public void NumbuttonReceiver(string buttonName, string buttonTag)
{
if (buttonTag == "Perform")
{
converterManager.Perform();
}
if (buttonTag == "Operate")
{
converterManager.AddKey(" " + buttonName + " ");
}
if (buttonTag == "Delete")
{
converterManager.DelKey();
}
if (buttonTag == "Number")
{
converterManager.AddKey(buttonName);
}
BaseButtonReceiver(-1);
}