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Next, define a member variable named coltsOnlyView of type DataView: public partial class MainForm : Form { // View of the DataTable DataView coltsOnlyView; // I only show red colts .. } Now, create a new helper function named CreateDataView(), and call this method within the Form s default constructor directly after the DataTable has been fully constructed, as shown here: public MainForm() { .. // Make a data table CreateDataTable(); // Make Views CreateDataView(); } Here is the implementation of this new helper function Notice that the constructor of each DataView has been passed the DataTable that will be used to build the custom set of data rows private void CreateDataView() { // Set the table that is used to construct this view coltsOnlyView = new DataView(inventoryTable); // Now configure the views using a filter coltsOnlyViewRowFilter = "Make = 'Colt'"; // Bind to grid dataGridColtsView.

DataSource = coltsOnlyView; } As you can see, the DataView class supports a property named RowFilter, which contains the string representing the filtering criteria used to extract matching rows Once you have your view established, set the grid s DataSource property accordingly Figure 22-17 shows the completed application in action..

Now that you understand the ins and outs of manipulating ADO.NET DataSets, let s turn our attention to the topic of data adapters. Recall that data adapter objects are used to fill a DataSet with DataTable objects and send modified DataTables back to the database for processing. Table 22-15 documents the core members of the DbDataAdapter base class. Table 22-15. Core Members of the DbDataAdapter Class

1, 0,

SelectCommand InsertCommand UpdateCommand DeleteCommand Fill() Update()

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Our data class is named cHRData. This class is being designed specifically for our HRWizard application, and will be closely coupled with our cPerson object and our EmpData worksheet. Insert a new class module and name it cHRData. Add the following module-level variables, one property, and one method: Private Private Private Private ' m_oWorksheet As Worksheet m_lngNewRowNum As Long m_oEmployee As cPerson m_oXL As cExcelUtils

Establish SQL commands that will be issued to the data store when the Fill() and Update() methods are called.

Fills a given table in the DataSet with some number of records based on the command object specified SelectCommand. Updates a DataTable using command objects within the InsertCommand, UpdateCommand, or DeleteCommand property. The exact command that is executed is based on the RowState value for a given DataRow in a given DataTable (of a given DataSet).

The first line of any dd contained within a dl with a class of wines The first letter of any p contained within an li with the ID of description, contained within a ul Inserts content before any li contained within an ol with the ID of priority Inserts content after any p with a class of item-footer contained within a div with the ID of main

In the examples that follow, remember that data adapter objects manage the underlying connection to the database on your behalf; therefore, you will not need to explicitly open or close your session with the DBMS. However, you will still need to supply the data adapter with a valid connection object or a connection string (which will be used to build a connection object internally) as a constructor argument.

Create a new console application named FillDataSetWithSqlDataAdapter and make use of the System.Data and System.Data.SqlClient namespaces. Update your Main() method as so (try/catch logic has been omitted here for simplicity): static void Main(string[] args) { Console.WriteLine("***** Fun with Data Adapters *****\n"); string cnStr = "uid=sa;pwd=;Initial Catalog=Cars;Data Source=(local)"; // Fill the DataSet with a new DataTable. DataSet myDS = new DataSet("Cars"); SqlDataAdapter dAdapt = new SqlDataAdapter("Select * From Inventory", cnStr); dAdapt.Fill(myDS, "Inventory"); // Display contents. PrintDataSet(myDS); } Notice that the data adapter has been constructed by specifying a SQL Select statement. This value will be used to build a command object internally, which can be later obtained via the SelectCommand property. Next, notice that the Fill() method takes an instance of the DataSet type and optionally a string name that will be used to set the TableName property of the new DataTable (if you do not specify a table name, the data adapter will simply name the table Table ).

As you would expect, when you pass the DataSet to the PrintDataSet() method (implemented earlier in this chapter), you are presented with a list of all rows in the Inventory table of the Cars database (see Figure 22-18).

Public Property Get Worksheet() As Worksheet Set Worksheet = m_oWorksheet End Property Public Property Set Worksheet(newWorksheet As Worksheet) Set m_oWorksheet = newWorksheet End Property

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