Sending a List to Crystal Report

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CrystalReports

reporting

How can i send a list of special Objects to Crystal Report as source of data?!


sample class is here:

<br />
    public class User<br />
    {<br />
        int userID;<br />
        string userName;<br />
<br />
        public int UserID<br />
        {<br />
            get { return userID; }<br />
            set { userID = value; }<br />
        }<br />
<br />
        public string UserName<br />
        {<br />
            get { return userName; }<br />
            set { userName = value; }<br />
        }<br />
    }<br />

i want to make a list from class above and send it to crystal report

<br />
List<User> SampleList=new List<User>();<br />

how can i send SampleList to Crystal Report?! :doh:
I made many ways to doing this but none of them are usable for all deferent ways!!

do you know any right way?