Programmatically Set Browser Proxy Settings in C#

Programmatically Set Browser Proxy Settings in C#

This depends somewhat on your exact needs. If you are writing a C# app and simply want to set the default proxy settings that your app will use, use the class System.Net.GlobalProxySelection (http://msdn.microsoft.com/en-us/library/system.net.globalproxyselection.aspx). You can also set the proxy for any particular connection with System.Net.WebProxy (http://msdn.microsoft.com/en-us/library/system.net.webproxy.aspx).

If you actually want to update the proxy settings in the registry, I believe that you'll need to use P/Invoke to call the WinAPI function WinHttpSetDefaultProxyConfiguration (http://msdn.microsoft.com/en-us/library/aa384113.aspx).

How to change Global Windows Proxy using C# .NET with `Immediate Effect`

The behavior I want is that when ever
I change proxy settings in my app, all
the browsers which are using global
proxy (irrespective of whether they
are running or not) should instantly
incorporate the change in settings.

How can I achieve this?

You need to refresh your system to achieve that.

Add these lines at the beginning of your code:

using System.Runtime.InteropServices;
using Microsoft.Win32;

Add this in the beginning of your class:

[DllImport("wininet.dll")]
public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);
public const int INTERNET_OPTION_SETTINGS_CHANGED = 39;
public const int INTERNET_OPTION_REFRESH = 37;
static bool settingsReturn, refreshReturn;

And imply the code:

RegistryKey registry = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);
registry.SetValue("ProxyEnable", 1);
registry.SetValue("ProxyServer", YOURPROXY);

// These lines implement the Interface in the beginning of program 
// They cause the OS to refresh the settings, causing IP to realy update
settingsReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
refreshReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);

How to change LAN Settings (proxy configuration) programmatically

You can change proxy settings by using the registry. See the following link:

http://support.microsoft.com/kb/819961

Key path: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings

Values:

"MigrateProxy"=dword:00000001
"ProxyEnable"=dword:00000001
"ProxyHttp1.1"=dword:00000000
"ProxyServer"="http://ProxyServername:80"
"ProxyOverride"="<local>"

A question in SuperUser.com regarding how to disable automatically detect settings in ie proxy configuration. Disable "Automatically detect settings" in IE proxy configuration

A snippet, taken from Internet Explorer Automatic Configuration Script Definition via Registry.

Script 1: This enables the AutoConf Script and defines what it is (exchange the http://xxxx with your script)

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"="http://xxx.xxx.xxx.xxx.xxxx"
"ProxyEnable"=dword:00000000

Script 2: This script Disables the AutoConf Script and enables a proxy server with exceptions.

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable"=dword:00000001
"ProxyOverride"="proxyexceptionname:portnumber;anotherexceptionname:port
"ProxyServer"="ftp=MyFTPProxy:Port;http=MYHTTPPROXY:PORT;https=MYHTTPSPROXY:PORT
"AutoConfigURL"=""

Programmatically Set Proxy Address, Port, User, Password throught Windows Registry

For IE, you can use the same place in the registry. Just set ProxyServer="user:password@127.0.0.1:8080" however firefox completely rejects this, and does not attempt to connect.

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