Populate List when web page load - asp.net

Question

I'm a newbie in ASP.NET and I'm stuck at populating a List when web page load.
I have a class that, when instantiated, will add some objects into a list. This class has a method to add objects to a list (I made this a method because I need to reuse it later). This is the code for this class:
public class Task()
{
private List<ObjectA> objList;
....// other variables and properties
public Task()
{
objList = new List<ObjectA>();
// first add 2 obj into the list
AddObjToList(objList);
AddObjToList(objList);
}
public void AddObjToList(List<ObjectA> objList)
{
bool exist = false;
ObjectA obj = new ObjectA(); // each obj has unique properties
foreach(var o in objList)
{
if(o.objName == obj.objName)
{
exist = true;
break;
}
}
if(!exist)
{
objList.add(obj);
}
}
}
I have a web page that, when loaded, I want it to populate the objList with 2 starting objects. This is my code behind for the web page:
protected void Page_Load(object sender, EventArgs e)
{
Task newTask = new Task();
// the following label control is to check the number of
// elements in the List
lblMSG.Text = newTask.getObjList.Count.ToString();
}
The problem is, when I run in debug mode, the list is populated with 2 objects just as I wanted. But when not in debug mode, when the page loaded, the label showed that the list has only 1 object. I tried to call the new Task() with isPostBack but the result is the same. What did I do wrong? What could I do to make it work?