Modal Popup selecting setting drop list on parent form

I have an asp.net form with a selection list on it that contains many items.  I want a modal popup to provide search criteria to narrow the selection, and once the selection is made, to set the ddlb on the parent form (and close the modal popup).  I am having trouble getting this to work.  When I choose the item in my modal popup, I call a method on the parent form to select the ddlb.  It doesn't work (the selection is made, but it doesn't persist).  I think I need to post back the form.  When I try and use the timer to generate a postback, the timer fires continuously, even after I disable it.

What would the proper way to code this be?
No1CoderAsked:
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Daniel Van Der WerkenIndependent ConsultantCommented:
You can't really have a child call a parent in ASP .NET. It works the other way around just fine. You need to persist value you're selected. Probably your best bet is to use a session variable. Do something like this:

Session["MyVariableName"] = value_selected_by_user_in_modal_box;

Then, when the modal dialog is closed, get the value such like:

string mySelectedValue = Session["MyVariableName"].ToString();

or

int mySelectedInt = int.MinValue;
int.TryParse(Session["MyVariableName"].ToString(), out mySelectedInt); // gets the integer value.
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No1CoderAuthor Commented:
Okay, but what event triggers the selection being set from the session variable?

Currently, when he hits OK on the popup, I locate the parent using something like:

parent = (ucParent)this.Parent.Parent.Parent;  

Then I call a method on parent to do some work:

parent.RefreshDropDown(valueselected)

The method gets called, and the DDLB value is selected, but it doesn't persist.  This technique I guess is not valid, but not sure why.  I have tried firing a timer event in the parent method, and setting the ddlb value on the timer event, but this has different issues.  The timer continuously fires, even after being disabled.

So, if instead I set a session variable when he hits OK, how do I trigger an event on the parent to refresh the DDLB?

Thanks for assisting.
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No1CoderAuthor Commented:
Additional Information

On my modal popup, the user clicks a selection link.  This causes the selection to be made, and the modal popup to close (manually, using Hide).  When debugging (with breakpoints set), this causes a postback on parent form.  When running without breakpoints, no parent postback occurs.  Somehow, I need to reliably notify the parent form that the modal popup has closed.  Is there a recommended way to do this?
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No1CoderAuthor Commented:
I resolved the issue.  In the popup window, i used jquery code to generate acpostback on parrent form by clicking a hidden button.
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No1CoderAuthor Commented:
Solution found
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