first user is ready to submit changes
Console.WriteLine("\nFirst User ...");
try
{
NWEntities.SaveChanges();
}
catch (DbUpdateConcurrencyException e)
{
Console.WriteLine("Conflicts detected. Refreshing ...");
var entry = e.Entries.Single();
entry.OriginalValues.SetValues(entry.GetDatabaseValues());
NWEntities.SaveChanges();
Console.WriteLine("update submitted to database after refresh");
}
}
}
