Simple validation for parameter types

Are-Params-Valid.cs

private static bool AreParamsValid(object[] parameters)
{
    if (parameters == null || parameters.Length == 0)
        return false;

    var result = true;

    parameters.ForEach(p =>
    {        
        if (p is string)
        {
            if (string.IsNullOrEmpty(p as string))
                result = false;
        }

        else if (p is DateTime)
        {
            var dateTime = (DateTime)p;
            if (dateTime.equals(DateTime.Min))
                result = false;
        }
    });

    return result;
}