user control with aspx pages in sharepoint site

I have created one usercontrol to deploy as a webpart.Iam developing one simple application with sharepoint site.In the usercontrol  iam placing 3 text boxes and 3 bottons.(Imagine that County,State list,City)in a button click event i have to retrive data from Sqlserver DB and showing in Lookup window by catching in gridview whic has more than 200 records of patients details.this process applicable for 3 buttons.. So here i have taken user control as a parent and all 3 (Coutry,state,Name)  child as a ASPX pages.iam unble to retrieve the aspx pages in a site when i cilck the button. I tried to give the path in Layout folder ..but no go..i tried with different folder still no go...pls guide me how to call aspx page in usercontrol to deploy as a webpart or any other ways to do with this issue.. please check the one.jpeg image which shows  of solution explorer structrure. and in second  image by clicking button how it will display the lookup window. in third image is usercontrol page..
pls give me the suitable answers and solutions..
one.jpg
two.jpg
usercontrol.jpg