C#

StringReader sr = new StringReader(stringToPrint);
....

Do While strReader.Peek() >= 0
    Console.WriteLine(strReader.ReadLine())
Loop

private void tb_KeyPress(object sender, KeyPressEventArgs e)
{
    string regexstring = @"(\d+)|(\d*\.\d{1,2})";

    //Regex reg = new Regex("^[0-9]+.[0-9]*");
    Regex reg = new Regex(regexstring);
    //Regex reg = new Regex("(\d+)|(\d*\.\d{1,2})");
    //Regex reg = new Regex("^[A-Za-z]+\\w*");
    if (reg.IsMatch(Convert.ToString(e.KeyChar)))
    {
        e.Handled = false;
    }
    else
    {
            e.Handled = true;
    }
}