private void searchButton_Click(object sender, EventArgs e)
        {
            if (String.IsNullOrEmpty(imeiTextBox.Text))
            {
                MessageBox.Show("Please Enter IMEI");
                return;
            }
            if (imeiTextBox.TextLength != 15)
            {
                MessageBox.Show("IMEI must be 15 chat");
                return;
            }

            Mobile mobile = _mobileManager.GetByImei(imeiTextBox.Text);

            if (mobile != null)
            {
                modelNameLabel.Text = mobile.ModelName;
                imeiLable.Text      = mobile.IMEI;
                priceLabel.Text     = mobile.Price.ToString();
            }
            else
            {
                MessageBox.Show("No data found");
                return;
            }
        }