Provides the capability to group controls together.
(in System.Web.Mobile.dll)
Visual Basic (Declaration)
<DesignerAdapterAttribute(GetType(HtmlFormAdapter))> _
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class Form _
Inherits Panel _
Implements ITemplateable, IPostBackEventHandler
[DesignerAdapterAttribute(typeof(HtmlFormAdapter))]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class Form : Panel, ITemplateable, IPostBackEventHandler
[DesignerAdapterAttribute(typeof(HtmlFormAdapter))]
[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction::InheritanceDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public ref class Form : public Panel,
ITemplateable, IPostBackEventHandler
public class Form extends Panel implements ITemplateable, IPostBackEventHandler
A form represents the outermost grouping of controls within an ASP.NET mobile Web page. An individual mobile Web page can contain multiple forms at the outermost level. Forms cannot be nested; use Panel controls if you want to nest containers. For more information, see Introduction to the Form Control. To display a specific form, either set the ActiveForm property on the current page to the desired form, or set the NavigateUrl property in a Link control to the desired form. You can include literal text along with its accompanying markup tags in the text contents of the Form control. When using templates, it is important to remember that the Form control creates instances of templates in the OnInit method for the form. The OnInit method for the form is called before Page_Load and Page_Init. Also, the page constructor executes too early to set templates in the OnInit method because the form is not yet created. To correct this, hook the form's own OnInit method, and create an instance of the template there. For more information, see Implementing Templated Rendering.
The following code example shows how to create a page with two forms along with links between the two forms. One form has a check box list. When items are selected and the Submit button is clicked, the form presents a list of the selected items and their values. Notice that the Activate event methods prepare the respective forms for display
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The following code example uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code example must be copied into an empty text file that has an .aspx extension. For more information, see >ASP.NET Web Page Syntax Overview |
<%@ Page Language="VB"
Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile"
Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.UI.MobileControls" %>
<%@ Import Namespace="System.Drawing" %>
<script runat="server">
' When Form1 is activated
Private Sub Form1_Activate(ByVal sender As Object, _
ByVal e As EventArgs)
Dim viewText As String = "You have viewed this Form {0} times."
' First viewing
If (count = 0) Then
message2.Text = "Welcome to the Form Sample"
Else ' subsequent viewings
message2.Text = String.Format(viewText, _
(count + 1).ToString())
End If
' Format the form
Form1.Alignment = Alignment.Center
Form1.Wrapping = Wrapping.NoWrap
Form1.BackColor = Color.LightBlue
Form1.ForeColor = Color.Blue
Form1.Paginate = True
' Create an array and add the tasks to it.
Dim arr As ArrayList = New ArrayList()
arr.Add(New Task("Verify transactions", "Done"))
arr.Add(New Task("Check balance sheet", "Scheduled"))
arr.Add(New Task("Send report", "Pending"))
' Bind the SelectionList to the array.
SelectionList1.DataValueField = "Status"
SelectionList1.DataTextField = "TaskName"
SelectionList1.DataSource = arr
SelectionList1.DataBind()
End Sub
' When Form1 is deactivated
Private Sub Form1_Deactivate(ByVal sender As Object, _
ByVal e As EventArgs)
count += 1
End Sub
' When Form2 is activated
Private Sub Form2_Activate(ByVal sender As Object, _
ByVal e As EventArgs)
Form2.BackColor = Color.DarkGray
Form2.ForeColor = Color.White
Form2.Font.Bold = BooleanOption.True
End Sub
' The the Submit button is clicked
Protected Sub Command1_OnSubmit(ByVal sender As Object, _
ByVal e As EventArgs)
Dim i As Integer
message2.Text = "FORM RESULTS:"
message2.Font.Bold = BooleanOption.True
' Create a string and a TextView control
Dim txtView As TextView = New TextView()
Dim txt As String = ""
Dim spec As String = "{0} is {1}<br />"
' Display a list of selected items with values
For i = 0 To SelectionList1.Items.Count - 1
' Get the ListItem
Dim itm As MobileListItem = SelectionList1.Items(i)
' List the selected items and values
If itm.Selected Then
txt &= String.Format(spec, itm.Text, itm.Value)
End If
Next
' Put the text into the TextView
txtView.Text = txt
' Add the TextView to the form
Form1.Controls.Add(txtView)
' Hide unnecessary controls
SelectionList1.Visible = False
link1.Visible = False
Command1.Visible = False
End Sub
' Property to persist the count between postbacks
Private Property count() As Integer
Get
Dim o As Object = ViewState("FormCount")
If IsNothing(o) Then
Return 0
Else
Return CType(o, Integer)
End If
End Get
Set(ByVal value As Integer)
ViewState("FormCount") = value
End Set
End Property
' A custom class for the task array
Private Class Task
Private _TaskName As String
Private _Status As String
Public Sub New(ByVal TaskName As String, ByVal Status As String)
_TaskName = TaskName
_Status = Status
End Sub
Public ReadOnly Property TaskName() As String
Get
Return _TaskName
End Get
End Property
Public ReadOnly Property Status() As String
Get
Return _Status
End Get
End Property
End Class
</script>
<html xmlns="http:'www.w3.org/1999/xhtml" >
<body>
<!-- The first form: Form1 -->
<mobile:Form ID="Form1" Runat="server"
OnDeactivate="Form1_Deactivate"
OnActivate="Form1_Activate">
<mobile:Label ID="message1" Runat="server">
Welcome to ASP.NET
</mobile:Label>
<mobile:Label ID="message2" Runat="server" />
<mobile:SelectionList Runat="server"
ID="SelectionList1"
ForeColor="red" SelectType="CheckBox" />
<mobile:Link ID="link1" Runat="server"
NavigateUrl="#Form2"
Text="Next Form" /><br />
<mobile:Command ID="Command1" Runat="server"
Text="Submit" OnClick="Command1_OnSubmit" />
</mobile:Form>
<!-- The second form: Form2 -->
<mobile:Form ID="Form2" Runat="server"
OnActivate="Form2_Activate">
<mobile:Label ID="message4" Runat="server">
Welcome to ASP.NET
</mobile:Label>
<mobile:Link ID="Link2" Runat="server"
NavigateUrl="#Form1" Text="Back" />
</mobile:Form>
</body>
</html>
<%@ Page Language="C#"
Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile"
Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.UI.MobileControls" %>
<%@ Import Namespace="System.Drawing" %>
<script runat="server">
// When Form1 is activated
private void Form1_Activate(object sender, EventArgs e)
{
string viewText = "You have viewed this Form {0} times.";
if (count == 0) // First viewing
message2.Text = "Welcome to the Form Sample";
else // subsequent viewings
message2.Text = String.Format(viewText,
(count + 1).ToString());
// Format the form
Form1.Alignment = Alignment.Center;
Form1.Wrapping = Wrapping.NoWrap;
Form1.BackColor = Color.LightBlue;
Form1.ForeColor = Color.Blue;
Form1.Paginate = true;
// Create an array and add the tasks to it.
ArrayList arr = new ArrayList();
arr.Add(new Task("Verify transactions", "Done"));
arr.Add(new Task("Check balance sheet", "Scheduled"));
arr.Add(new Task("Send report", "Pending"));
// Bind the SelectionList to the array.
SelectionList1.DataValueField = "Status";
SelectionList1.DataTextField = "TaskName";
SelectionList1.DataSource = arr;
SelectionList1.DataBind();
}
// When Form1 is deactivated
private void Form1_Deactivate(object sender, EventArgs e)
{
count++;
}
// When Form2 is activated
private void Form2_Activate(object sender, EventArgs e)
{
Form2.BackColor = Color.DarkGray;
Form2.ForeColor = Color.White;
Form2.Font.Bold = BooleanOption.True;
}
// The the Submit button is clicked
protected void Command1_OnSubmit(object sender, EventArgs e)
{
message2.Text = "FORM RESULTS:";
message2.Font.Bold = BooleanOption.True;
// Display a list of selected items with values
for (int i = 0; i < SelectionList1.Items.Count; i++)
{
// Create a string and a TextView control
TextView txtView = new TextView();
string txt = "";
string spec = "{0} is {1}<br />";
// Display a list of selected items with values
// Get the list item
MobileListItem itm = SelectionList1.Items[i];
// List the selected items and values
if (itm.Selected)
{
txt += String.Format(spec, itm.Text, itm.Value);
}
// Put the text into the TextView
txtView.Text = txt;
// Add txtView to the form
Form1.Controls.Add(txtView);
}
// Hide unnecessary controls
SelectionList1.Visible = false;
link1.Visible = false;
Command1.Visible = false;
}
// Property to persist the count between postbacks
private int count
{
get
{
object o = ViewState["FormCount"];
return o == null ? 0 : (int)o;
}
set { ViewState["FormCount"] = value; }
}
// A custom class for the task array
private class Task
{
private String _TaskName;
private String _Status;
public Task(String TaskName, String Status)
{
_TaskName = TaskName;
_Status = Status;
}
public String TaskName
{
get { return _TaskName; }
}
public String Status
{
get { return _Status; }
}
}
</script>
<html >
<body>
<!-- The first form: Form1 -->
<mobile:Form ID="Form1" Runat="server"
OnDeactivate="Form1_Deactivate"
OnActivate="Form1_Activate">
<mobile:Label ID="message1" Runat="server">
Welcome to ASP.NET
</mobile:Label>
<mobile:Label ID="message2" Runat="server" />
<mobile:SelectionList Runat="server"
ID="SelectionList1"
ForeColor="red" SelectType="CheckBox" />
<mobile:Link ID="link1" Runat="server"
NavigateUrl="#Form2"
Text="Next Form" /><br />
<mobile:Command ID="Command1" Runat="server"
Text="Submit" OnClick="Command1_OnSubmit" />
</mobile:Form>
<!-- The second form: Form2 -->
<mobile:Form ID="Form2" Runat="server"
OnActivate="Form2_Activate">
<mobile:Label ID="message4" Runat="server">
Welcome to ASP.NET
</mobile:Label>
<mobile:Link ID="Link2" Runat="server"
NavigateUrl="#Form1" Text="Back" />
</mobile:Form>
</body>
</html>
System..::.Object
System.Web.UI..::.Control
System.Web.UI.MobileControls..::.MobileControl
System.Web.UI.MobileControls..::.Panel
System.Web.UI.MobileControls..::.Form
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1
Reference
Other Resources