call server side function of parent page in asp.net

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ASP.NET

jQuery

Hi
I open a pop up page(child page) by using jquery(jquery.colorbox.js) in asp.net application. Now when I click on search button I want to close the pop up page(child page) and refresh the UpdatePanel1 by using search parameters.
for above I need to execute server side function in parent page.

So please can any one help me how can I call server side function while closing pop up page and I should be able to get search parameter values in server side function.

Code to close pop up:

child.aspx:

<script>
     function closePopup() {
         parent.$.fn.colorbox.close();
         return true;
     }
</script>

child.aspx.cs:

protected void Page_Load(object sender, EventArgs e)
        {
            btnSearch.Attributes.Add("onClick", "return closePopup();");
        }
        protected void btnSearch_Click(object sender, EventArgs e)
        {
        }