Adding Controls
You can add server-side controls to a Web
Form in two ways: manually, by
writing HTML
into the HTML page, or by dragging controls from the toolbox to the
Design page. For example, suppose you want to use buttons to let the
user choose one of three Shippers provided in the Northwinds
database. You could write the following HTML into the
<form>
element in the HTML window:
<asp:RadioButton GroupName="Shipper" id="Airborne" text = "Airborne Express" Checked="True" runat="server"> </asp:RadioButton> <asp:RadioButton GroupName="Shipper" id="UPS" text = "United Parcel Service" runat="server"> </asp:RadioButton> <asp:RadioButton GroupName="Shipper" id="Federal" text = "Federal Express" runat="server"> </asp:RadioButton>
The asp
tags declare server-side
ASP.NET controls that are replaced with
normal HTML when the server processes the page. When you run the
application, the browser displays three radio buttons in a button
group; pressing one will deselect the others.
You can create the same effect more easily by dragging three buttons from the Visual Studio toolbox onto the Form, as illustrated in Figure 15-3.
Figure 15-3. Dragging buttons onto the Web Form
You can add controls to a page in one of two modes. The default mode
is LinearLayout
. When you
add controls in LinearLayout
, they are displayed by the browser one after the other. You are responsible for adding HTML to assist ...
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