//View Refill Request button click event
        private void viewRefillRequestsButton_Click(object sender, EventArgs e)
        {
            if (!(newRefillRequestsListView.SelectedIndices.Count == 0))
            {
                selectedRefillRequest = (RefillRequest)RefillRequest.displayRefillRequests()[newRefillRequestsListView.SelectedIndices[0]];    //get the selected refill request
                listView1.Items.Clear();
                listView2.Items.Clear();

                selectedRefillRequest.Prescription.retrieveMedicines();                        //retrieve all medicines of the requested prescription
                Patient patient = selectedRefillRequest.Prescription.retrievePatientDetails(); //retrieve the details of the patient who requested the refill

                int i = 0;
                foreach (Medicine medicine in patient.MedicineHistory)
                {
                    listView1.Items.Add(medicine.Date);
                    listView1.Items[i].SubItems.Add(medicine.Name);
                    listView1.Items[i].SubItems.Add("" + medicine.Quantity);
                    listView1.Items[i].SubItems.Add(medicine.Dosage);
                    i++;
                }
                i = 0;
                foreach (Medicine medicine in selectedRefillRequest.Prescription.Medicines)
                {
                    listView2.Items.Add(medicine.Name);
                    listView2.Items[i].SubItems.Add("" + medicine.Quantity);
                    listView2.Items[i].SubItems.Add(medicine.Dosage);
                    listView2.Items[i].SubItems.Add(medicine.Route);
                    listView2.Items[i].SubItems.Add(medicine.Instructions);
                    i++;
                }

                //Display patient information
                generalListView.Items.Clear();
                generalListView.Items.Add("Name: " + patient.Name);
                generalListView.Items.Add("Date of Birth: " + patient.BirthDate);
                generalListView.Items.Add("Height: " + patient.Height);
                generalListView.Items.Add("Weight: " + patient.Weight);
                generalListView.Items.Add("Body Mass Index: " + patient.BodyMassIndex);
                dateLabel.Text      = selectedRefillRequest.Date;
                statusLabel.Text    = selectedRefillRequest.Status;
                refillsLabel.Text   = "" + selectedRefillRequest.Prescription.Refills;
                remainingLabel.Text = "" + selectedRefillRequest.Prescription.RemainingRefills;
                allergyTextBox.Text = patient.Allergies;

                //Disable or enable Accept and Deny buttons depending on RefillRequest status
                if (selectedRefillRequest.Status.ToLower().Equals("new"))
                {
                    acceptButton.Enabled = true;
                    rejectButton.Enabled = true;
                }
                else
                {
                    acceptButton.Enabled = false;
                    rejectButton.Enabled = false;
                }

                newRefillRequestsPanel.Hide();
                prescriptionDetailPanel.Show();
            }
        }
        //display refill requests in the refill requests listview
        public void populateList()
        {
            newRefillRequestsListView.Items.Clear();
            int i = 0;

            foreach (RefillRequest request in RefillRequest.displayRefillRequests())
            {
                newRefillRequestsListView.Items.Add(request.Status);
                newRefillRequestsListView.Items[i].SubItems.Add(request.Date);
                newRefillRequestsListView.Items[i].SubItems.Add(request.Prescription.PatientName);
                newRefillRequestsListView.Items[i].SubItems.Add(request.Prescription.PrescriberName);
                newRefillRequestsListView.Items[i].SubItems.Add(request.Prescription.Refills.ToString());
                newRefillRequestsListView.Items[i].SubItems.Add(request.Prescription.RemainingRefills.ToString());
                i++;
            }
        }