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Template columns You are in full control of template controls, and in fact you must specify templates for normal items, alternate items, selected items, and edited items. Each template can contain literal HTML text and one or more con trols that can be bound to the data source. For example, you can use a template column to render a Boolean field by means of a CheckBox control, a lookup field with a DropDownList control, an enumerated value with a set of RadioButton con trols, an Image control for a field that contains a picture, and so on.

Figure 25-13 shows the DataGrid control created by the demo application. This is the column collection used to generate its columns:

Tip Format Painter is a nifty tool that allows you to copy multiple formatting characteristics from one element to another. To copy formatting to only one element, click the Format Painter button once. To copy formatting to multiple elements, doubleclick the Format Painter button. The feature will then remain active until you either press the Esc key or click the Format Painter button again.

<asp:datagrid id="dgrTitles runat="server AutoGenerateColumns="False"> <Columns> <asp:TemplateColumn HeaderText="[ ]"> <ItemTemplate> <asp:CheckBox id="chkSelect runat="server /> </ItemTemplate> </asp:TemplateColumn> <asp:BoundColumn DataField="title HeaderText="Title /> <asp:TemplateColumn HeaderText="Publisher"> <ItemTemplate> <asp:Label id=lblPublisher runat="server Text= <%# Container.DataItem.Row.GetParentRow( PubsTitles )( pub_name ) %> /> </ItemTemplate> <EditItemTemplate> <asp:DropDownList id="ddlPublishers runat="server DataTextField="pub_name DataValueField="pub_id /> </EditItemTemplate> </asp:TemplateColumn> <asp:BoundColumn DataField="type HeaderText="Type"> <HeaderStyle Width="80px /> </asp:BoundColumn> <asp:BoundColumn DataField="price HeaderText="Price"> <HeaderStyle Width="50px /> <asp:EditCommandColumn ButtonType="PushButton UpdateText="Update HeaderText="Edit CancelText="Cancel EditText="Edit /> <asp:ButtonColumn Text="Delete ButtonType="PushButton HeaderText="Delete CommandName="Delete /> <asp:HyperLinkColumn Text="Publisher DataNavigateUrlField="pub_id DataNavigateUrlFormatString="/showpubs.aspx pub_id={0} HeaderText="More info /> </Columns> </asp:datagrid>

The option that you select depends on the importance of data integrity and synchronization. You should remember that if you ask for a Reliable or ReliableInOrder transfer, this means that the transfer is slower and involves more effort to manage. In effect, the system must manage a virtual call to implement ReliableInorder. It must wait for late packets so that they can be given to your program in order, and it must also request retransmission of lost ones. On the other hand, selecting None means that data arrives more quickly, but some pieces of the data might be missing or out of order. In our game, it does not really matter if messages are missing or out of order; all that happens in that case is that the ball or bats might seem to jump slightly. However, because the data is small and the systems are on the same network, I ve selected the ReliableInOrder setting. You might like to experiment with other ones. The next thing the host must do is read the position of the player 2 bat. This is managed by the client game, which uses a call of SendData to transfer the data to the host. To read data is actually very easy; it is done as follows:

The Publisher column is a template column because you want to use a DropDownList control to let the user select a publisher when the element is being edited. The first col umn is also a template column, which you use to display a CheckBox control. The user can select one or more titles and then click the leftmost button at the bottom to evalu ate the sum of the prices of selected titles.

25:

Figure 25-13

See Also For information about grouped objects, see Connecting and Grouping Shapes in 2, Creating Visual Interest.

The easiest way to set column properties is by right-clicking the DataGrid, clicking Property Builder on the shortcut menu, and using the Columns page of the Properties dialog box. (See Figure 25-14.) After you create one or more template columns, you can right-click the DataGrid control, point to Edit Template, and click the column on the shortcut menu to edit the template in a visual way, as you did with the DataList control.

Figure 25-14

while (localHost.IsDataAvailable) { NetworkGamer sender; localHost.ReceiveData(reader, out sender); char messageType = reader.ReadChar(); if (messageType == 'P') { Player2Bat.XPos = reader.ReadSingle(); Player2Bat.YPos = reader.ReadSingle(); } }

The last column is a hyperlink column. It s interesting to see how the hyperlink is gen erated for each row in the DataGrid. The value of the DataNavigateUrlFormatString attribute is a .NET formatting string; it contains a {0} element, which is replaced by the

Part VI:

value provided by the field pointed to by DataNavigateUrlField. For example, this col umn generates URLs like these: