Issue with Accordian while postback

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C#

ASP.NET

I have accordian pan menu which is loading from XML menu.

When I press any link in menu, it is opening respective page. When I enter data in some text boxes and then press same link in menu the page ispostback is not working. The entered data remains same.

How to clear enter data i.e I need to open a new form, but it is opening same form with data.

string _user_role;


        protected void Page_Load(object sender, EventArgs e)
        {
            int rowid = -1;

            //if (!IsPostBack)
            //{
            #region Code for Menu
            DataSet ds = new DataSet();
            DataTable dt1 = new DataTable();
            try
            {

                //By Dileep [5Jan11] - to add Session of UserRole
                //dt1 = DALAuthentication.GetUserRoleName(Session["UserID"].ToString());
                //_user_role = dt1.Rows[0][0].ToString();
                if (Session["RoleName"] == null)
                {
                    Session.Abandon();
                    Response.Redirect("login.aspx");
                }
            
                else
                {
                    _user_role = Session["RoleName"].ToString();
                    ds.ReadXml(Server.MapPath("~/XmlData/" + _user_role + ".xml"));
                }
                //End Dileep
            }
            catch
            {
                if (Session["RoleName"] == null)
                {

                    Session.Abandon();
                    Response.Redirect("login.aspx");
                }
                else
                {
                    Response.Write("<script language='javascript'>alert('User:" + Session["UserID"].ToString() + " Role not exists');</script>");
                    return;
                }
            }
            DataRow[] found2ndDBRows;
            DataRow[] found2ndDBRows1;
            DataRow[] found2ndDBRows2;
            string strDBExpr1;
            foreach (DataRow drRow in ds.Tables[0].Rows)
            {
                if (drRow["value"].ToString() == "Operations")
                // if (drRow["value"].ToString() != "")
                {
                    string strDBExpr = "value = '" + "Operations" + "'";
                    found2ndDBRows = ds.Tables[0].Select(strDBExpr, string.Empty);
                    foreach (DataRow str in found2ndDBRows)
                    {
                        if (rowid != Convert.ToInt32(str[0].ToString()))
                        {
                            strDBExpr1 = "type_id = " + str[0].ToString() + "";
                            rowid = Convert.ToInt32(str[0].ToString());
                            found2ndDBRows1 = ds.Tables[1].Select(strDBExpr1, string.Empty);

                            foreach (DataRow str3 in found2ndDBRows1)
                            {
                                string strDBExpr2 = "ActionType_id = " + str3[0].ToString() + "";
                                found2ndDBRows2 = ds.Tables[2].Select(strDBExpr2, string.Empty);
                                AjaxControlToolkit.AccordionPane pane = new AjaxControlToolkit.AccordionPane();
                                pane.ID = strDBExpr2;
                                PaneHTMLTemplate header = new PaneHTMLTemplate(" <div  >" + " <a href=''  önclick='return false;' >" + str3[1].ToString() + "" + "</a></div>");

                                pane.Header = header;



                                foreach (DataRow str1 in found2ndDBRows2)
                                {
                                    LinkButton lb = new LinkButton();
                                    lb.Text = str1[0].ToString();
                                    lb.ID = str1[0].ToString() + "-link";
                                    lb.PostBackUrl = str1[1].ToString();
                                    lb.CommandArgument = str1[0].ToString();
                                    lb.Click += new EventHandler(lb_Click);
                                    lb.CssClass = "accordionContent";
                                    pane.ContentContainer.Controls.Add(lb);
                                    Panel innerpan = new Panel();
                                    innerpan.ID = str1[0] + "_pan";
                                    innerpan.Controls.Add(lb);