HUsing ADO.NET 2.0 with Microsoft Access Databases - Cengage ...

Binding the Objects in a Dataset 13
Appendix H C5779 39147 Page 13 07/10/06--JHR
BindingNavigator control
The syntax of the EndEdit method is [Me.]bindingSourceName.EndEdit(),
where bindingSourceName is the name of the BindingSource object in the application.
The syntax of the Update method is [Me.]tableAdapterName.
Update([Me.]dataSetName.tableName). In the syntax, tableAdapterName is the
name of the TableAdapter object in the application. DataSetName is the name of
the DataSet object, and tableName is the name of the table object contained
in the dataset. The Me. in the syntax for both methods is optional, as indicated
by the square brackets; when used, it refers to the current form.
The MainForm’s Load event procedure, on the other hand, is processed
when the application is started and the form is loaded into the computer’s
internal memory. Notice that the Load procedure contains one statement:
Me.TblEmployTableAdapter.Fill(Me.EmployeesDataSet.tblEmploy).
The statement uses the TableAdapter object’s Fill method to retrieve data from
the database and store it in the dataset. The Fill method’s syntax is
[Me.]tableAdapterName.Fill([Me.]dataSetName.tableName). In the syntax,
tableAdapterName is the name of the TableAdapter object in the application.
DataSetName is the name of the DataSet object, and tableName is the name of the
table object contained in the dataset.
In most applications, the statement to fill a dataset with data belongs in the
form’s Load event procedure, as shown in Figure H.15. However, as the comments
in the Load event procedure indicate, you can move the statement to another procedure;
or, you can remove the statement from the Code Editor window.
Figure H.16 shows a sample run of the Morgan Industries application. When
the application is started, the statement in the MainForm’s Load event procedure
retrieves the appropriate data from the Employees database and loads the
data into the EmployeesDataSet object. As the figure shows, the data is displayed
in the DataGridView control, which is bound to the tblEmploy table contained
in the EmployeesDataSet.
DataGridView control
FIGURE H.16
Sample run of the Morgan Industries application
You can make a change to an existing record by modifying the data in the
appropriate cell in the DataGridView control. A cell is an intersection of a row
and column in the control. For example, to change Martha Vine’s status from