Web Camera Hangs when I try to open it to recognize the detected face using Emgu CV

Question

I am developing Teacher Attendance Management System using face recognition technique in C# using Emgu CV, first of all teachers' faces will be trained (registered) then their attendance will be marked using Face Recognition technique. But whenever I try to open camera for face recognition it freezes after some seconds and does not respond. First I thought it is because of continuously attempt oof insertion of attendance into database (primary key in Attendance table is name + date so no duplicate attendance will be marked of a teacher) but when I commented out all code related to database it freezes too. Anyone knows how can I overcome this issue ? Here is my FrameProceedure methode it will run when my form will be loaded as follows Application.Idle += new EventHandler(FrameProcedure);

FrameProceedure Method :

private void FrameProcedure(object sender, EventArgs e)
        {
            try
            {
                // Thread.Sleep(1000);
                Users.Add("");
                Frame = camera.QueryFrame().Resize(320, 240, Emgu.CV.CvEnum.INTER.CV_INTER_CUBIC);
                grayFace = Frame.Convert<Gray, Byte>();
                MCvAvgComp[][] facesDetectedNow = grayFace.DetectHaarCascade(faceDetected, 1.2, 10, Emgu.CV.CvEnum.HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, new Size(20, 20));
                foreach (MCvAvgComp f in facesDetectedNow[0])
                {
                    result = Frame.Copy(f.rect).Convert<Gray, Byte>().Resize(100, 100, Emgu.CV.CvEnum.INTER.CV_INTER_CUBIC);
                    Frame.Draw(f.rect, new Bgr(Color.Green), 3);
                    if (trainingImages.ToArray().Length != 0)
                    {

                        MCvTermCriteria termCriterias = new MCvTermCriteria(Count, 0.001);
                        EigenObjectRecognizer recognizer = new EigenObjectRecognizer(trainingImages.ToArray(), labels.ToArray(), 1500, ref termCriterias);
                        name = recognizer.Recognize(result);
                        Frame.Draw(name, ref font, new Point(f.rect.X - 2, f.rect.Y - 2), new Bgr(Color.Red));

                        if (name != null)
                        {
                            try
                            {

                                MySqlConnection databaseConnection = new MySqlConnection(connString);
                                int id = 0;
                                MySqlCommand cmd;

                                //Check if the face recognized exists in the Registration Table then retrieve its ID to store in Attendance Table

                                cmd = new MySqlCommand("SELECT id FROM mydb.registration WHERE name = @n", databaseConnection);
                                cmd.Parameters.Add("@n", MySqlDbType.Text);
                                cmd.Parameters["@n"].Value = name;
                                MySqlDataReader myReader;

                                databaseConnection.Open();
                                myReader = cmd.ExecuteReader();
                                while (myReader.Read())
                                {
                                    id = (int)(myReader["id"]);

                                }
                                databaseConnection.Close();
                                //If ID is retrieved successfully (means face exists in Registration Table)  
                                if (id != 0)
                                {
                                    MySqlConnection dbconn = new MySqlConnection(connString);
                                    dbconn.Open();
                                    MySqlCommand comm = dbconn.CreateCommand();
                                    comm.CommandText = "UPDATE mydb.attendance SET att_status = @status WHERE id = '" + id + "' AND att_status = '' AND name = '" + name + "' AND att_status = ''";
                                    comm.Parameters.Add("?status", MySqlDbType.VarChar).Value = "P";
                                    comm.ExecuteNonQuery();
                                    dbconn.Close();
                                   Frame.Draw(name + " Marked Present", ref font, new Point(f.rect.X - 2, f.rect.Y - 2), new Bgr(Color.Yellow));
                                    SystemSounds.Beep.Play();
                                }
                            }
                            catch (Exception ee)
                            {
                                 ```
                            }
                        }                 
                        Users.Add("");
                    }
                    imageBox1.Image = Frame;
                    names = "";
                    Users.Clear();
                }
            }
            catch (Exception ee)
            {
                //  MessageBox.Show(ee.ToString());
            }
        }