Hyperlink conversion

Hi,

I have written this code for fetching Id from a list. That List contain one column URL which type is HyperLink or Picture. I have to compare that coulmn value to a string URL1.URL and URL1 contains same value.But Its not returning anything.Is there anythingwrong in Hyperlink conversion.

from SPListItem li in list1.Items.OfType<SPListItem>()
                                 where Convert.ToString(li["URL"]).ToUpper().Equals(URL1.ToUpper())
                                 select new
                                 {

                                   ID1 = li["ID"]
                                 };

Shubho