Question

I had created a windows form.in that form there are 6 textbox’s, I need to add the values entered in that 5textbox’s and display in the 6th textbox in C#.net.

I’ve tried the following code:

txtbox6.Text = (Decimal.Parse(txtbox1.Text) + Decimal.Parse(txtbox2.Text)+
                (Decimal.Parse(txtbox3.Text)+(Decimal.Parse(txtbox4.Text)+   
                 (Decimal.Parse(txtbox5.Text)).ToString();

Answer 1

And what if the text in one of the textboxes isn’t a number? You could try something like this:

private Decimal GetNumberFromTextBox(TextBox txtbox)
{
    Decimal d;
    if (!Decimal.TryParse(txtbox.Text, out d))
    {
        throw new ArgumentException("Invalid number in " + txtbox.Name);
        // Instead you could return 0 here if that's what you want.
    }
    return d;
}

    textBox6.Text = Convert.ToString(
            GetNumberFromTextBox(textBox1) +
            GetNumberFromTextBox(textBox2) +
            GetNumberFromTextBox(textBox3) +
            GetNumberFromTextBox(textBox4) +
            GetNumberFromTextBox(textBox5)
        );