Programmatically Set Proxy Address, Port, Username, Password

Question

Hi I need to set proxy address of IE programmatically

Earlier I used to use this RedTomahawk.TORActivator but it doesnot gives an option to set those proxies which requi

Answer 1

You could P/Invoke the WinHttpSetDefaultProxyConfiguration function.

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UPDATE:

Including example as requested:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WINHTTP_PROXY_INFO
{
    public AccessType AccessType;
    public string Proxy;
    public string Bypass;
}

public enum AccessType
{
    DefaultProxy = 0,
    NamedProxy = 3,
    NoProxy = 1
}

class Program
{
    [DllImport("winhttp.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    public static extern bool WinHttpSetDefaultProxyConfiguration(ref WINHTTP_PROXY_INFO config);

    static void Main()
    {
        var config = new WINHTTP_PROXY_INFO();
        config.AccessType = AccessType.NamedProxy;
        config.Proxy = "http://proxy.yourcompany.com:8080";
        config.Bypass = "intranet.com";

        var result = WinHttpSetDefaultProxyConfiguration(ref config);
        if (!result)
        {
            throw new Win32Exception(Marshal.GetLastWin32Error());
        }
        else
        {
            Console.WriteLine("Successfully modified proxy settings");
        }
    }
}