.NET Framework Class Library
HttpCapabilitiesBaseSupportsCallback Property

Gets a value indicating whether the browser supports callback scripts.

Namespace:   System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)
Syntax
Public Overridable ReadOnly Property SupportsCallback As [%$TOPIC/5161sc90_en-us_VS_110_1_0_0_0_0%]
public virtual [%$TOPIC/5161sc90_en-us_VS_110_1_0_1_0_0%] SupportsCallback { get; }
public:
virtual property [%$TOPIC/5161sc90_en-us_VS_110_1_0_2_0_0%] SupportsCallback {
	[%$TOPIC/5161sc90_en-us_VS_110_1_0_2_0_1%] get ();
}
abstract SupportsCallback : [%$TOPIC/5161sc90_en-us_VS_110_1_0_3_0_0%] with get 
override SupportsCallback : [%$TOPIC/5161sc90_en-us_VS_110_1_0_3_0_1%] with get

Property Value

Type: SystemBoolean
true if the browser supports callback scripts; otherwise, false. The default is false.
Examples

The following code example shows how to determine whether the browser supports callback scripts.

<%@ 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">
    Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        CheckBrowserCaps()
    End Sub

    Function CheckBrowserCaps()

        Dim labelText As String = ""
        Dim myBrowserCaps As System.Web.HttpBrowserCapabilities = Request.Browser
        If (CType(myBrowserCaps, System.Web.Configuration.HttpCapabilitiesBase)).SupportsCallback Then
            labelText = "Browser supports callback scripts."
        Else
            labelText = "Browser does not support callback scripts."
        End If

        Label1.Text = labelText

    End Function 'CheckBrowserCaps
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </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">
    void Page_Load(Object Sender, EventArgs e)
    {
        CheckBrowserCaps();
    }

    void CheckBrowserCaps()
    {
        String labelText = "";
        System.Web.HttpBrowserCapabilities myBrowserCaps = Request.Browser;
        if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).SupportsCallback)
        {
            labelText = "Browser supports callback scripts.";
        }
        else
        {
            labelText = "Browser does not support callback scripts.";
        }

        Label1.Text = labelText;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>
Version Information

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0
Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.