Page.PreviousPage Property (System.Web.UI)

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PreviousPage Property

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Page..::.PreviousPage Property

Gets the page that transferred control to the current page.

Namespace: System.Web.UI
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

<BrowsableAttribute(False)> _
Public ReadOnly Property PreviousPage As Page

Visual Basic (Usage)

Dim instance As Page
Dim value As Page

value = instance.PreviousPage

[BrowsableAttribute(false)]
public Page PreviousPage { get; }

Visual C++

[BrowsableAttribute(false)]
public:
property Page^ PreviousPage {
    Page^ get ();
}

JScript

public function get PreviousPage () : Page

Property Value

Type: System.Web.UI..::.Page
The Page representing the page that transferred control to the current page.

Exceptions

Exception	Condition
InvalidOperationException	The current user is not allowed to access the previous page.

Remarks

When you use the Transfer method or cross-page posting to transfer processing from one ASP.NET page to another, the originating page contains request information that might be required for the destination page. You use the PreviousPage property to access that information

The PreviousPage property is nullNothingnullptra null reference (Nothing in Visual Basic) when the user requests that page directly from the server.

Topic	Location
How to: Determine How ASP.NET Web Pages Were Invoked	Building ASP .NET Web Applications
How to: Determine How ASP.NET Web Pages Were Invoked	Building ASP .NET Web Applications
How to: Determine How ASP.NET Web Pages Were Invoked	Building ASP .NET Web Applications in Visual Studio
How to: Determine How ASP.NET Web Pages Were Invoked	Building ASP .NET Web Applications in Visual Studio
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications in Visual Studio
How to: Pass Values Between ASP.NET Web Pages	Building ASP .NET Web Applications in Visual Studio

Examples

The following example is in two parts. The first is an ASP.NET page that uses the Transfer method, exposed in the page model as Server.Transfer("path"). The second part is the target page, which uses the PreviousPage property to get the title of the first page.

Visual Basic

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Protected Sub Page_Load(ByVal sender As Object, _
        ByVal e As EventArgs)

        Dim IsServerAvailable As Boolean

        ' If second is an even number, the server is available
        ' Replace this line with a valid check for the server.
        IsServerAvailable = (DateTime.Now.Second Mod 2 = 0)

        If Not IsServerAvailable Then
            Server.Transfer("Notify.aspx", True)
        End If
    End Sub
</script>

<html  >
<head runat="server">
    <title>Switch Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h2>Database Server is Available</h2>

    <p>This page appears if the database server 
        is available.</p>

    <p>Enter a pretend Server Name: 
        <asp:TextBox ID="serverNameText" 
        runat="server">MyDatabaseServer</asp:TextBox>
    </p>

    <p><asp:Button ID="SubmitButton" runat="server" 
        Text="Is server available?" /></p>
    </div>
    </form>
</body>
</html>

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        // If second is an even number, the server is available
        // Replace this line with a valid check for the server.
        bool IsServerAvailable = (DateTime.Now.Second % 2 == 0);

        if (!IsServerAvailable)
            Server.Transfer("Notify.aspx", true);
    }
</script>

<html  >
<head runat="server">
    <title>Switch Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h2>Database Server is Available</h2>

    <p>This page appears if the database server 
        is available.</p>

    <p>Enter a pretend Server Name: 
        <asp:TextBox ID="serverNameText" 
        runat="server">MyDatabaseServer</asp:TextBox>
    </p>

    <p><asp:Button ID="SubmitButton" runat="server" 
        Text="Is server available?" /></p>
    </div>
    </form>
</body>
</html>

Visual Basic

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Protected Sub Page_Load(ByVal sender As Object, _
        ByVal e As EventArgs)

        Dim txt As TextBox

        ' Find the server name on the previous page
        txt = CType(Page.PreviousPage.FindControl _
            ("serverNameText"), TextBox)
        If Not IsNothing(txt) Then
            prevServerName.Text = Server.HtmlEncode(txt.Text)
        Else
            prevServerName.Text = "[Name Not available]"
        End If
    End Sub
</script>

<html  >
<head runat="server">
    <title>Page A</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h2>Database Server is Not Available</h2>

    <p>This page appears if the named database server is not 
    available, but the URL displays as the main target page.</p>

    <p>Server Name (From Page.PreviousPage): 
        <asp:Label ID="prevServerName" runat="server" /></p>

    <p>Refresh the page to see if the server is now available.</p>
    </div>
    </form>
</body>
</html>

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        // Find the server name on the previous page
        TextBox txt = 
                (TextBox)Page.PreviousPage.FindControl("serverNameText");
        if (txt != null)
            prevServerName.Text = Server.HtmlEncode(txt.Text);
        else
            prevServerName.Text = "[Name Not available]";
    }
</script>

<html  >
<head runat="server">
    <title>Page A</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h2>Database Server is Not Available</h2>

    <p>This page appears if the named database server is not 
    available, but the URL displays as the main target page.</p>

    <p>Server Name (From Page.PreviousPage): 
        <asp:Label ID="prevServerName" runat="server" /></p>

    <p>Refresh the page to see if the server is now available.</p>
    </div>
    </form>
</body>
</html>

Platforms

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.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

Page Class

Page Members

System.Web.UI Namespace