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An exception will be thrown when the schemas in the source and target DataSets do not match. All schema inconsistencies between the source and target DataSets are ignored.
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In the following code example, the contents of the OldSalesDataSet are merged into the contents of the SalesHistoryDataSet. The PreserveChanges parameter is set to True and any schema differences will be ignored.
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' VB SalesHistoryDataSet.Merge(OldSalesDataSet, True, MissingSchemaAction.Ignore) // C# SalesHistoryDataSet.Merge(OldSalesDataSet, true, MissingSchemaAction.Ignore);
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In some situations you may need to create a copy of the data in a DataSet. For exam ple, you might need to manipulate a copy of the data and perform some processing, but you might not want to modify the original data. To create a copy of a DataSet, you simply create a new DataSet object and assign it the return value of the DataSet. Copy method. The following code example demonstrates this:
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' VB Dim CopyOfDataSet As New DataSet
CopyOfDataSet = OriginalDataSet.Copy
// C# DataSet CopyOfDataSet = new DataSet();
CopyOfDataSet = OriginalDataSet.Copy();
Lab: Creating DataSet Objects
In this lab you will create typed and untyped DataSet objects.
Exercise 1: Creating a DataSet with the DataSet Designer
The DataSet Designer is a design-time tool that assists in the creation of typed DataSet objects by allowing you to drag and drop database tables from Server Explorer onto the design surface. As you drop tables on the surface, they are added to the DataSet as typed objects that make programming as simple as writing the table and column names you want to access. 1. Create a Windows application and name it DataSetDesignerExample. 2. From the Project menu, select Add New Item. 3. Select the DataSet template and name it NorthwindDataSet.xsd. 4. Navigate to the Customers table in Server Explorer and drag it onto the design surface. 5. Navigate to the Orders table in Server Explorer and drag it onto the design sur face.
Lesson 1: Creating DataSet Objects
After dropping the Customers and Orders tables onto the DataSet Designer, the design surface should look similar to Figure 7-1.
Figure 7-1 Customers and Orders DataTable objects and TableAdapter objects as seen in the DataSet Designer
6. Build the project before moving on to the next step. 7. Drag a ListBox onto Form1 and name it CustomersListBox. 8. Drag a button onto Form1 and set the following properties:
Name = GetCustomersButton Text = Get Customers
9. Double-click the Get Customers button and add the following code to the GetCustomersButton_Click event handler:
' VB ' Instantiate a Northwind typed dataset.
Dim NorthwindDataSet1 As New NorthwindDataSet
' Instantiate a CustomersTableAdapter.
Dim CustomersTableAdapter1 As New NorthwindDataSetTableAdapters.CustomersTableAdapter
' Call the default Fill method to load all customers into the Customers DataTable.
CustomersTableAdapter1.Fill(NorthwindDataSet1.Customers)
' Loop through the rows in the Customers table and add the value from the CompanyName
column
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' to the ListBox. For Each NWCustomer As NorthwindDataSet.CustomersRow In NorthwindDataSet1.Customers.Rows CustomersListBox.Items.Add(NWCustomer.CompanyName) Next // C# // Instantiate a Northwind typed dataset.
NorthwindDataSet NorthwindDataSet1 = new NorthwindDataSet ();
// Instantiate a CustomersTableAdapter. NorthwindDataSetTableAdapters.CustomersTableAdapter CustomersTableAdapter1 = new NorthwindDataSetTableAdapters.CustomersTableAdapter(); // Call the default Fill method to load all customers into the Customers DataTable. CustomersTableAdapter1.Fill(NorthwindDataSet1.Customers); // Loop through the rows in the Customers table and add the value from the CompanyName column // to the ListBox. foreach (NorthwindDataSet.CustomersRow NWCustomer in NorthwindDataSet1.Customers.Rows) { CustomersListBox.Items.Add(NWCustomer.CompanyName);
10. Run the application and click the Get Customers button. Verify that the CompanyName from each customer is displayed in the CustomersListBox similar to Figure 7-2.
Figure 7-2 The CompanyName from all customers appearing in the CustomersListBox after clicking the Get Customers button
Exercise 2: Creating a Typed DataSet with the Data Source Configuration Wizard
This exercise provides instructions for creating a strongly typed DataSet using the Data Source Configuration Wizard. 1. Create a Windows application and name it DataSourceWizardExample. 2. Start the Data Source Configuration Wizard by selecting Add New Data Source from the Data menu.
Lesson 1: Creating DataSet Objects
NOTE
Data menu
If the Data menu is not available, open the form in Design view.
3. Leave the default selection of Database on the Choose A Data Source Type page, as shown in Figure 7-3. Then, click Next.
Figure 7-3
The Choose a Data Source Type page of the Data Source Configuration Wizard
4. The list box displays the available data connections from Server Explorer. Select a connection to the Northwind sample database or create a new data connection on the Choose Your Data Connection page, as shown in Figure 7-4. Then, click Next. If prompted, click Yes to add the database to your project.
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