WebHeaderCollection.Set sets the specified header to the specified value.
Imports System.IO Imports System.Net Imports System.Text public class MainClass Shared Sub Main() Try Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.msn.com"), HttpWebRequest) Dim myWebHeaderCollection As WebHeaderCollection = myHttpWebRequest.Headers myWebHeaderCollection.Set("Cache-Control", "no-cache") Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse) myHttpWebResponse.Close() Catch e As ArgumentException Console.WriteLine(e.Message) Catch e As WebException Console.WriteLine(e.Message) If e.Status = WebExceptionStatus.ProtocolError Then Console.WriteLine("Status Code : {0}", CType(e.Response, HttpWebResponse).StatusCode) Console.WriteLine("Status Description : {0}", CType(e.Response, HttpWebResponse).StatusDescription) Console.WriteLine("Server : {0}", CType(e.Response, HttpWebResponse).Server) End If Catch e As Exception Console.WriteLine(e.Message) End Try End Sub End Class