Add List box to List<ListBox> to pass to foreach loop ASP.NET

Hi I'm trying to create a list of ListBox's in ASP.NET so that I can then iterate it to test if it has been selected.

    List<string> con = new List<string>();
    List<ListBox> lb = new List<ListBox>();
    foreach (Control c in _pH_Outer_MainCri.Controls)
    {
        if (c is ListBox)
        {
            con.Add(c.ID.ToString());
            lb.Add(c.??);
        }
    }

I'm getting caught up on that last part. Basically then I can

foreach(ListBox a in lb)
    {
        if(a.TestSelection() == true )
        {
            BuildQue开发者_StackOverflow中文版ry(a);
        }
    }

Thanks in advance for the help ...

If you are adding all listboxes then you would want

lb.Add((ListBox)c);

You can avoid placing the controls in a list by using LINQ, like this:

var listboxen =
    from control in _pH_Outer_MainCri.Controls
    where control is ListBox
    select control as ListBox;

You can then foreach through the list boxes without having to build an intermediate collection.

When I get overwhelmed, I often find it helpful to take a step back and think about my structures:

List<ListBox> lb - This is a list and each member in the list is of a type ListBox.

In your loop, you want to pull out all of the listboxes, so when you have: if (c is ListBox) { you know that c is already of the type listbox, which is the same type lb is storing. It is simply a matter of adding c to your collection in lb with lb.Add(c);

Separately - do you really need to store these items only to loop through them again and call BuildQuery? Looping through, putting them in a list, and then looping through that collection again may be extra overhead depending on what you are doing.