Help needed using System.Diagnostics.Process

Hi, I have an external app that needed to be run when the main app starts.
I tried to use System.Diagnostics.Process, but I couldn't achieved what I wanted it to be.

My goal is :

1. When the main app starts, it first looks for a running process that has the specific name.
2. If there is no running process then create a new Process, set EnableRaisingEvents to true, add event listener to Process.Exited the start it.
3. If there is a running process, then save the process reference to my private Process field, set EnableRaisingEvents to true, add event listener to Process.Exited.

Here is the code snippet :

Code (CSharp):

1.  
2. public void InitSensor (bool _killRunningProcess = true)
3.         {
4.             status = MyApp_STATUS.OFF;
5.  
6.             Process[] processes = Process.GetProcesses();
7.             for (int i = 0; i < processes.Length; i++)
8.             {
9.                 try
10.                 {
11.                     if (!processes[i].HasExited)
12.                     {
13.                         if(processes[i].ProcessName.StartsWith("MyApp", StringComparison.InvariantCulture))
14.                         {
15.                             //HACK should not kill and attach to the running process??
16.                             if (_killRunningProcess)
17.                             {
18.                                 UnityEngine.Debug.Log("Running " + processes[i].ProcessName + " found! Restarting...");
19.                                 processes[i].Kill();
20.                                 status = MyApp_STATUS.EXITED;
21.                             }
22.                             else
23.                             {
24.                                 //HACK Exited is invoked. don't know why!!!!
25.                                 UnityEngine.Debug.Log("Running " + processes[i].ProcessName + " found! Attaching...");
26.                                 pSensor = processes[i];
27.                                 pSensor.EnableRaisingEvents = true;
28.                                 pSensor.Exited += OnSensorTerminated;
29.                                 status = MyApp_STATUS.RUNNING;
30.                             }
31.                             //UnityEngine.Debug.Log("Running " + processes[i].ProcessName + " found! Restarting...");
32.                             ////HACK not working. Don't know why
33.                             //processes[i].Kill();
34.                             //status = MyApp_STATUS.EXITED;
35.                             return;
36.                         }
37.                     }
38.                 }
39.                 catch (Exception e)
40.                 {
41.                     //UnityEngine.Debug.LogWarning(e);
42.                 }
43.             }
44.  
45.             //=== No running MyApp found. Start one.
46.             status = MyApp_STATUS.INITIALIZING;
47.  
48.             //TODO Check if pSensor != null
49.             if (pSensor != null)
50.             {
51.                 pSensor.Close();
52.                 pSensor = null;
53.             }
54.  
55.             pSensor = new Process();
56.             switch (hardware)
57.             {
58.                 case MyApp_HARDWARE.Sensor_V1 :
59.                     UnityEngine.Debug.Log("Starting MyApp for Sensor V1...");
60.                     pSensor.StartInfo.FileName = Application.streamingAssetsPath + "/MyAppSensors/MyApp_Sensor_V1.app";
61.                     break;
62.                 case MyApp_HARDWARE.Sensor_V2 :
63.                     UnityEngine.Debug.Log("Starting MyApp for Sensor V2...");
64.                     pSensor.StartInfo.FileName = Application.streamingAssetsPath + "/MyAppSensors/MyApp_Sensor_V2.app";
65.                     break;
66.                 default :
67.                     UnityEngine.Debug.Log("Starting MyApp for Sensor V1...");
68.                     pSensor.StartInfo.FileName = Application.streamingAssetsPath + "/MyAppSensors/MyApp_Sensor_V1.app";
69.                     break;
70.                
71.             }
72.             pSensor.StartInfo.CreateNoWindow = false;
73.             pSensor.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
74.             pSensor.EnableRaisingEvents = true;
75.             pSensor.Exited += OnSensorTerminated;
76.  
77.             pSensor.Start();
78.             //status = MyApp_STATUS.RUNNING; // RUNNING is set when the first data has arrived
79.         }
80.  
81.         /// <summary>
82.         /// Explicitly terminates the sensor.
83.         /// </summary>
84.         public void KillSensor()
85.         {
86.             if (pSensor != null)
87.             {
88.                 //UnityEngine.Debug.Log("Terminating MyApp...");
89.                 status = MyApp_STATUS.OFF;
90.                 if (!pSensor.HasExited)
91.                 {
92.                     pSensor.Exited -= OnSensorTerminated;
93.                     try
94.                     {
95.                         //HACK not working... don't know why
96.                         pSensor.Kill();
97.                     }
98.                     catch (Exception e)
99.                     {
100.                         UnityEngine.Debug.LogWarning(e);
101.                     }
102.                 }
103.                 pSensor.Close();
104.                 pSensor = null;
105.  
106.                 //HACK pSensor.Kill() not working.. have to implement other way
107.                 Process[] processes = Process.GetProcesses();
108.                 for (int i = 0; i < processes.Length; i++)
109.                 {
110.                     try
111.                     {
112.                         if (!processes[i].HasExited)
113.                         {
114.                             if(processes[i].ProcessName.StartsWith("MyApp", StringComparison.InvariantCulture))
115.                             {
116.                                 UnityEngine.Debug.Log("Terminating " + processes[i].ProcessName + "...");
117.                                 processes[i].Kill();
118.                                 status = MyApp_STATUS.OFF;
119.                                 return;
120.                             }
121.                         }
122.                     }
123.                     catch (Exception e)
124.                     {
125.                         //UnityEngine.Debug.LogWarning(e);
126.                     }
127.                 }
128.             }
129.             else
130.             {
131.                 UnityEngine.Debug.Log("MyApp is not running!");
132.             }
133.         }

And the problem is, I can't attach the running process to my local field. The process is assigned to pSensor, but calling pSensor.Kill() has no effect. If I do the same job by calling

Code (CSharp):

1. processes[i].Kill()

, then it works.

And if i attach the running process, then pSensor.Exited event is invoked right after assigning it / or never raised when I terminate the external sensor app. If I force stop the running process and create a new process inside my app, then the events are correctly raised.

I tried to search online documents and use examples, but couldn't find useful one. If anyone can help, it would be very grateful.