- Visual basic application wizard update#
- Visual basic application wizard code#
- Visual basic application wizard windows#
The wizard suggests a name for the form file, such as DataForm1.vb, which you can override. You invoke the Data Form Wizard by choosing Project, Add New Item, and selecting Data Form Wizard from the Templates. (For example, you could make the form created by the wizard the project s startup object.) If you do not use a switchboard menu in your project, you need another mechanism for transferring control to the form created by the Data Form Wizard. It has a Form1, formatted to look like Figure 6-11, and four data forms that were created with the Data Form Wizard. This sample is located in the DataFormWizSamples project. Successive forms created with the Data Form Wizard have the default names DataForm1, DataForm2, and so on.
Visual basic application wizard windows#
Starting the Data Form Wizard from a Windows application project creates a Windows form. One of these types is the Windows application project that we have repeatedly explored in this chapter and earlier ones. To invoke the Data Form Wizard, you will need to start from a type of project that supports the wizard. However, for the purpose of this sample (and this chapter), let s see how simple the Data Form Wizard can make this task. Chapters 7 through 9, which cover ADO.NET, explore conceptual, architectural, and programming aspects of this and related tasks.
Visual basic application wizard update#
This means that a user can update the local cache of data in the DataSet object and then invoke a method for the data adapter that copies changes from the local data cache to the database file. As mentioned (but not demonstrated yet), data adapters are two-way pipes between an Access database file and a local dataset. By now, you should understand that a dataset contains a local cache of data that gets filled by a data adapter. The first Data Form Wizard demonstration creates a Windows form with three text boxes bound to the Freight, OrderDate, and OrderID columns in the Orders table of the Northwind database. The fourth sample takes this main/sub form to a higher level by showing aggregated data in the sub form.ĭata Access and Manipulation with TextBox Controls
The third sample presents two DataGrid controls in a main/sub form configuration. The second sample enables data manipulation via a DataGrid control. The first sample enables data access and manipulation via text boxes. However, these forms do typical database chores in a database form. The most significant point of the samples referenced from this switchboard is that the Data Form Wizard generated all their forms.
Visual basic application wizard code#
The code behind this form works identically to the code behind the switchboard form in the preceding section, except that this form s code references four samples instead of five. The form exists as Form1 in the DataFormWizSamples project. A switchboard form can succinctly summarize the topics a section covers.įigure 6-11 shows the switchboard form for this section. In spite of this application development requirement, switchboard forms are useful in tutorial presentations at the beginning of a section, such as this presentation. This is because you need to have the forms to which a switchboard directs traffic available for the code behind the switchboard form to compile properly. You will frequently build switchboard forms toward the end of an application development project.
0 kommentar(er)
