Database Search If No Result

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March 22nd, 2012, 03:16 PM

Kieranw7261

Registered User

Join Date: Dec 2008

Posts: 10

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Database Search If No Result

Hi there,

I am working on a project.
upon clicking a button the users data entry (order number) is used to search the database. I have the code to search the database below but I dont know what code to use to perform an error if the order number doesnt exist. Could anybody help. Im new to ASP and dont fully understand all the keywords available or the structures of if statements within it. Any help would be greatly appreciated.

Code:

Int64 ID = new Int64();
                ID = Convert.ToInt64(txtID.Text);

 
     using (cmpkwoodEntities context = new
      cmpkwoodEntities())
{

    Order order = new Order();

    order = context.Orders.SingleOrDefault(c => c.OrderID == ID);

        lblDate.Text = order.Date.ToShortDateString();
        lblCustomerForename.Text = order.Customer.Forename;
        lblCustomerSurname.Text = order.Customer.Surname;

        lblCity.Text = order.Customer.City;
        lblPostcode.Text = order.Customer.Postcode;

        OrderItem orderitem = new OrderItem();
        orderitem = context.OrderItems.SingleOrDefault(c => c.OrderID == ID);

        lblOrderID.Text = orderitem.OrderID.ToString();

        lblProductID.Text = orderitem.ProductID.ToString();

        Product product = new Product();
        product = context.Products.SingleOrDefault(c => c.ProductID == orderitem.ProductID);

        lblProductName.Text = product.Name.ToString();

March 22nd, 2012, 08:13 PM

Doug G

Grumpier Old Moderator

Dev Shed God 19th Plane (14000 - 14499 posts)

Join Date: Jun 2003

Posts: 14,235

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I don't see any reference to any database in the code you posted.

__________________
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Doug G
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It is a truism of American politics that no man who can win an election deserves to. --Trevanian, from the novel Shibumi

March 23rd, 2012, 03:58 PM