private void EqualClick(object sender, RoutedEventArgs e)
 {
     BtnEqual.IsEnabled = false;
     BtnPoint.IsEnabled = true;
     BtnC.IsEnabled     = true;
     BtnCE.IsEnabled    = false;
     TxtDisplay.Text    = operations.EqualOperation(TxtDisplay.Text);
     if (TxtDisplay.Text == "Cannot divide by zero!")
     {
         EnableDisableButtons(false);
         NumericalButtons(false);
         BtnEqual.IsEnabled           = false;
         BtnPoint.IsEnabled           = false;
         BtnCE.IsEnabled              = false;
         BtnMemoryAdd.IsEnabled       = false;
         BtnMemorySubstract.IsEnabled = false;
         BtnMemoryStore.IsEnabled     = false;
     }
     else
     {
         FormatTextForOperations();
     }
 }