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One of the most popular reasons for downloading data from a database server is to display it in a control on a form. This section describes two approaches to populating a ListBox control on a Windows Form. The first is how to assign a column of values from a DataTable to display in a ListBox. One especially nice feature of this approach is that you do not have to iterate through the rows in the DataTable. The second is demonstrated by a sample that conditionally populates a second ListBox control based on the currently selected item in the first ListBox control. The contents of the second ListBox control are updated whenever a user picks a new item from the first ListBox control.

Figure 12-2 shows the two ListBox controls in operation. Clicking the Button control (Button3) above the first ListBox on the left (ListBox1) populates ListBox1 with the Name column values from the ProductCategories DataTable. Initially, ListBox1 opens with the Accessories item selected. This item is from the first row in the ProductCategories DataTable. After populating ListBox1, the second ListBox control (ListBox2) shows the Name column values for matching items by ProductCategoryID from the ProductSubcategories DataTable. When a user selects another ListBox1 item, such as Bikes, the items showing in ListBox2 update to show Name column values for the most recently selected item from the ProductSubcategories DataTable.

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ADO.NET also works in both connected and disconnected environments. You can connect to a database, remain connected while simply reading data, and then close your connection, which is a process similar to ADO. Where ADO.NET really begins to shine is in the disconnected world. If you need to edit database data, maintaining a continuous connection would be costly on the server. ADO.NET gets around this by providing a sophisticated disconnected model. Data is sent from the server and cached locally on the client. When you re ready to update the database, you can send the changed data back to the server, where updates and conflicts are managed for you. In ADO.NET, when you retrieve data, you use an object known as a data reader. When you work with disconnected data, the data is cached locally in a relational data structure, either a data table or a dataset.

BEGIN <statements> RETURN <value> END DROP FUNCTION <scalar function name> Listing 8-10 demonstrates how to create and use user-defined functions. Type in and execute the code to learn more. Listing 8-10. Creating and Using User-Defined Scalar Functions USE AdventureWorks2008; GO --1 IF OBJECT_ID('dbo.udf_Product') IS NOT NULL BEGIN DROP FUNCTION dbo.udf_Product; END; IF OBJECT_ID('dbo.udf_Delim') IS NOT NULL BEGIN DROP FUNCTION dbo.udf_Delim; END; GO --2 CREATE FUNCTION dbo.udf_Product(@num1 INT, @num2 INT) RETURNS INT AS BEGIN DECLARE @Product INT; SET @Product = ISNULL(@num1,0) * ISNULL(@num2,0); RETURN @Product; END; GO --3 CREATE FUNCTION dbo.udf_Delim(@String VARCHAR(100),@Delimiter CHAR(1)) RETURNS VARCHAR(200) AS BEGIN DECLARE @NewString VARCHAR(200) = ''; DECLARE @Count INT = 1;

Figure 12-2. You can conditionally populate a second ListBox control based on a selection from an initial ListBox control. The code to achieve the functionality depicted in Figure 12-2 is remarkably easy. The code in the Button3_Click procedure, which is shown next, initially populates ListBox1. This procedure has two parts. The procedure begins by populating the ProductCategories and ProductSubcategories DataTable objects. The code does this by calling the TwoDTsInADS procedure after specifying two String variables with SQL statements. The last two statements in the Button3_Click procedure assign the Name column values from the ProductCategories DataTable to ListBox1. No iterating is required with this approach. The ProductCategories DataTable is the first DataTable in the das1 DataSet, so it has a table index value of 0. The following code uses the das1.Tables(0) expression to assign the whole DataTable to the DataSource property of ListBox1. To show a particular column, you must specify the column name as the DisplayMember property for ListBox1. Dim strQuery1 As String = _ "SELECT ProductCategoryID, Name " & _ "FROM Production.ProductCategory" Dim strQuery2 As String = _ "SELECT ProductCategoryID, " & _ "ProductSubcategoryID, Name " & _ "FROM Production.ProductSubcategory" das1 = TwoDTsInADS(strQuery1, strQuery2) Me.ListBox1.DataSource = das1.Tables(0) Me.ListBox1.DisplayMember = "Name"

A dataset (a DataSet object) can hold large amounts of data in the form of tables (DataTable objects), their relationships (DataRelation objects), and constraints (Constraint objects) in an in-memory cache, which can then be exported to an external file or to another dataset. Since XML support is integrated into ADO.NET, you can produce XML schemas and transmit and share data using XML documents (much more on this in 14). Table 4-1 describes the namespaces in which ADO.NET components are grouped.

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