barcode generator in c# windows application free Private Sub ShowDatabaseInfo() DBInfo.Show vbModal End Sub in Visual C#.NET

Make Denso QR Bar Code in Visual C#.NET Private Sub ShowDatabaseInfo() DBInfo.Show vbModal End Sub

Private Sub ShowDatabaseInfo() DBInfo.Show vbModal End Sub
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The EditDatabaseQuery routine does the same thing with the DBQuery form.
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Private Sub EditDatabaseQuery() DBQuery.Show vbModal End Sub
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Ending the Program
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The Workbook_BeforeClose event calls the DeleteCommandBar routine to ensure that all the changes it made to Excel s menus are removed prior to Excel shutting down.
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Private Sub Workbook_BeforeClose(Cancel As Boolean) DeleteCommandBar End Sub
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Part 6: Excel and the Outside World: Collaborating Made Easy
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Excel Query Program The logic in the DeleteCommandBar routine is similar to the logic in the AddCommandBar routine that ensures that the command bar doesn t exist before creating a new one. Error checking is disabled, and a temporary object reference to the CommandBar object is created from the CommandBars collection. If the temporary object reference is valid, the Delete method is used to remove the entire command bar with all its command bar controls from Excel.
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Sub DeleteCommandBar() Dim c As CommandBar On Error Resume Next
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Set c = Application.CommandBars("Excel2k3 VBA Query")
If Not c Is Nothing Then
Application.CommandBars("Excel2k3 VBA Query").Delete End If End Sub
Connecting to a Database
To execute a database query, you need to create a connection to the database. However, because you need different connection information for each database, it makes sense to use a user form to collect this information. (See Figure 24-3.)
Figure 24-3. The user supplies the database connection information through the Database Properties dialog box.
Part 6: Excel and the Outside World: Collaborating Made Easy
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The program stores the connection information in the Microsoft Windows registry so the program will remember the last value that the user selected.
Microsoft Office Excel 2003 Programming Inside Out Because each database system needs different connection information, a hidden MultiPage control contains a unique Page object for each supported database. A ComboBox control at the top of the user form selects which page is visible. This arrangement is more clearly illus trated in the Visual Basic Editor, as shown in Figure 24-4.
Figure 24-4. Each page in the MultiPage control contains connection information unique to each particular database.
Keep an Eye on Your Tabs When you are developing applications with the MultiPage control, you might want to leave the tabs visible in design mode even though you want to hide them from the user. Doing so lets you quickly switch to the tab you want to modify while in development mode. Then, when you load the form, just set the Style property to: MultiPage1.Style = fmTabStyleNone.
Initializing the DBInfo UserForm
When the DBInfo form, which generates the Database Properties dialog box, is loaded, the UserForm_Initialize event shown in the following code is fired. The first step is to populate the Provider ComboBox control with the list of supported databases. For this example, only the Microsoft Access and SQL Server databases have their own pages; however, an Advanced page was added that allows the user to input any connection string value.
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Part 6: Excel and the Outside World: Collaborating Made Easy
Excel Query Program
Private Sub UserForm_Initialize() Provider.AddItem "Access (Jet)" Provider.AddItem "SQL Server" Provider.AddItem "Advanced" DBProperties.Style = fmTabStyleNone DBName.Text = GetSetting("Excel2k3 VBA", "Query", "DBName", _ "<enter database name>") DBPassword.Text = GetSetting("Excel2k3 VBA", "Query", "DBPassword", _ "<enter password>") DBPath.Text = GetSetting("Excel2k3 VBA", "Query", "DBPath", _ "<enter path to database file>") DBServer.Text = GetSetting("Excel2k3 VBA", "Query", "DBServer", _ "<enter database server>") DBWindowsAuth.Value = GetSetting("Excel2k3 VBA", "Query", _ "DBWindowsAuth", True) DBUserId.Text = GetSetting("Excel2k3 VBA", "Query", "DBUserId", _ "<enter userid>") ConnectionString.Text = GetSetting("Excel2k3 VBA", "Query", _ "ConnectionString", "<enter connection string>") Provider.ListIndex = GetSetting("Excel2k3 VBA", "Query", "DBType", 0) End Sub
The tabs on the MultiPage control are hidden by setting the Style property to fmTabStyleNone. The GetSetting function is used to extract the values for each field on the form from the reg istry. The GetSetting function takes four parameters. The first three parameters represent a key that is used to identify the value, while the fourth parameter provides a default value in case the value isn t currently stored in the registry. At the bottom of the listing, the last GetSetting function is used to choose the selected database and set the ComboBox control accordingly. Note that setting the ListIndex property will also fire the Change event associated with the control.
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