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src/JiraTimeBot/Program.cs

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+using System;
+using System.Diagnostics;
+using System.Windows.Forms;
+using JiraTimeBotForm.UI;
+
+namespace JiraTimeBotForm
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            if (PriorProcess() != null)
+            {
+
+                MessageBox.Show("Another instance of the app is already running.");
+                return;
+            }
+            
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new frmMain());
+        }
+
+        public static Process PriorProcess()
+            // Returns a System.Diagnostics.Process pointing to
+            // a pre-existing process with the same name as the
+            // current one, if any; or null if the current process
+            // is unique.
+        {
+            Process curr = Process.GetCurrentProcess();
+            Process[] procs = Process.GetProcessesByName(curr.ProcessName);
+            foreach (Process p in procs)
+            {
+                if ((p.Id != curr.Id) &&
+                    (p.MainModule.FileName == curr.MainModule.FileName))
+                    return p;
+            }
+            return null;
+        }
+    }
+}