C# - Return Selected Items From Checkboxlist Control?

I am trying to return in a string the selected items from a dynamically bound checkbox list control with no luck. In my code behind file I am conencting to a class called users and building a datatable. I then bind the data table to the cblist control

private void populateUserList() //called on page load
{
SubmitOptions mySubmission = new SubmitOptions(juris, rptType, tmplName);
if (mySubmission.Users.Count == 0)
{

[Code].....

The list populates fine and all I want to do is return in a string all selected users from the checkbox list control.

As I said if I hard code the item values into the control the above code works and I can see the selected items in the string however removing the itemslist tags and switching over to a binding nothign happens. The above method counts the entire number of returns but nothing selected is ever returned.