Test passed values to see if they are numeric or not using the TryParse method on the Double data type.

1. public static bool IsNumeric(string NumToValidate)
2. {
3.  if (HasValue(NumToValidate))
4.  {
5.  double NumTest = new double();
6.  System.Globalization.CultureInfo cultureInfo = new System.Globalization.CultureInfo("en-US", true);
8.  return Double.TryParse(NumToValidate, System.Globalization.NumberStyles.Any, cultureInfo.NumberFormat, out NumTest);
9.  }
10.  else
11.  {
12.  return false;
13.  }
14. }