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Every DataTable object has an associated DataView object that can be
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used for data binding Additional views can be created for each table, but one view is always present once the table has been created DataTable objects do not really have a current row Instead, the DataTable s CurrencyManager object, located within the form s BindingContext property, must be used to position the DataTable to a row One side note before we begin writing our data binding code: In 7, we cover the subject of LINQ Although not directly connected to the subject of data binding, LINQ does provide you with additional options for gathering, creating, filtering, and sorting the data you wish to display For this reason, there will considerable data-binding code in 7, and your ability to present data to the user will be extended beyond what is covered in this chapter by the information presented in the next chapter We begin by writing a very simple application to illustrate the benefits and issues of data binding We use a very simple SQL Server CE database to populate the data set The tables in the data set are the Categories and Products tables; the relationship between them has been defined within the data set by adding a DataRelation object named FKProdCat to the data
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62 Working with Data Sets
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set Once the data set has been populated, we use data binding to display the information in the tables to the user The focus here is on the binding of data between the data set and the controls, not on the movement of data between the data set and the database We cover the latter in detail later in this chapter when we discuss accessing SQL Server CE and SQL Server databases The application, located in the DataBinding project on the book s Web site,1 consists of two forms The first form, shown in Figure 63, consists of two DataGrid controls, one for displaying the Categories rows and one for displaying the Products rows of whichever Category the user selects In other words, we want to reflect the parent/child relationship between categories and products on the form The second form, shown in Figure 64, displays one product at a time in TextBox controls and provides the user with a variety of ways to specify the desired product It also allows the user to update the product information The two forms are not related in a business sense; we are simply using one to illustrate multi-item data binding and the other to illustrate singleitem data binding The first form is the simpler to program, as we shall see, for it binds data tables to multi-item controls
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Figure 63: The Parent/Child Form
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1 You can download the projects mentioned in this chapter from wwwpaulyaocom/ cfbook/code Follow the instructions listed on the Web site
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Figure 64: The Single-Item Form
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6221 Binding to Multi-Item Controls
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The form shown in Figure 63 declares a private variable to hold the data set named dsetDB; creates a new data set, storing the reference in dsetDB; and loads dsetDB with data from the SQL Server CE database At this point, we have a data set that contains two data tables and the relationship between them To reflect that relationship on the form, we bind the upper DataGrid control to the Categories data table so that the entire table is displayed within the DataGrid control We bind the lower DataGrid control to the default view of the Products table because we can easily update the view whenever the user selects a new category Here is the data-binding code:
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private void mitemDisplayDS_Click(object sender, EventArgs e) { // Display the Categories and Products tables // in the parent and child DataGrids dgridParentDataSource = dsetDBTables["Categories"]; dgridChildDataSource = dsetDBTables["Products"]DefaultView; }
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Whenever the user selects a new category, the application reacts to the CurrentCellChanged event by setting the row filter for the Products view to select only products of that category, as shown in this code:
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