Using Data-Bound Web Controls in .NET

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Using Data-Bound Web Controls
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Private Sub DataGrid1_ItemDataBound(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) _ Handles DataGrid1.ItemDataBound Dim EidCol As Integer EidCol = Integer.Parse(DataGrid1.Attributes( EidCol )) If TypeOf e.Item.DataItem Is Employee Then Dim currentEmployee As Employee = _ CType(e.Item.DataItem, Employee) e.Item.Cells(EidCol).Text = _ String.Format( {0:D3} , currentEmployee.EID) End If End Sub
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Figure 6.13 shows the browser output. The first statement in this code turned off the automatic generation of the columns. If this setting were not set to false, the manual columns and the autogenerated columns would be displayed. The statements that follow set up each of the columns in order. Each column has additional formatting to set the width of the column and the alignment of the text. The last part of the code is the ItemDataBound event method. This only contains code to assign the employee ID, because the other columns were easily bound by their field name in the InitDataBind method. Another interesting item is the persistence of the column numbers. After the column was added, the column number is persisted to an attribute in the DataGrid. This means that a peek at the browser source will reveal these attributes on DataGrid1 s table. This attributes can be retrieved when binding, selecting, editing, and updating the data. The benefit of this approach is realized when more columns are added. There is no need to update the column numbers throughout the code.
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Figure 6.13 The browser output showing the DataGrid with its columns defined in the code-behind page.
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Selecting an Item The DataGrid can allow a user to select an item. This is usually desirable when only a small amount of data is being displayed and more details are desired. A common requirement is to cause a child DataGrid to refresh and display information about the item that was selected in the parent DataGrid. For example, selecting a customer may cause that customer s orders to be displayed in a child DataGrid. Making a selection involves setting the SelectedIndex to a number other than minus one (-1), which is the default. This can be done by creating an ItemCommand method, which will change the selection number. The SelectedIndex must be set before the data is bound to the DataList. After the SelectedIndex is set, a call will be made to bind the data. The following code shows the addition of a column to the top of the DataGrid1 Init method and the added ItemCommand event method:
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Private Sub DataGrid1_Init(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles DataGrid1.Init DataGrid1.AutoGenerateColumns = False Dim colSelect As New ButtonColumn() colSelect.ButtonType = ButtonColumnType.PushButton colSelect.Text = Select colSelect.CommandName = DataGrid.SelectCommandName DataGrid1.Columns.Add(colSelect) additional columns here as shown in the previous example End Sub Private Sub DataGrid1_ItemCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) _ Handles DataGrid1.ItemCommand DataGrid1.SelectedIndex = e.Item.ItemIndex Get EID and simply 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 Selected: & EID.ToString() BindEmployees() End Sub
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This code displays the EID of the selected employee in a Label control that is placed on the page as shown in Figure 6.14.
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Figure 6.14 The ItemCommand event has been used to retrieve the current employee ID and display it in a Label control.
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Editing an Item The DataGrid can allow a user to edit an item. Editing an item involves setting the EditItemIndex to a number other than minus one (-1), which is the default. This is done by clicking the Class Name drop-down list and then clicking DataGrid1. In the Method drop-down list, click EditCommand, which inserts code for this event. In this method, add code to set the EditItemIndex and call the BindEmployees method as follows:
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Private Sub DataGrid1_EditCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) _ Handles DataGrid1.EditCommand DataGrid1.EditItemIndex = e.Item.ItemIndex BindEmployees() End Sub
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The CancelCommand must be modified to set the EditItemIndex to minus one (-1) if editing is cancelled.
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Private Sub DataGrid1_CancelCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) _ Handles DataGrid1.CancelCommand DataGrid1.EditItemIndex = -1 BindEmployees() End Sub
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