Project 7: Northwind Traders Order Entry
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Northwind Order Entry
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Extend the Select Customer program from
Project 6 to permit the user to enter orders.
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Add orders to the database.
Print invoices.
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Refer the Concept Document for background material: http://www.cse.usf.edu/~turnerr/Software_Systems_Development/
Downloads/Northwind_Call_Center/
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Note: This project is just a start. It does not fully implement the system described in the Concept
Document.
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Database Tables

Use copies of the Northwind Traders
Database tables in your own database on scorpius.
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Do not use the real Northwind database, which is read only.
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You should have already added these tables to your scorpius database.
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Orders Table
For this project, use only OrderID, CustomerID, and OrderDate.
Note that OrderID is an Identity field.
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Order Details Table
For this project, set Discount to 0.00.
Other columns will have real values.
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Products Table
For this project, ignore SupplierID, QuantityPerUnit, UnitsInStock,
UnitsOnOrder, ReorderLevel, and Discontinued.
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Entity Classes

Define an Entity class corresponding to each database table used by the project.
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Customers
Order Details
Orders
Products
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Database Classes
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Objects of Entity classes encapsulate information corresponding to one row of a database table.
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The Entity classes encapsulate knowledge of how to access the database as well as information from the database.
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Home Form

Add a button to the Home Form labeled
Enter Order.
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Enabled only when a customer is selected.
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This button brings up a new form that permits the user to enter an order for the selected customer.
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Home Form
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Order Entry Form
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Order Entry Form
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The Category dropdown list is bound to the Categories table.

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Display Member: Category Name
Value Member: CategoryID
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List never changes.
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When a category is selected, the Product list is set up with products having the selected category.
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Order Entry Form

The Product dropdown list is bound to the
Products table, but only lists products in the selected category.
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When a product is selected, its Unit Cost should appear in the Unit Cost textbox, a default value of 1 should appear in the Quantity textbox, and the Add to Order button should be enabled.
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Adding an Item to the Order
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After selecting a product, the user can enter a different value into the Quantity textbox if desired.
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Must be a positive integer.
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Less than 1000.
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Order Item Information Set Up
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Adding an Item to the Order
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When the user clicks Add to Order, a line item is added to the order as shown in the
DataGridView below the dropdown lists.
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At this time the Submit Order button should be enabled.
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It should be disabled until the first line item is added to the order.
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In this project, we will not implement reservations for products in pending orders as described in the concept document.
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Order with One Line Item
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Entering an Order
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The user can continue adding line items up to a maximum of 10.
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The user can click Cancel to delete the current order and return to the Home form.
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When all items have been entered, the user clicks Submit Order to add this order to the database.
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One row is added to the Orders table.
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One row is added to the Order Details table for each line item of the order.
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Entering an Order
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When the user clicks Submit Order the Print
Invoice button is enabled.
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The Submit Order button is now disabled.
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The text on the Cancel button becomes Return.
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User can no longer cancel the order.
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Ready to Submit Order
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After Order Entered
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Print Invoice
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The Print Invoice button outputs order information to a printer.
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Use a Print Dialog to let the user select a printer.
Always print “all” pages.
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There will only be one page
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Use a fixed width font for line items so that columns of numbers can be aligned.
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Invoice
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Implementation Specifications
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Use a DataGridView to show the line items of the order on the Order Entry form.
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Use a DataTable to hold the order information as the order is being entered.
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Do not put anything into the database until the user clicks Submit Order.
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Implementation Specifications
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Declare the DataTable as a member of the Order Entry Form class.
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Add columns programatically in the form class constructor.
Add rows to the DataTable as line items are added to the order.
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Implementation Specifications
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Bind the DataGridView to the DataTable in the form class constructor.
Set DataGridView column widths and style programatically.
http://www.cse.usf.edu/~turnerr/Software_Systems_Development/
044_DataGridView.pdf
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Printing Tip
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Numerical quantities should be right aligned in their boxes.
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DrawString specifies position of left edge.
Where to you put the left edge of the string so that the right edge comes out at the right edge of the box?
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We need to know how long the printed string will be.
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Printing Tip
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In Visual Studio Help
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Search for MeasureText http://msdn.microsoft.com/en-us/library/system.windows.forms.textrenderer.measuretext(VS.80).aspx
http://msdn.microsoft.com/en-us/library/y4xdbe66(VS.80).aspx
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TextRendered.MeasureText Method

TextRendered.MeasureText Method

MeasureText Example private void print_line_item(Graphics g, Order_Detail od, ref int y_pos)
{
Font f = new Font("Courier New", 10); int h = invoice_font.Height;
Brush b = invoice_brush;
Rectangle r;
Pen p = SystemPens.WindowText;
Size size;
String str = " "; int space; r = new Rectangle(50, y_pos, dataGridView1.Columns[0].Width, h); g.DrawString(od.Product.ProductName, f, b, r.X + 5, y_pos); g.DrawRectangle(p, r); r.X += dataGridView1.Columns[0].Width; r.Width = dataGridView1.Columns[1].Width; str = od.Product.UnitPrice.ToString("C"); size = TextRenderer.MeasureText(str, f); space = r.Width - size.Width - 10; g.DrawString(str, f, b, r.X + space, y_pos); g.DrawRectangle(p, r);
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Ground Rules
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You may work with one other person.
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OK to work alone if you prefer.
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If you do work as a pair
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Both members are expected to contribute.
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Submit a single program.
Both members should understand the program in detail.
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It is OK to discuss the project, but ...
Do not share your work with other students.
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Before or after submitting the project.
Do not copy any other student’s work.
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Don’t look at anyone else’s program.
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Ground Rules
Except for code currently posted on the class web site
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Do not copy code from the Internet
 or any other source.
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Write your own code.
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Submission
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Project is due before 11:59 PM, Monday night, April 25.
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Deliverables:
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Entire project folder, zipped
Please use Windows “Send to” command to zip the folder.
Submit your project using the Blackboard Assignment for this class.
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If done as a pair, only one member should submit the project.
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Include both names in the assignment comments and in source file comments.
Other student submit just a comment with both names.
End of Presentation
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