How to change the color of multiple textbox by looking at only one condition

Question

I’m creating an app on VS2015 Windowsformaplication where I need to change the colors of textbox where the result is greater than, equal to or less than zero(0). This is how I’m working:

if (Convert.ToDecimal(tbEntrDiferenca.Text) > 0)
  tbEntrDiferenca.BackColor = Color.Green;
if (Convert.ToDecimal(tbEntrDiferenca.Text) < 0)
  tbEntrDiferenca.BackColor = Color.Red;
tbEst2016Mat.BackColor = Color.Red;
if (Convert.ToDecimal(tbEntrDiferenca.Text) == 0)
  tbEntrDiferenca.BackColor = Color.Yellow;

I will need to make this same condition in twenty(20) textbox. There’s an easier way than that?

Answer 1

It is possible to catch all the textbox using this function:

foreach (Control c in Controls)
{
    TextBox tb = c as TextBox;
    if (tb != null)
    {
        //Sua Logica
    }
}

Just insert your logic into the block, it will change for everyone. Something like this would probably work:

 foreach (Control c in Controls)
    {
        TextBox tb = c as TextBox;
        if (tb != null)
        {
            if (Convert.ToDecimal(tb.Text) > 0)
                tb.BackColor = Color.Green;
            else if (Convert.ToDecimal(tb.Text) < 0)
                tb.BackColor = Color.Red;
            else 
                tb.BackColor = Color.Yellow;
        }
    }