zxing qr code encoder example c# Changing Database Providers in C#.NET

Maker QR Code in C#.NET Changing Database Providers

Changing Database Providers
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The Provider_Change event in the DBInfo user form is fired any time the user selects a new database from the drop-down box or the ListIndex property changes. All this routine does is to select the appropriate page to display in the MultiPage control by setting its Value property like this:
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Private Sub Provider_Change DBProperties.Value = Provider.ListIndex End Sub
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Part 6: Excel and the Outside World: Collaborating Made Easy
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Microsoft Office Excel 2003 Programming Inside Out
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Selecting Windows Authentication
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A check box on the SQL Server page allows the user to select Windows authentication. When the Windows authentication information is used, there is no need to display the userid and passwords fields to the user. The following code handles the Click associated with the check box and hides the userid and password fields when the value of the control is True and displays them when the value is False.
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Private Sub DBWindowsAuth_Click() If DBWindowsAuth.Value Then DBUserId.Visible = False DBPassword.Visible = False DBUserIdLabel.Visible = False DBPasswordLabel.Visible = False Else DBUserId.Visible = True DBPassword.Visible = True DBUserIdLabel.Visible = True DBPasswordLabel.Visible = True End If End Sub
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Saving the Database Info
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When the user clicks the OK button, the code that follows is executed. The procedure calls the SaveSetting routine to save the values input by the user into the Windows registry.
Private Sub CommandButton1_Click()
SaveSetting "Excel2k3 VBA", SaveSetting "Excel2k3 VBA", SaveSetting "Excel2k3 VBA", SaveSetting "Excel2k3 VBA", SaveSetting "Excel2k3 VBA", SaveSetting "Excel2k3 VBA", SaveSetting "Excel2k3 VBA", ConnectionString.Text SaveSetting "Excel2k3 VBA", Unload Me End Sub "Query", "Query", "Query", "Query", "Query", "Query", "Query", "DBName", DBName.Text
"DBPassword", DBPassword.Text
"DBPath", DBPath.Text
"DBServer", DBServer.Text
"DBWindowsAuth", DBWindowsAuth.Value
"DBUserId", DBUserId.Text
"ConnectionString", _
"Query", "DBType", Provider.ListIndex
Part 6: Excel and the Outside World: Collaborating Made Easy
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Once the values have been saved to the Windows registry, the Unload routine is called to close the current form. Notice that the Cancel button s Click event merely calls the Unload routine to unload the form. Any changes made to the fields on the form are discarded. 504
Excel Query Program
I Am Me UserForm modules are like regular class modules, so you can refer to the current instance of the object by using the keyword Me. This can be extremely useful with some statements, such as the Unload statement, where you have to supply an object reference to the UserForm object you wish to unload.
When the user clicks the Cancel button, the CommandButton2 event is called. Because the user has chosen not to change the connection information stored in the registry, the only step necessary is to unload the current form.
Private Sub CommandButton2_Click() Unload Me End Sub
Editing a Query
The query values are stored in the ComboBox control on the Excel2k3 VBA Query command bar. Each query has its own entry, which can be selected by choosing the appropriate entry from the drop-down list. Pressing the Edit Query button on the command bar loads the DBQuery UserForm (shown in Figure 24-5) with the currently selected query from the ComboBox control on the command bar.
Figure 24-5. his query.
The DBQuery form is essentially a large textbox that allows the user to enter
Part 6: Excel and the Outside World: Collaborating Made Easy
24
Microsoft Office Excel 2003 Programming Inside Out The following code is executed when the UserForm is loaded. After locating the proper command bar, the FindControl method is used to get an object pointer to the Command barComboBox control by searching for the proper Tag property value. Then, assuming that the control exists, the Text property of the combo box control is copied to the large, multiline textbox control on the UserForm.
Private Sub UserForm_Initialize()
Dim c As CommandBar
Dim cc As CommandBarComboBox
On Error Resume Next
Set c = Application.CommandBars("Excel2k3 VBA Query")
Set cc = c.FindControl(, , "Excel2k3 VBA Query Statement")
If Not cc Is Nothing Then
Query.Text = cc.Text End If End Sub
Once the user has made the desired changes to the query, pressing the Close button closes the user form.
Private Sub CommandButton1_Click() Unload Me End Sub
When the user form is closed, the SaveData routine is called from the UserForm_Terminate event to insure that the query is always saved when the form is closed. By placing the call to SaveData here, the query is saved no matter how the form is closed.
Private Sub UserForm_Terminate() SaveData End Sub
The SaveData routine copies the query statement to the Text property of the CommandBarComboBox control using the same basic technique that was used to load the query.
Sub SaveData()
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