Postback url problem

hi, i have this code and this code not working properly
code in one.aspx

<asp:HiddenField runat="server" ID="hfDistrict" Value='<%# Eval("District")%>' />
<asp:HiddenField runat="server" ID="hfDistCode" Value='<%# Eval("DistCode") %>' />
<asp:LinkButton runat="server" ID="btn_NoOfA"  PostBackUrl="~/AcData.aspx" Text='<%# Eval("NoOfCount") %>' />

Code in AcData.aspx

string k = ((HiddenField)PreviousPage.FindControl("hfDistrict")).Value;

also try this code

string DistrictN1 = Request.Form["hfDistrict"]

but i did not get value from previous page
actually we need to remove querystring from old code and not want to use session and we are try to use postbackurl to pass value from one.aspx to AcData.aspx.
what is the exact problem i was doing and what will be the solution. plz provide solution thanks and regrds

What I have tried:

code in one.aspx

<pre><asp:HiddenField runat="server" ID="hfDistrict" Value='<%# Eval("District")%>' />
<asp:HiddenField runat="server" ID="hfDistCode" Value='<%# Eval("DistCode") %>' />
<asp:LinkButton runat="server" ID="btn_NoOfA"  PostBackUrl="~/AcData.aspx" Text='<%# Eval("NoOfCount") %>' />

Code in AcData.aspx

string k = ((HiddenField)PreviousPage.FindControl("hfDistrict")).Value;

also try this code

string DistrictN1 = Request.Form["hfDistrict"]

Tags: C#, ASP.NET