private void Btn_UploadFile_Click(object sender, RoutedEventArgs e)
        {
            if (dialog != null && File.Exists(dialog.FileName))
            {
                //Delete file if already exists
                policyManager.DeleteFile(policyId);

                byte[] fileBytes = File.ReadAllBytes(dialog.FileName);
                bool   status    = policyManager.AddFile(fileBytes, dialog.SafeFileName, policyId);
                if (status)
                {
                    dialog             = null;
                    txt_SelectBox.Text = "";
                    MessageBox.Show("File uploaded successfully.");
                    this.Close();
                }
                else
                {
                    dialog             = null;
                    txt_SelectBox.Text = "";
                    MessageBox.Show("Can't upload file now. Please try again later.");
                    this.Close();
                }
                return;
            }

            MessageBox.Show("Please select a file to upload.");
            return;
        }