Allowing only Decimal values in Text Box Csharp

You can handle this in keyPress event of Text Box as in following way....

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;

     }

}