Add project

src/Program.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Program_Hide
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        /// 
+
+        [DllImport("user32.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        static extern bool SetForegroundWindow(IntPtr hWnd);
+
+
+
+        [STAThread]
+        static void Main()
+        {
+            bool createdNew = true;
+            using (Mutex mutex = new Mutex(true, "MyApplicationName", out createdNew))
+            {
+                if (createdNew)
+                {
+                    Application.EnableVisualStyles();
+                    Application.SetCompatibleTextRenderingDefault(false);
+                    Application.Run(new Form1());
+                }
+                else
+                {
+                    Process current = Process.GetCurrentProcess();
+                    foreach (Process process in Process.GetProcessesByName(current.ProcessName))
+                    {
+                        if (process.Id != current.Id)
+                        {
+                            SetForegroundWindow(process.MainWindowHandle);
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}