Using Data-Bound Web Controls in .NET

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The following code shows the addition of the Edit button column to the DataGrid1 Init method. The Edit button turns into an Update and Cancel button pair when the Edit button is clicked. Figure 6.15 shows the new Edit column and the browser in edit mode.
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Dim colEdit As New EditCommandColumn() colEdit.ButtonType = ButtonColumnType.PushButton colEdit.EditText = Edit colEdit.CancelText = Cancel colEdit.UpdateText = Update colEdit.ItemStyle.Width = New Unit(200, UnitType.Pixel) DataGrid1.Columns.Add(colEdit)
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The Edit and Cancel code has been added. The last item to be added to the program is the Update method. This is done by clicking the Class Name dropdown list and then clicking DataGrid1. In the Method drop-down list, click UpdateCommand, which inserts code for this event. The following code updates the ArrayList that is stored in Session( Employees ).
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Private Sub DataGrid1_UpdateCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) _ Handles DataGrid1.UpdateCommand Dim LastName As TextBox Dim FirstName As TextBox Dim Salary As TextBox LastName = CType(e.Item.Cells(DataGrid1.Attributes( _ LastNameCol )).Controls(0), TextBox) FirstName = CType(e.Item.Cells(DataGrid1.Attributes( _ FirstNameCol )).Controls(0), TextBox) Salary = CType(e.Item.Cells(DataGrid1.Attributes( _ SalaryCol )).Controls(0), TextBox) Get the row index from the DataGrid. Dim di As Integer = e.Item.DataSetIndex Get the Data from the DataGrid. Session( Employees )(di).LastName = LastName.Text Session( Employees )(di).FirstName = FirstName.Text Session( Employees )(di).Salary = Salary.Text Get EID and display it Dim EidCol As Integer EidCol = Integer.Parse(DataGrid1.Attributes( EidCol )) Dim EID As Integer EID = Integer.Parse(e.Item.Cells(EidCol).Text) Label1.Text = Employee ID Updated: & EID.ToString() DataGrid1.EditItemIndex = -1 BindEmployees() End Sub
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Using Data-Bound Web Controls
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Figure 6.15 The new edit column (left) and the browser in edit mode (right).
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In this code, references are first obtained to each of the TextBoxes that were displayed. The attributes that were saved when the columns were added can be used to select the appropriate cell. Retrieving Controls(0) gets the first control in the call, but it must be cast to a TextBox data type by using the CType function. This allows access to the Text property. Another interested property of the Item is the DataSetIndex, which contains the row number of the data source. This can easily be used to assign the modified values to Session( Employees ). The Item also contains an ItemIndex property, which contains the index number of the current item in the DataGrid. This may not be equal to the DataSetRow, especially when paging is used in the DataGrid. The last piece of the update code retrieves the EID and places its value in Label1. In these examples, the EID is considered read-only, so no attempt is made to edit or update this field.
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Lab 6.1: Data Bound Web Controls
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In this lab, you will work with the DataRepeater, DataList, and DataGrid to display a collection of categories from the category classes that were created in Lab 4.1. Displaying the Categories in a Repeater In this section, you will add a Repeater to the ProductList page. 1. Start this lab by opening the OrderEntrySolution from Lab 5.1. 2. Right-click the OrderEntrySolution in the Solution Explorer, and then click Check Out. This will check out the complete solution. 3. Right-click the Inventory project, and then click Set as Startup Project. 4. Right-click the ProductList.aspx page, and then click Set As Start Page. 5. Open the ProductList.aspx page. Add a Repeater control to the page. Rename the repeater to ProductGrid. 6. Click the HTML tab and add a header template to the ProductGrid that displays Product List with a silver background. The font should be in a large size and centered. 7. Add an item template to the ProductGrid to display the product name, price, and quantity on hand. These items should be listed on a separate line. Be sure to use the DataBinder.Eval method to display the price as a formatted currency value. 8. Add a separator template. In the separator template, add a horizontal line. 9. Add a footer template that displays End of List with a silver background. The font should be xx-small size and centered. Your HTML for the ProductsGrid should look like the following:
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<asp:repeater id=ProductGrid runat= server > <headertemplate > <div style= font-size: large; background-color: silver; text-align: center > Product List
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