Question

I want to check that a textbox doesnt have more than one decimal point (in gridview) without using validation or javascript,

I want check this on textchanged…

I have kept validation, filter ajax extender and all that but I wnat it here

  protected void txtqty_TextChanged(object sender, EventArgs e)
        {
}

Answer 1

Here ya go…

using System.Text.RegularExpressions;

protected void txtqty_TextChanged(object sender, EventArgs e)
{

  decimal number;
  string value = txtqty.Text;

  if (decimal.TryParse(value, out number))
  {
    Regex rx = new Regex(@"[0-9]*\.?[0-9]*");

    if (!rx.IsMatch(value))
    {
      Response.Write("error");
    }
    Response.Write("good");
  }
  else
  {
    Response.Write("error");
  }

}