how to set proxy for all user of windows using c# code..

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C#

C#4.0

how to set proxy for all user of windows using c# code..
Sir i want to set proxy Server for all user of window not for current user i am using following code but its not browser not accept it.. please help ..

private void RegistrySetting()
{
    RegistryKey registry = Registry.LocalMachine.OpenSubKey(@"Software\\Microsoft\\Windows\\CurrentVersion\\\Internet Settings", true);
    registry.SetValue("ProxyEnable",1);
    registry.SetValue("ProxyServer", txtipaddress.Text + ":8080");
    ProcessStart();
    MessageBox.Show("Please Wait Installation In Process ");
}