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HttpWebRequest.UserAgent Property

Gets or sets the value of the User-agent HTTP header.

Namespace:  System.Net
Assembly:  System (in System.dll)

Public Property UserAgent As String
Dim instance As HttpWebRequest 
Dim value As String 

value = instance.UserAgent

instance.UserAgent = value

Property Value

Type: System.String
The value of the User-agent HTTP header. The default value is Nothing.

The value for this property is stored in WebHeaderCollection. If WebHeaderCollection is set, the property value is lost.

The following code example sets the UserAgent property.

           ' Create a new 'HttpWebRequest' object to the mentioned URL. 
            Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(""), HttpWebRequest)
            myHttpWebRequest.UserAgent= ".NET Framework Test Client" 
            ' The response object of 'HttpWebRequest' is assigned to a 'HttpWebResponse' variable. 
            Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
            ' Display the contents of the page to the console. 
            Dim streamResponse As Stream = myHttpWebResponse.GetResponseStream()
            Dim streamRead As New StreamReader(streamResponse)
            Dim readBuff(256) As [Char]
            Dim count As Integer = streamRead.Read(readBuff, 0, 256)
            Console.WriteLine(ControlChars.Cr + "The contents of HTML Page are :" + ControlChars.Cr)
            While count > 0
                Dim outputData As New [String](readBuff, 0, count)
                count = streamRead.Read(readBuff, 0, 256)
            End While
          ' Release the response object resources.
// Create a new 'HttpWebRequest' object to the mentioned URL.
HttpWebRequest* myHttpWebRequest =
myHttpWebRequest->UserAgent = S".NET Framework Test Client";
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse* myHttpWebResponse =
// Display the contents of the page to the console.
Stream* streamResponse = myHttpWebResponse->GetResponseStream();
StreamReader* streamRead = new StreamReader(streamResponse);
Char readBuff[] = new Char[256];
int count = streamRead->Read(readBuff, 0, 256);
Console::WriteLine(S"\nThe contents of HTML Page are :\n");
while (count > 0) {
   String* outputData = new String(readBuff, 0, count);
   count = streamRead->Read(readBuff, 0, 256);
// Release the response object resources.

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0