protected void searchButton_Click(object sender, EventArgs e)
{
string searchIMEI = inputIMEI.Value;
Mobile aMobile = new Mobile();
MobileManager mobileManager = new MobileManager();
aMobile = mobileManager.GetMobileByIMEI(searchIMEI);
modelNameLabel.Text = aMobile.ModelName;
imeiLabel.Text = aMobile.IMEI;
priceLabel.Text = aMobile.Price.ToString();
inputIMEI.Value = String.Empty;
}