.NET/C# Writing and Reading the Registry.

Quick examples using System.Microsoft.Win32.

Set a key value:

string RunKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Run";
using(RegistryKey RK = Registry.CurrentUser.OpenSubKey(RunKey, true)) {
	RK.SetValue("MyProgram", @"C:\MyProgram\MyProgram.exe");
	RK.Close();
}

Create a new key with values:

string SettingsKey = @"SOFTWARE\MyProgram";
using(RegistryKey RK = Registry.CurrentUser.CreateSubKey(SettingsKey)) {
	RK.SetValue("ID", txtProgramID.Text);
	RK.SetValue("IP", txtServerIP.Text);
	RK.SetValue("Port", txtServerPort.Text);
	RK.Close();
}

Read values:

string SettingsKey = @"SOFTWARE\MyProgram";
using(RegistryKey RK = Registry.CurrentUser.OpenSubKey(SettingsKey)) {
	txtProgramID.Text = RK.GetValue("ID").ToString();
	txtServerIP.Text = RK.GetValue("IP").ToString();
	txtServerPort.Text = RK.GetValue("Port").ToString();
	RK.Close();
}

Delete values:

string RunKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Run";
using(RegistryKey RK = Registry.CurrentUser.OpenSubKey(RunKey, true)) {
	RK.DeleteValue("MyProgram", false);
	RK.Close();
}

Delete keys:

RunKey = @"SOFTWARE";
using(RegistryKey RK = Registry.CurrentUser.OpenSubKey(RunKey, true)) {
	RK.DeleteSubKey("MyProgram", false);
	RK.Close();
}

NOTE: Check out Settings.settings and the AppData folder as alternatives to using the registry.