LinkButtons not working on .aspx page when i add crystalreportviewer to page

HTML code

<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" CodeBehind="liststudent.aspx.cs" Inherits="PublicSchoolMgt.admin.liststudent" %>

<%@ Register Assembly="CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" Namespace="CrystalDecisions.Web" TagPrefix="CR" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="AdminHome" runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Frits High - School Management Software</title>

<script type="text/javascript" src="../js1/jquery.tools.min.js"></script>
<script type="text/javascript" src="../js1/jquery.cookie.js"></script>
<script type="text/javascript" src="../js1/jquery.ui.min.js"></script>
<script type="text/javascript" src="../js1/jquery.tables.js"></script>
<script type="text/javascript" src="../js1/jquery.flot.js"></script>

</head>
<body>
<form id="Form1" class="form" runat ="server">
<div id="wrapper">
<header>
<div class="clearfix">
<nav>
<div class="avatar"><a href="home.aspx">
<img src="../images/logo.png" alt="Logo" /></a></div>
<div class = "clearfix">
<asp:Label ID="Label2" runat="server" Text="" ForeColor="Green"></asp:Label>
</div>
<ul class="clearfix">
<li>
<asp:LinkButton ID="lnkSess" CssClass="arrow-down" Enabled="false" runat="server">New Session</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkPromo" runat="server" PostBackUrl="promoclass.aspx">Student Promotion</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkNewSess" runat="server" PostBackUrl="~/admin/session.aspx" >Create New Session</asp:LinkButton></li>
</ul>
</li>
<li>
<asp:LinkButton ID="lnkStaff" CssClass="arrow-down" Enabled="false" runat="server">Staff</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkTeachDetail" runat="server" PostBackUrl="teacherdetail.aspx">Add Staff/Teacher</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkAssSub" runat="server" PostBackUrl="assign.aspx">Assign Subject</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkTeachDelete" runat="server" PostBackUrl="teacherdelete.aspx">Manage Staff/Teacher</asp:LinkButton></li>
</ul>
</li>
<li>
<asp:LinkButton ID="lnkStudent" CssClass="arrow-down" Enabled="false" runat="server">Student</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkMassStudReg" runat="server" PostBackUrl="studentreg.aspx">Student Reg.(Mass)</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkStudReg" runat="server" PostBackUrl="studentdetail.aspx">Student Registration</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkStudList" runat="server" PostBackUrl="studlist.aspx">View Student List</asp:LinkButton></li>
</ul>
</li>
<li>
<asp:LinkButton ID="lnkResult" CssClass="arrow-down" Enabled="false" runat="server">Result & C.A.</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkBroadSheet" runat="server" PostBackUrl="broadsheet.aspx">Print Broadsheet</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkReport" runat="server" PostBackUrl="reportcard.aspx">Result Statement</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkPerformance" runat="server" PostBackUrl="~/admin/performance.aspx">Performance List</asp:LinkButton></li>
</ul>
</li>
<li>
<asp:LinkButton ID="lnkWeb" CssClass="arrow-down" Enabled="false" runat="server">Web Content</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkSlider" runat="server" PostBackUrl="slider.aspx">Web Slider</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkAdvert" runat="server" PostBackUrl="advertisements.aspx">Advert</asp:LinkButton></li>
</ul>
</li>
<li>
<asp:LinkButton ID="lnkUtil" CssClass="arrow-down" Enabled="false" runat="server">Utilities</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkAdmission" runat="server" PostBackUrl="admission.aspx">Admission List</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkTTable" runat="server" PostBackUrl="classtimetable.aspx">Time Table</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkGallery" runat="server" PostBackUrl="gallery.aspx">Gallery</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkMail" runat="server" PostBackUrl="sendmail.aspx">Messaging</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkSMS" runat="server" PostBackUrl="bulksms.aspx">Bulk SMS</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkTopGrad" runat="server" PostBackUrl="graduant.aspx">Top Graduants</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkNews" runat="server" PostBackUrl="news.aspx">News</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkEvents" runat="server" PostBackUrl="events.aspx">Events</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkVacancy" runat="server" PostBackUrl="vacancy.aspx">Vacancy</asp:LinkButton></li>
</ul>
</li>
<li><asp:LinkButton ID="lnkAdmin" CssClass="arrow-down" Enabled="false" runat="server">Administrator</asp:LinkButton>
<ul>
<li><asp:LinkButton ID="lnkAcct" runat="server" PostBackUrl="account.aspx">New Account</asp:LinkButton></li>
<li><asp:LinkButton ID="lnkManAccts" PostBackUrl="~/admin/manaccounts.aspx" runat="server" >Manage Accounts</asp:LinkButton></li>
</ul>
</li>
<li class="fr active"><a class="arrow-down">My Account</a>
<ul>
<li><a href="accountedit.aspx">Edit Account</a></li>
<li><a href="resetpassword.aspx" class="arrow-down">Change Password</a></li>
<li><a href="logout.aspx">Sign out</a></li>
</ul>
</li>
</ul>
</nav>
</div>
</header>

<section>
<div class="container_8 clearfix">

<section class="main-section grid_8">

<div class="main-content">
<header><h2></h2></header>
<header><h2></h2></header>
<section class="container_6 clearfix">
<div class="fr action">
<a href="documentation/index.html" class="button button-orange help" rel="#overlay"><span class="help"></span>Help</a>
</div>
<div class="grid_4 clearfix">
<header class="clearfix">

<header>
<h3>
Students List - <asp:Label ID="Label3" runat="server" Text=""></asp:Label>
</h3>
</header>
<div class = "clearfix">
<asp:Label ID="Label1" runat="server" Text="" ForeColor="Red"></asp:Label>
</div>
<div class="clearfix">
<asp:Button ID="btnPrint" runat="server" Width="120px"
CssClass="button button-round" Text="Print List" onclick="btnPrint_Click"></asp:Button>
</div>
<div class="clearfix">
<asp:GridView ID="GridView1" AutoGenerateColumns="False" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating"
CssClass="datatable selectable full" runat="server" onpageindexchanging="GridView1_PageIndexChanging" PageSize="10">
<PagerSettings Mode="NextPreviousFirstLast" />
<Columns>
<asp:TemplateField HeaderText="Student ID.">
<ItemTemplate>
<asp:Label runat="server" ID="StudentID" Text='<%#Eval("StudentID")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Last Name">
<ItemTemplate>
<asp:Label runat="server" ID="Lname" Text='<%#Eval("Lname")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label runat="server" ID="Fname" Text='<%#Eval("Fname")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Middle Name">
<ItemTemplate>
<asp:Label runat="server" ID="Mname" Text='<%#Eval("Mname")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Sex">
<ItemTemplate>
<asp:Label runat="server" ID="Sex" Text='<%#Eval("Sex")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date of Birth">
<ItemTemplate>
<asp:Label runat="server" ID="DOB" Text='<%#Eval("DOB")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Change Class">
<ItemTemplate>
<asp:Button ID="btnEdit" runat="server" Width="100px" Text="Change Class" CommandName="Edit"></asp:Button>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit">
<ItemTemplate>
<asp:Button ID="btnUpdate" runat="server" Width="100px" Text="Edit Profile" CommandName="Update"></asp:Button>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</section>
</div>
</section>
</div>

</section>

</div>
</section>
</div>
<CR:CrystalReportViewer ID="CrystalReportViewer1" runat="server" AutoDataBind="true" />
<footer>
<div id="footer-inner" class="container_8 clearfix">
<div class="grid_8">
</div>
</div>
</footer>

</body>
</html>

Code behind

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
if (Session["AdminID"] == null)
{
Response.Redirect(@"/admin/logout.aspx");
}

if (User.IsInRole("admin"))
{
lnkNewSess.Enabled = false;
lnkPromo.Enabled = false;
lnkTeachDetail.Enabled = false;
lnkTeachDelete.Enabled = false;
lnkSMS.Enabled = false;
lnkAcct.Enabled = false;
lnkManAccts.Enabled = false;
}
else if (User.IsInRole("administrator"))
{
lnkNewSess.Enabled = true;
lnkPromo.Enabled = true;
lnkTeachDetail.Enabled = true;
lnkTeachDelete.Enabled = true;
lnkSMS.Enabled = true;
lnkAcct.Enabled = true;
lnkManAccts.Enabled = true;
lnkAssSub.Enabled = true;
}
else
{
Response.Redirect(@"/admin/logout.aspx");
}
}
getName();
gridbind();
getclassname();
Response.Cache.SetNoStore();
}

private void getName()
{
int AdminID = int.Parse(Session["AdminID"].ToString());
string Username = getUsername(AdminID);
Label2.Text = "Welcome, " + Username + "!";
}

public static string getUsername(int AdminID)
{
PublicSchoolMgt.admin.liststudent list = new liststudent();
using (SqlConnection con = new SqlConnection(list.CS))
{
string msg;
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("sp_Admin", con);
da.SelectCommand.CommandType = CommandType.StoredProcedure;
da.SelectCommand.Parameters.AddWithValue("@Admin_Id", AdminID);
da.SelectCommand.Parameters.AddWithValue("@Type", "s");
da.Fill(ds);
con.Open();
if (ds.Tables[0].Rows.Count > 0)
{
msg = ds.Tables[0].Rows[0]["Fullname"].ToString();
}
else
{
msg = null;
}
return msg;
}
}

public static int getSession()
{
PublicSchoolMgt.admin.liststudent list = new liststudent();
using (SqlConnection con = new SqlConnection(list.CS))
{
int code;
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("sp_Session", con);
da.SelectCommand.CommandType = CommandType.StoredProcedure;
da.SelectCommand.Parameters.AddWithValue("@Type", "b");
da.Fill(ds);
con.Open();
if (ds.Tables[0].Rows.Count > 0)
{
code = int.Parse(ds.Tables[0].Rows[0]["SessID"].ToString());
}
else
{
code = 0;
}
return code;
}
}

public static DataSet getStudent(int ClassID, int SessID)
{
PublicSchoolMgt.admin.liststudent list = new liststudent();
using (SqlConnection con = new SqlConnection(list.CS))
{
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("sp_StudentDetail", con);
da.SelectCommand.CommandType = CommandType.StoredProcedure;
da.SelectCommand.Parameters.AddWithValue("ClassID", ClassID);
da.SelectCommand.Parameters.AddWithValue("SessID", SessID);
da.SelectCommand.Parameters.AddWithValue("@Type", "k");

da.Fill(ds);
con.Open();

try
{
return ds;
}
catch
{
throw;
}
finally
{
con.Close();
}
}
}

public static string getclasslink(int ClassID)
{
PublicSchoolMgt.admin.liststudent list = new liststudent();
using (SqlConnection con = new SqlConnection(list.CS))
{
string msg;
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("sp_Class", con);
da.SelectCommand.CommandType = CommandType.StoredProcedure;
da.SelectCommand.Parameters.AddWithValue("@ClassID", ClassID);
da.SelectCommand.Parameters.AddWithValue("@Type", "j");
da.Fill(ds);
con.Open();
if (ds.Tables[0].Rows.Count > 0)
{
msg = ds.Tables[0].Rows[0]["Classlink"].ToString();
}
else
{
msg = "";
}
return msg;
}
}

private void getclassname()
{
int classid = int.Parse(Session["ClassID"].ToString());
string classlink = getclasslink(classid);
Label3.Text = classlink;
}

public void gridbind()
{
int ClassID = int.Parse(Session["ClassID"].ToString());
int SessID = getSession();
DataSet ds = getStudent(ClassID, SessID);
if (ds.Tables[0].Rows.Count > 0)
{
GridView1.DataSource = ds.Tables[0].DefaultView;
GridView1.DataBind();
}
else
{
Label1.Text = "No students records found!";
}
}

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
gridbind();
}

protected void btnPrint_Click(object sender, EventArgs e)
{
int SessID = getSession();
Session["SessID"] = SessID;

int ClassID = int.Parse(Session["ClassID"].ToString());
Session["ClassID"] = ClassID;

DataSet ds = new DataSet();
ds = getStudent(ClassID, SessID);
//SchoolMgt.print.studlist stdlist = new SchoolMgt.print.studlist();
if (ds.Tables[0].Rows.Count > 0)
{
// Once I have the data I need to apply it to the connection of the report
//code to request connection using connectionString in web.config
PublicSchoolMgt.admin.liststudent list = new liststudent();
SqlConnectionStringBuilder sqlconn = new SqlConnectionStringBuilder(list.CS);

ConnectionInfo crConnection = new ConnectionInfo();
crConnection.UserID = sqlconn.UserID;
crConnection.ServerName = sqlconn.DataSource;
crConnection.DatabaseName = sqlconn.InitialCatalog;
crConnection.Password = sqlconn.Password;

ReportDocument stdlist = new ReportDocument();
stdlist.Load(Server.MapPath("~/print/studlist.rpt")); // path of report

Tables rptTables = stdlist.Database.Tables;
for (int i = 0; i < rptTables.Count; i++)
{
CrystalDecisions.CrystalReports.Engine.Table tblRpt = rptTables[i];
TableLogOnInfo tblInfo = tblRpt.LogOnInfo;
tblInfo.ConnectionInfo = crConnection;
tblRpt.ApplyLogOnInfo(tblInfo);
}
stdlist.SetParameterValue("paraSessID", int.Parse(Session["SessID"].ToString()));
stdlist.SetParameterValue("paraClassID", int.Parse(Session["ClassID"].ToString()));

CrystalReportViewer1.ReportSource = stdlist;
Session["SessID"] = null;
Session["ClassID"] = null;

stdlist.ExportToHttpResponse(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat, Response, true, "First Term Broadsheeet");
//here i have used [ CrystalDecisions.Shared.ExportFormatType.PortableDocFormat ] to Export in PDF
}
else
{
Label1.Text = "No student records found!";
}
}

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
Label ID = GridView1.Rows[e.NewEditIndex].FindControl("StudentID") as Label;
int StudentID = int.Parse(ID.Text);

Session["StudentID"] = StudentID;

Response.Redirect(@"newstudentclass.aspx");
}

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
Label ID = GridView1.Rows[e.RowIndex].FindControl("StudentID") as Label;
int StudentID = int.Parse(ID.Text);

Session["StudentID"] = StudentID;
Response.Redirect(@"studentedit.aspx");
}