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HttpCapabilitiesBase.SupportsCallback Property

Gets a value indicating whether the browser supports callback scripts.

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

'Declaration
Public Overridable ReadOnly Property SupportsCallback As Boolean

Property Value

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

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>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
Show:
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