Figure 8.12 The completed DataGrid with Add, Delete, Edit, and Update DB buttons added.
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Paging the DataGrid
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A DataGrid can be set up to allow paging of data. This is especially useful when displaying a significant amout of data. Paging can be enabled by adding the following settings into the init code of the DataGrid.
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Private Sub dgEmployee_Init( _ ByVal sender As Object, _ ByVal e As System.EventArgs) Handles dgEmployee.Init dgEmployee.AllowPaging = True dgEmployee.PageSize = 10 dgEmployee.PagerStyle.Mode = PagerMode.NumericPages dgEmployee.PagerStyle.PageButtonCount = 5 dgEmployee.PagerStyle.HorizontalAlign = HorizontalAlign.Right Other code to initialize columns here End Sub
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This code turns on paging and sets the PageSize and the style of paging. Meanwhile, the following code must be added for the paging to operate.
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Private Sub dgEmployee_PageIndexChanged( _ ByVal source As Object, _ ByVal e As _ System.Web.UI.WebControls.DataGridPageChangedEventArgs) _ Handles dgEmployee.PageIndexChanged dgEmployee.CurrentPageIndex = e.NewPageIndex dgEmployee.EditItemIndex = -1 BindTable() End Sub
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This code simply changes the CurrentPageIndex to the NewPageIndex and then assures that no item is being edited. Figure 8.13 shows the DataGrid with paging enabled.
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Figure 8.13 The DataGrid with paging enabled.
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Sorting Data with the DataGrid
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A DataGrid also can allow the user to select which column to edit. Sorting is enabled by setting the AllowSorting property of the DataGrid to true in the Init method, as follows:
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dgEmployee.AllowSorting = True
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Next, the SortExpression must be set for each column for which sorting is enabled. This can be done by adding the following line of code to the DataGrid Init method for each of these columns. Be sure to add this line of code after the assignment of the DataField.
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col.SortExpression = col.DataField
Finally, code needs to be added to the DataGrid s sort command. This code will read the Sort Expression from the column and compare it with the value that was stored.
Private Sub dgEmployee_SortCommand( _ ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridSortCommandEventArgs) _ Handles dgEmployee.SortCommand Get the DataTable from the Session. Dim dt As DataTable = CType(Session( Employee ), DataTable) Dim PrevSortExpression As String = Dim PrevSortOrder As String = If Not dgEmployee.Attributes( SortExpression ) Is Nothing Then PrevSortExpression = _ dgEmployee.Attributes( SortExpression ).ToString() End If If Not dgEmployee.Attributes( SortOrder ) Is Nothing Then PrevSortOrder = dgEmployee.Attributes( SortOrder ).ToString() End If Dim NewSortOrder As String = If PrevSortExpression = e.SortExpression Then If PrevSortOrder = DESC Then NewSortOrder = ASC Else NewSortOrder = DESC End If Else NewSortOrder = ASC End If dgEmployee.Attributes( SortExpression ) = e.SortExpression dgEmployee.Attributes( SortOrder ) = NewSortOrder dt.DefaultView.Sort = e.SortExpression & & NewSortOrder BindTable() End Sub
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Figure 8.14 The sorted DataGrid, along with data paging.
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The completed DataGrid with sort capabilities is shown in Figure 8.14.
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Lab 8.1 Data Access
In this lab, you will add a new page to browse the customer table in the Northwind database. First, you will create a customer list page. After the page is created and the controls are placed on the page, you will add code to fill the DataGrid. Finally, you will test your work. Creating the Customer List Page In this section, you will create a Web page to display the customer table in the Northwind database. 1. Open the OrderEntrySolution from Lab 7.1. 2. Right-click the OrderEntrySolution in the Solution Explorer, and click Check Out to check out the complete solution. 3. Right-click the Customer project in the Solution Explorer, and then click Set As StartUp Project. 4. Right-click the Inventory project, and click Add, Add Web Form. Name the page CustomerList.aspx. 5. Change the layout to FlowLayout, which allows text to be simply typed onto the control and will push other controls downward when upper controls are too large. 6. Type Customer List at the top of the page. 7. Drag a DataGrid on to the Web Page. Change the name of the DataGrid to dgCustomers.
8. User your mouse to select everything on the page, and then click Format, Justify, Center. 9. Select the text, and change the font to Arial and the font size to 6. 10. Save your work. Figure 8.15 shows the page. Filling the DataGrid In this section, you will create a connection to the Northwind database. 1. Open the CustomerList.aspx.vb code-behind page. 2. Add an Imports state to the top of the code for System.Data and for System.Data.SqlClient. Locate the Page_Load event method and add a test to check for the postback. (If this is the first time that the page is being called, make a call to the BindTable method.) Your code should look like the following:
Imports System.Data Imports System.Data.SqlClient ....other code Private Sub Page_Load( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load If Not IsPostBack Then BindTable() End If End Sub