Proxy in C# Webbrowser

//Credits: Rogue: http://thebot.net/threads/c-changing-proxy-in-webbrowser-control.135271/

void RefreshIESettings(string strProxy) {
        const int INTERNET_OPTION_PROXY = 38;
        const int INTERNET_OPEN_TYPE_PROXY = 3;
        Struct_INTERNET_PROXY_INFO s_IPI;
        s_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
        s_IPI.proxy = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(strProxy);
        s_IPI.proxyBypass = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi("Global");
        IntPtr intptrStruct = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(System.Runtime.InteropServices.Marshal.SizeOf(s_IPI));
        System.Runtime.InteropServices.Marshal.StructureToPtr(s_IPI, intptrStruct, true);
        InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, System.Runtime.InteropServices.Marshal.SizeOf(s_IPI));
    }

RefreshIEsettings();