C# - Import reg file to the registry without user confirmation box

The code in answer 2 is correct, but not complete. It will work when the directory where you are refering to has no spacings in the path/file you are refering to example C:\ProgramFiles\key.reg will work fine, but C:\Program Files\key.reg WON'T WORK because there are spaces in the path.

The solution:

string directory= @"C:\Program Files (x86)\key.reg";
Process regeditProcess = Process.Start("regedit.exe", "/s \"" + directory + "\"");
regeditProcess.WaitForExit();

I tried to invoke RegEdit, but each time I got a confirm prompt (UAC enabled, no elevated permissions). Instead of RegEdit I recommand "reg.exe" (which is included in Windows since XP)

            Process proc = new Process();

            try
            {
                proc.StartInfo.FileName = "reg.exe";
                proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                proc.StartInfo.CreateNoWindow = true;
                proc.StartInfo.UseShellExecute = false;

                string command = "import " + path;
                proc.StartInfo.Arguments = command;
                proc.Start();

                proc.WaitForExit();
            }
            catch (System.Exception)
            {
                proc.Dispose();
            }

No dialog, no prompt.

The command is something like "reg import path/to/the/reg.reg"

Instead of executing a .reg file, you should be able to make your changes to the registry using the functionality provided in the Microsoft.Win32 namespace.

It is quite easy to create a registry key using this API:

RegistryKey key = Registry.CurrentUser.CreateSubKey("Names");
key.SetValue("Name", "Isabella");
key.Close();

Unless you need to create a bulk load of new keys, I believe the API is a more scalable and maintable approach. If at some point, you need decide to make it optional to write your settings in the system-wide or the per-user branch of the registry, most of your code will be reusable for both cases. Simply pick another key to do the changes upon.

Maybe more important, the API lets you specify exactly (in code) how to handle cases where the key(s) you are inserting already exists in the registry. Should i delete the existing keys and insert mine, updates values within the existing keys, silently ignore or raise an exception?