.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
function get SupportsCallback () : [%$TOPIC/5161sc90_en-us_VS_110_1_0_4_0_0%]

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: 4.6, 4.5, 4, 3.5, 3.0, 2.0