kontrolliert ob String eine gültige GUID ist

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/// <summary>
/// Determines whether the specified candidate is a valid GUID.
/// </summary>
/// <param name="candidate">The candidate.</param>
/// <returns>
/// 	<c>true</c> if the specified candidate is GUID; otherwise, <c>false</c>.
/// </returns>
public static bool IsValidGuid(string candidate)
{
    if (string.IsNullOrEmpty(candidate))
        return false;

    Regex isGuid = new Regex(@"^(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}$");
    return isGuid.IsMatch(candidate);
}