HospitalBrowser/BrowserUpdate/prBrowserUpdate/Program.cs

using System;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace prBrowserUpdate
{
	internal static class Program
	{
		[STAThread]
		private static void Main()
		{
			Application.EnableVisualStyles();
			Application.SetCompatibleTextRenderingDefault(defaultValue: false);
			Process instance = RunningInstance();
			if (instance == null)
			{
				Application.Run(new MainForm());
			}
			else
			{
				HandleRunningInstance(instance);
			}
		}

		private static Process RunningInstance()
		{
			Process current = Process.GetCurrentProcess();
			Process[] processesByName = Process.GetProcessesByName(current.ProcessName);
			foreach (Process process in processesByName)
			{
				if (process.Id != current.Id && Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
				{
					return process;
				}
			}
			return null;
		}

		private static void HandleRunningInstance(Process instance)
		{
			ShowWindowAsync(instance.MainWindowHandle, 3);
			SetForegroundWindow(instance.MainWindowHandle);
		}

		[DllImport("User32.dll")]
		private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);

		[DllImport("User32.dll")]
		private static extern bool SetForegroundWindow(IntPtr hWnd);
	}
}