Panel Control

Definition and Usage

The Panel control is used as a container for other controls.

Tip: This control is often used to generate controls by code and to display and hide groups of controls.

Note: This control renders as an HTML <div> element.

Properties

Property	Description
BackImageUrl	Specifies a URL to an image file to display as a background for this control
HorizontalAlign	Specifies the horizontal alignment of the content. Legal values are: Center Justify Left NotSet Right
id	A unique id for the control
runat	Specifies that the control is a server control. Must be set to "server"
Wrap	A Boolean value that specifies whether the content should wrap or not

Example 1

In the following example we declare one Panel control, one DropDownList control, one CheckBox control, and one Button control in an .aspx file. When the user checks the CheckBox control, and the clicks the Refresh button, the Panel control will hide. The user can also choose how many text-boxes that should be displayed in the Panel control, by selecting a number in the drop-down list:

<script runat="server">
  Sub Page_Load(sender As Object, e As EventArgs)
    if chk.Checked then
      p.Visible=false
    else
      p.Visible=true
    end if

    dim n,i
    n=txtbox.SelectedItem.Value
    for i=1 to n
      Dim t As New TextBox()
      t.Text="TextBox " & i
      p.Controls.Add(t)
      p.Controls.Add(New LiteralControl("<br>"))
    next
  End Sub
</script>

<html>
<body>
<form runat="server">

<asp:Panel id="p" runat="server" BackColor="yellow"
Height="200px" Width="200px">Hello World!!!!!!!!!!!!
</asp:Panel>

<p>Create TextBoxes:
<asp:DropDownList id=txtbox runat="server">
<asp:ListItem Value="0">0</asp:ListItem>
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
</asp:DropDownList>
</p>
<p>
asp:CheckBox id="chk" Text="Hide Panel control"
runat="server"/>
</p>
<p>
<asp:Button Text="Refresh" runat="server"/>
</p>

</form>
</body>
</html>

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