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carColor = color; carMake = make; } } Now, within the Form s default constructor, populate a List<> member variable with a set of new Car objects: public partial class MainForm : System.Windows.Forms.Form { // Our list of Cars. private List<Car> arTheCars = new List<Car>(); public MainForm() { InitializeComponent(); CenterToScreen(); // Fill the list with some cars. arTheCars.Add(new Car("Chucky", "BMW", "Green")); arTheCars.Add(new Car("Tiny", "Yugo", "White")); arTheCars.Add(new Car("", "Jeep", "Tan")); arTheCars.Add(new Car("Pain Inducer", "Caravan", "Pink")); arTheCars.Add(new Car("Fred", "BMW", "Pea Soup Green")); arTheCars.Add(new Car("Buddha", "BMW", "Black")); arTheCars.Add(new Car("Mel", "Firebird", "Red")); arTheCars.Add(new Car("Sarah", "Colt", "Black")); } } Like the previous SimpleDataSet example, the CarDataTableViewer application will construct a DataTable that contains four DataColumns to represent the columns of the Inventory table within the Cars database. As well, this DataTable will contain a set of DataRows to represent a list of automobiles. This time, however, you will fill the rows using your generic List<> member variable. First, add a new member variable named inventoryTable of type DataTable to your Form. Next, add a new helper function to your Form class named CreateDataTable(), and call this method within the Form s default constructor. The code required to add the DataColumns to the DataTable object is identical to that in the previous example, so I ll omit it here (consult this book s code download for complete details). Do note, though, that you are iterating over each member of the List<> to build your row set: private void CreateDataTable() { // Create DataColumns and add to DataTable. ... // Iterate over the array list to make rows. foreach(Car c in arTheCars) { DataRow newRow = inventoryTable.NewRow(); newRow["Make"] = c.carMake; newRow["Color"] = c.carColor; newRow["PetName"] = c.carPetName; inventoryTable.Rows.Add(newRow); } // Bind the DataTable to the carInventoryGridView. carInventoryGridView.DataSource = inventoryTable; }

Public Property Get ID() As Long ID = m_lngID End Property Public Property Let ID(newID As Long) m_lngID = newID End Property Public Property Get PCType() As String PCType = m_sPCType End Property Public Property Let PCType(newPCType As String) m_sPCType = newPCType End Property Public Property Get PhoneType() As String PhoneType = m_sPhoneType End Property Public Property Let PhoneType(newPhoneType As String) m_sPhoneType = newPhoneType End Property Public Property Get Location() As String Location = m_sLocation End Property Public Property Let Location(newLocation As String) m_sLocation = newLocation End Property Public Property Get FaxYN() As String FaxYN = m_sFaxYN End Property Public Property Let FaxYN(newFaxYN As String) m_sFaxYN = newFaxYN End Property

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Notice that the final line of code within the CreateDataTable() method assigns the inventoryTable to the DataSource property. This single property is all you need to set to bind a DataTable to a DataGridView object. As you might guess, this GUI widget is reading the rows and column collections internally to establish the UI. At this point, you should be able to run your application and see the DataTable within the DataGridView control.

Now, what if you wish to remove a row from a DataTable One approach is to call the Delete() method of the DataRow object that represents the row to terminate. Simply specify the index (or DataRow object) representing the row to remove. Assume you update your GUI as shown in Figure 22-14.

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The following logic behind the new Button s Click event handler removes the specified row from your in-memory DataTable: // Remove this row from the DataRowCollection. private void btnRemoveRow_Click (object sender, EventArgs e) { try { inventoryTable.Rows[(int.Parse(txtRowToRemove.Text))].Delete(); inventoryTable.AcceptChanges(); } catch(Exception ex) { MessageBox.Show(ex.Message); } } The Delete() method might have been better named MarkedAsDeletable(), as the row is not literally removed until the DataTable.AcceptChanges() method is called. In effect, the Delete() method simply sets a flag that says, I am ready to die when my table tells me to. Also understand that if a row has been marked for deletion, a DataTable may reject the delete operation via RejectChanges(), as shown here: // Mark a row as deleted, but reject the changes. private void btnRemoveRow_Click (object sender, EventArgs e) {

inventoryTable.Rows[(int.Parse(txtRemove.Text))].Delete(); // Do more work ... inventoryTable.RejectChanges(); // Restore previous RowState value. }

Listing 4-3. The cAccess Class Private Private Private Private Private ' m_lngID As Long m_sBuilding As String m_iNetworkLevel As Integer m_sRemoteYN As String m_sParkingSpot As String

You may wish to see a small subset of a DataTable s data, as specified by some sort of filtering criteria. For example, what if you wish to see only a certain make of automobile from the in-memory Inventory table The Select() method of the DataTable class provides this very functionality. Update your GUI once again, this time allowing users to specify a string that represents the make of the automobile they are interested in viewing (see Figure 22-15). The result will be placed into a Windows Forms message box.

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