using System.Text.RegularExpressions;
public static class Validate
{
public static bool IsIpAddress(string value)
{
if (string.IsNullOrEmpty(value))
return false;
Regex ipAddress = new Regex(@"^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
return ipAddress.IsMatch(value);
}
}