public void ChangePrice(string productNumber, decimal price)
{
// Modify the price of the selected product
// If the update is successful then return true, otherwise return false.
Product product = null;
try
{
// Connect to the AdventureWorks database by using the Entity Framework
using (AdventureWorksEntities database = new AdventureWorksEntities())
{
if (!ProductExists(productNumber, database))
return;
else
{
// Find the specified product
product = (from p in database.Products
where String.Compare(p.ProductNumber, productNumber) == 0
select p).First();
// Change the price for the product
product.ListPrice = price;
// Save the change back to the database
database.SaveChanges();
}
}
}
catch
{
// If an exception occurs, return false to indicate failure
return;
}
// Notify the client that the price has been changed successfully
ProductData productData = new ProductData()
{
ProductNumber = product.ProductNumber,
Name = product.Name,
ListPrice = product.ListPrice,
Color = product.Color
};
raisePriceChangedEvent(productData);
}
public bool ChangeStockLevel(string productNumber, short newStockLevel,
string shelf, int bin)
{
// Modify the current stock level of the selected product
// in the ProductInventory table.
// If the update is successful then return true, otherwise return false.
// The Product and ProductInventory tables are joined over the
// ProductID column.
try
{
// Connect to the AdventureWorks database by using the Entity Framework
using (AdventureWorksEntities database = new AdventureWorksEntities())
{
// Find the ProductID for the specified product
int productID =
(from p in database.Products
where String.Compare(p.ProductNumber, productNumber) == 0
select p.ProductID).First();
// Find the ProductInventory object that matches the parameters passed
// in to the operation
ProductInventory productInventory = database.ProductInventories.First(
pi => String.Compare(pi.Shelf, shelf) == 0 &&
pi.Bin == bin &&
pi.ProductID == productID);
// Update the stock level for the ProductInventory object
productInventory.Quantity += newStockLevel;
// Save the change back to the database
database.SaveChanges();
}
}
catch
{
// If an exception occurs, return false to indicate failure
return false;
}
// Return true to indicate success
return true;
}