Panel Web Server Control Declarative Syntax
Provides a container for other controls. This control is rendered as an HTML <div> element.
<asp:Panel
AccessKey="string"
BackColor="color name|#dddddd"
BackImageUrl="uri"
BorderColor="color name|#dddddd"
BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|
Inset|Outset"
BorderWidth="size"
CssClass="string"
DefaultButton="string"
Direction="NotSet|LeftToRight|RightToLeft"
Enabled="True|False"
EnableTheming="True|False"
EnableViewState="True|False"
Font-Bold="True|False"
Font-Italic="True|False"
Font-Names="string"
Font-Overline="True|False"
Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium|
Large|X-Large|XX-Large"
Font-Strikeout="True|False"
Font-Underline="True|False"
ForeColor="color name|#dddddd"
GroupingText="string"
Height="size"
HorizontalAlign="NotSet|Left|Center|Right|Justify"
ID="string"
OnDataBinding="DataBinding event handler"
OnDisposed="Disposed event handler"
OnInit="Init event handler"
OnLoad="Load event handler"
OnPreRender="PreRender event handler"
OnUnload="Unload event handler"
runat="server"
ScrollBars="None|Horizontal|Vertical|Both|Auto"
SkinID="string"
Style="string"
TabIndex="integer"
ToolTip="string"
Visible="True|False"
Width="size"
Wrap="True|False"
/>
Remarks
The Panel control is a container for other controls. It is especially useful for generating controls programmatically and displaying and hiding groups of controls. You can display an image in the background of the Panel control by setting the BackImageUrl property. Using the HorizontalAlignment property, you can specify the horizontal alignment of the items contained in the control. The Wrap property lets you determine whether items in the control automatically continue on the next line when a line is longer than the width of the panel.
For detailed information on the Panel Web server control's properties and events, see the Panel class documentation.
Example
The following example demonstrates how to use a Panel control to display and hide a group of controls.
Note
The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model.
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Panel Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
' Show or Hide the Panel contents.
If Check1.Checked Then
Panel1.Visible = False
Else
Panel1.Visible = True
End If
' Generate the Label controls.
Dim numlabels As Integer = Int32.Parse(DropDown1.SelectedItem.Value)
Dim i As Integer
For i = 1 To numlabels
Dim l As New Label()
l.Text = "Label" + i.ToString()
l.ID = "Label" + i.ToString()
Panel1.Controls.Add(l)
Panel1.Controls.Add(New LiteralControl("<br />"))
Next i
' Generate the Textbox controls.
Dim numtexts As Integer = Int32.Parse(DropDown2.SelectedItem.Value)
For i = 1 To numtexts
Dim t As New TextBox()
t.Text = "TextBox" & i.ToString()
t.ID = "TextBox" & i.ToString()
Panel1.Controls.Add(t)
Panel1.Controls.Add(New LiteralControl("<br />"))
Next i
End Sub
</script>
</head>
<body>
<h3>Panel Example</h3>
<form id="form1" runat="server">
<asp:Panel id="Panel1" runat="server"
BackColor="gainsboro"
Height="200px"
Width="300px">
Panel1: Here is some static content...
<br />
</asp:Panel>
<br />
Generate Labels:
<asp:DropDownList id="DropDown1" 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:ListItem Value="4">4</asp:ListItem>
</asp:DropDownList>
<br />
Generate TextBoxes:
<asp:DropDownList id="DropDown2" 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:ListItem Value="4">4</asp:ListItem>
</asp:DropDownList>
<br />
<asp:CheckBox id="Check1" Text="Hide Panel" runat="server"/>
<br />
<asp:Button Text="Refresh Panel" runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Panel Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e) {
// Show or hide the Panel contents.
if (Check1.Checked) {
Panel1.Visible=false;
}
else {
Panel1.Visible=true;
}
// Generate the Label controls.
int numlabels = Int32.Parse(DropDown1.SelectedItem.Value);
for (int i=1; i<=numlabels; i++) {
Label l = new Label();
l.Text = "Label" + (i).ToString();
l.ID = "Label" + (i).ToString();
Panel1.Controls.Add(l);
Panel1.Controls.Add(new LiteralControl("<br />"));
}
// Generate the Textbox controls.
int numtexts = Int32.Parse(DropDown2.SelectedItem.Value);
for (int i=1; i<=numtexts; i++) {
TextBox t = new TextBox();
t.Text = "TextBox" + (i).ToString();
t.ID = "TextBox" + (i).ToString();
Panel1.Controls.Add(t);
Panel1.Controls.Add(new LiteralControl("<br />"));
}
}
</script>
</head>
<body>
<h3>Panel Example</h3>
<form id="form1" runat="server">
<asp:Panel id="Panel1" runat="server"
BackColor="gainsboro"
Height="200px"
Width="300px">
Panel1: Here is some static content...
<br />
</asp:Panel>
<br />
Generate Labels:
<asp:DropDownList id="DropDown1" 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:ListItem Value="4">4</asp:ListItem>
</asp:DropDownList>
<br />
Generate TextBoxes:
<asp:DropDownList id="DropDown2" 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:ListItem Value="4">4</asp:ListItem>
</asp:DropDownList>
<br />
<asp:CheckBox id="Check1" Text="Hide Panel" runat="server"/>
<br />
<asp:Button Text="Refresh Panel" runat="server"/>
</form>
</body>
</html>