Add textbox values when leaving the field

Question

I have a form with three TextBoxes where the user will enter any value and a Label where I want to show the result of the sum of these values.

However, I would like to add up the contents of these TextBoxes without having to click a button. I mean, as long as I’m filling in the TextBoxes, the values are being added up and the sum is shown in the Label.

Answer 1

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void fazOqVcQuer()
    {
        try
        {
            label1.Text =
            (Convert.ToDecimal(textBox1.Text)
            +
            Convert.ToDecimal(textBox2.Text)
            +
            Convert.ToDecimal(textBox3.Text)).ToString();
        }
        catch (Exception)
        {
        }  
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        fazOqVcQuer();
    }

    private void textBox2_TextChanged(object sender, EventArgs e)
    {
        fazOqVcQuer();
    }

    private void textBox3_TextChanged(object sender, EventArgs e)
    {
        fazOqVcQuer();
    }
}

Hello friend. There are several ways to do this. Since you are starting, understand this code "well" simple. replace the values "textBox1", "textBox2" and "textBox3" by their name, etc