how can prevent rendering pages which cause removing the effeced(answered) items?

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SQL-Server

SQL-Server-2008

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Hello.

I have made an application (sruvey) by Asp.net 4 and sqlserver 2008 which users select an item (Radio button) and submit their response which will be inserted into the database.

i would like to make a button in each page that when user wanted to modify his answers be able to return to previous page and Update them.

so i have put a button in one page which redirect the page toward previous page , but all of my answers in radio button are removed totoally and there is no trce of my responses

inside the page. the code is for button is below:

Response.Redirect("GeneralCourse.aspx"); //this is the .net code which redirect page to back page

<form id="fro"  runat="server">
              <asp:ImageButton ID="ImageButton1" runat="server" Height="43px"
             ImageUrl="~/Images/ForwardArrow.png" ToolTip="ثبت و ادامه سوالات نظرسنجی" 
             Width="150px" BorderColor="#1E6D8E" BorderStyle="Double" 
             BorderWidth="1px" onclick="ImageButton1_Click1"  />
     </form> 

so what i shall i do ?

thank you so much..