winforms data matrix

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3. Select both the CartID and ProductID fields and click the golden key symbol (or right-click and select Set Primary Key) to create a composite primary key formed of these two fields. 4. Press Ctrl+S to save the table. Choose ShoppingCart for the name and click OK. 5. Add a foreign key by right-clicking the table and selecting Relationships, or by going to Table Designer Relationships. 6. Click Add to create a new relationship entry.

Note There are multiple constructors for ConfigurationProperty. For more information, check out the

If you need to find text values that share some type of common characters, you can use wildcard Tip

Figure 13-5. Adding a new relationship 8. Complete the form that appears, as shown in Figure 13-6.

MSDN documentation (http://msdn2.microsoft.com/en-us/library/system.configuration. configurationproperty.configurationproperty.aspx).

Figure 13-6. Setting foreign key properties 9. Click OK and then Close. 10. Save your table. Confirm the action when asked about applying changes to the Product and ShoppingCart tables.

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Once you have defined a property, you need to cross-reference it with a property and the base class ConfigurationSection: [ConfigurationProperty("easyname", IsRequired = true)] public string EasyName { get { return (string)base[_propEasyName]; } } Whenever you reference the property EasyName, the attributes associated with the property provide a cross-reference with the configuration file. Whenever the property is called, the base indexer with data member that references ConfigurationProperty is called and marshals the data from the configuration file to the .NET type. The complete implementation used to process the XML node <loader> is as follows (added to the Definitions assembly): ... using System.Configuration; namespace Definitions { public class LoaderSection : ConfigurationSection { static ConfigurationProperty _propEasyName; static ConfigurationProperty _propTypeName; static ConfigurationProperty _propAssemblyName; static ConfigurationPropertyCollection _properties; static LoaderSection() { _propEasyName = new ConfigurationProperty(

CartID is the unique ID you ll generate for each shopping cart. Unlike the other unique identifiers you ve seen so far, this is not an integer field; instead, it s a Char(36) field, which will be filled with a GUID string. A GUID (Globally Unique Identifier) is a value guaranteed to be unique across time and space. Two generated GUIDs will never be the same. The string representation of a GUID has 36 characters: The GUID itself is 32 bytes long, and its string representation also contains 4 separating dashes. An example of a GUID is ff8029a7-91e2-4ca2-b4e7-99a7588be751.

"easyname", typeof(string), null, ConfigurationPropertyOptions.IsRequired); _propTypeName = new ConfigurationProperty( "typename", typeof(string), null, ConfigurationPropertyOptions.IsRequired); _propAssemblyName = new ConfigurationProperty( "assemblyname", typeof(string), null, ConfigurationPropertyOptions.IsRequired); _properties = new ConfigurationPropertyCollection(); _properties.Add(_propEasyName); _properties.Add(_propTypeName); _properties.Add(_propAssemblyName); } [ConfigurationProperty("easyname", IsRequired = true)] public string EasyName { get { return (string)base[_propEasyName]; } } [ConfigurationProperty("typename", IsRequired = true)] public string TypeName { get { return (string)base[_propTypeName]; } } [ConfigurationProperty("assemblyname", IsRequired = true)] public string AssemblyName { get { return (string)base[_propAssemblyName]; } } } } The LoaderSection class does two jobs: it tells the underlying configuration infrastructure what LoaderSection is interested in, and it provides an easy-to-use API to the configuration data. The first job is nice to have done, but the second is absolutely essential. Many parts of the data structure are declared as static because we are using those data members as reference data members to make it easier when retrieving values for data members. To understand what happens, let s see an example of retrieving the values from a configuration file.

Tip When you know the exact length of the strings you re storing in a table field, it s better to use the Char

characters. A question mark ( ) represents any single character; for example, jo es finds jones and jokes. An asterisk (*) represents any number of characters; for example, *west finds Northwest and Southwest. A tilde (~) followed by , *, or ~ represents a literal question mark, asterisk, or tilde; for example, Yes~ finds Yes .

As you ve seen, the <configSections> element declares a custom XML node that, when encountered, instantiates a specific type LoaderSection is instantiated in this example. The values are retrieved from the custom configuration as follows:

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