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Conversion Tools Getting Started Investigating the Existing Solution Preparing to Convert the Application Investigating the Issues Converting the Application Conclusion Most Visual Basic 6 applications involve data in some way or another, and most Visual Basic 6 developers are comfortable working with ADO in order to solve their data-handling tasks.It's likely that if you're currently an expert Visual Basic 6 developer, you're interested in moving your skills to the world of .Ken Getz August 2005 Summary: Ken Getz shows you how to migrate your data-oriented application from Visual Basic 6.0 to Visual Basic 2005.(23 printed pages) Introduction Convert or Rewrite?You'll use this tool before upgrading the sample application.In addition, Visual Studio 2005 includes a wizard that attempts to convert existing Visual Basic 6 applications into Visual Basic 2005—you'll run this wizard as you load the project into Visual Studio 2005.The goal of these articles is for you to do the work yourself—that is, you'll start with the prepared Visual Basic 6 application, and you'll walk through the steps of performing the conversion, or creating the new application, yourself.

In the second article, you'll convert the application so that it uses ADO. If you follow through all three articles, you should be able to start converting your existing applications from Visual Basic 6 to Visual Basic 2005. NET, and you'll have interacted with the new data-binding scenarios supported in the latest version of Visual Studio.Private Enum Data State Loading = 0 Adding = 1 Editing = 2 No Rows = 3 Normal = 4 End Enum Private current Data State As Data State Private Sub Form_Load() Set customer = New Customer Handler ' Open the connection and the ' recordset, and then initialize ' the form. Get Customers If Not customer Recordset Is Nothing Then Call Init Form ' Display the form. The Handle Button State and Goto First Control procedures simply handle managing the user interface—you can investigate those directly in the source code: Private Sub Show Data() ' Set this flag so event procedures ' don't do anything during this ' process. Text = Null To Text(customer Recordset("Customer ID")) txt Data(1).Call Show Data Else Msg Box "Unable to load the requested data." Unload Me End If End Sub Private Sub Init Form() ' Put any code here that you want ' to run once for your form. Call Load States End Sub Private Sub Load States() ' Load cbo States from tbl States. Text = Null To Text(customer Recordset("First Name")) txt Data(2).The sample project includes the Data Layer class, which acts as a generic data tier—this class contains the code necessary to open connections and provide ADO Record Set instances. The module named bas Utility provides some simple utility procedures: Finally, the demonstration form, frm ADO, contains the code handling the user interface.The business layer within the application can call the Get Recordset method to retrieve an ADO Recordset object, and the Close Recordset method to release the Recordset and its connection. The form contains these declarations, including class-level variables to track the Customer Handler instance that manages the data, and another to refer to the Recordset containing the customer data: ' Keep track of the customer handler, and ' the customer recordset: Private customer As Customer Handler Private customer Recordset As ADODB. Move Next Loop End Sub The Show Data procedure moves data to the form from the underlying Recordset, keeping track of the current row.

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