winforms data matrix

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Visual Web Developer makes it very easy to add new records to a data table. The only trick is to keep the generated CategoryID numbers in sequential order, as shown earlier in Figure 5-7. Otherwise, you won t be able to use the SQL scripts from the book s code archive to populate the tables that relate to Category. This can be tricky if you delete and add records in the table, because the auto-generated number keeps increasing, and you can t specify the ID manually. Erasing all the records of the table doesn t reset the auto-increment number. Instead, you need to truncate the table, or delete and re-create it. Another solution is to temporarily disable the (Is Identity) option, change the IDs manually, and then activate the option again. Finally, you can use the SET IDENTITY_INSERT command that we used in the SQL scripts in the code archive to populate the data table.

Now that you ve added categories and departments to the database, the next logical step is to add products This is different from what you did when adding categories, because between Product and Category, you must implement a Many-to-Many relationship Here you ll create the Product and ProductCategory tables The Product table contains a few more fields than the usual ProductID, Name, and Description Most of them are pretty selfexplanatory, but for completeness, let s look at each of them: ProductID uniquely identifies a product It s the primary key of the table Name stores the product s name Description stores the product s description Price stores the product s price Thumbnail stores the name of the product s thumbnail file name.

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The problem of the Canadian tax account is a common one that you will encounter in many situations. The essence of the problem is the need to assign state that is specific to an implementation without violating the intention of the general interface. To illustrate the problem, let s say that the method GetTaxRate() will include a reference to the province and year. The rewritten ITaxAccount interface would be as follows: public interface ITaxAccount { void AddDeduction(ITaxDeduction deduction); void AddIncome(ITaxIncome income); double GetTaxRate(double income, Province province, int year); ITaxDeduction[] Deductions { get; } ITaxIncome[] Income { get; } } The bolded code illustrates the added parameters that are used to calculate Canadian taxes. But is this a good solution No, it s a particularly bad solution. The parameters are specific to an implementation, and particularly to a Canadian implementation. The parameter year could be justified because most countries do have specific tax rates and implementations that are dependent on a year. Yet the parameter province has no justification. Imagine trying to implement a British tax system and needing to specify a province, when Britain does not collect income tax at a local level. A solution might be to redefine the interface as follows: public class Specifics { public Province CanadianProvince; public State AmericanState; } public interface ITaxAccount { void AddDeduction(ITaxDeduction deduction); void AddIncome(ITaxIncome income); double GetTaxRate(double income, int year, Specifics specifics);

Recall that to constrain a value to an integer, you just need to click Int in the operator list Click Bin in the operator list to set a binary constraint There Is Not Enough Memory Available to Solve the Problem: This message is displayed when Excel cannot allocate enough computer memory to Solver To address this message, close some files or programs, and then run Solver again Another Excel Instance Is Using SOLVERDLL: This message is displayed when more than one Excel instance is running, and one of those Excel instances is already using Solver Only one Excel instance can use Solver at a time To address this message, stop Solver if it is running in any open Excel instance, or close all Excel instances that you are not currently using, and run Solver again..

SQL Server can store binary data, including pictures, directly in the database, but we chose to store only the file names in the database and the actual picture files in the Windows file system This method also allows you to save the images in a separate physical location (for example, another hard disk), further improving performance for high-traffic web sites Image stores the name of the product s large picture file, which is displayed on the product details page PromoFront is a bit field (can be set to either 0 or 1) that specifies whether the product is featured on the front page of the web site The main page of the site will list the products that have this bit set to 1 This field doesn t accept NULLs and has a default value of 0.

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