VS 2005 - Sending A List To Web Service

I have an object that contains a list of Email addresses and EmailIDs.

Code:
public class DataObjects
{
public class UserEmails
{
private string _Email;
public string Email

[Code] ....

And I populate it like this:

Code:
protected void GetEmails()
{
DataAccess da = new DataAccess(); //this is a separate Data Access class with loads of methods to access the database
List<DataObjects.UserEmails> myUserEmailsList = new List<DataObjects.UserEmails>(); //create a list of UserEmails objects
myUserEmailsList = da.getUserEmails(1); //this passes in a UserID to the data access function that returns me a list of emails for this user
myPassedList(myUserEmailsList); //I pass the list to another function just to prove the data is there and can be retrieved.
}

The last line in GetEmails passes the list to myPassedList

Code:
protected void myPassedList(IList EmailsList)
{
foreach (DataObjects.UserEmails myUserEmails in EmailsList) //loop through the list to prove it is populated etc.
{
int EmailID = myUserEmails.EmailID;
string Email = myUserEmails.Email;
}
}

Everything above works fine. Here's the question. When I am at the point where I have populated the List of UserEmails - I need to pass it to a web service for someone else to access the data.

I pass my list to a function and I can loop through it by writing:

foreach (DataObjects.UserEmails myUserEmails in EmailsList)

which is fine, for me, because my application knows what DataObjects.UserEmails means ... the people receiving the list won't. They are just getting a list.

Can they loop through the list I pass them without knowing the structure of the object in the list and just extract the data?