Multiply without a button

Question

SO I have three text boxes in my application, is it possible ot multply the numbers in the first two boxes in the third one without the user pressing a button?

IQ · Answer

Wow thanks, I didn't know Visual studio handled events.

Jon Bellamy · Answer

Hi, Yes you can do that under the textbox_LostFocus() event. Lets assume your textboxes are TextBox1, TextBox2, and TextBox3 with the value being displayed in TextBox3. Firstly set TextBox3.IsEnabled property to false and then add a new event to the TextBox2_LostFocus property and code as following. private void textBox2_LostFocus(object sender, RoutedEventArgs e) { multiplyValues(); } private void multiplyValues() { if (textbox1.Text != String.Empty && textBox2.Text != String.Empty) { try { textBox3.Text = (Convert.ToDouble(textBox1.Text) * Convert.ToDouble(textBox2.Text).ToString(); } catch (Exception) { MessageBox.Show("Both Values must be numeric","Error", MessageboxButton.OK, MessageBoxImage.Error); } } } By enclosing the code you could also place a call t the multipleValues() method in the lost focus event of TextBox1 if you wished to update the value everytime one of the values were changed - the above has very simple error capturing, but covers probably most of your needs. Hope that helps - Jon

Multiply without a button

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