c# - Only allow two digits after decimal in textbox?

Question

I have a textbox where the user enters a number, but how can i make it so that if they type the '.' after it it only allows 2 decimal places?

private void textBox1_KeyPress(object sender, KeyPressEventArgs e) 
{ 
    if (!char.IsControl(e.KeyChar)  
        && !char.IsDigit(e.KeyChar)  
        && e.KeyChar != '.') 
    { 
        e.Handled = true; 
    } 

    // only allow one decimal point 
    if (e.KeyChar == '.'  
        && (sender as TextBox).Text.IndexOf('.') > -1) 
    { 
        e.Handled = true; 
    } 
}

Answer 1

Just add:

if (Regex.IsMatch(textBox1.Text, @".dd")) {
   e.Handled = true;
}

to the end of your function