HttpWebRequest.UserAgent Property


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

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

public string UserAgent { get; set; }

Property Value

Type: System.String

The value of the User-agent HTTP header. The default value is null.


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.
HttpWebRequest myHttpWebRequest=(HttpWebRequest)WebRequest.Create("");
myHttpWebRequest.UserAgent=".NET Framework Test Client";
// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse myHttpWebResponse=(HttpWebResponse)myHttpWebRequest.GetResponse();
// 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("\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.

.NET Framework
Available since 1.1
Available since 5.0
Windows Phone Silverlight
Available since 7.0
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