C# optional properties in C# 3.0 (2009)

I am wondering if C# supports optional properties as the following

public class Person
{
    public string Name { get; set;}
    public optional string NickName { get; set;}
    ...many more properties...
}

so that when I create a Person object I can easily check the validity of input values in a simple loop

public bool IsInputOK(Person person)
{
    foreach( var property in person.GetType().GetProperties())
    {
        if( property.IsOptional())
        {
             continue;
        }
        if(string.IsNullOrEmpty((string)property.GetValue(person,null)))
        {
             return false;
        }
    }
    return true;
 }

I have searched on google but didn't get desired solution. Do I really have to hand code validation code for each property manually?

Thanks.