Null Value

Hi

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.IO;
using System.Data;
using Indivar;
using System.Configuration;

public partial class ProjectPlanner_CreateProjectNotes : BasePage
{
    clsManageNotes obj;
    string fn , v_fileattached,v_fileguid;
    int vproject_Id = 1;
    int vcreatedby = 1;

    protected void Page_Load(object sender, EventArgs e)
    {
        trhreflink.Visible = false;
        if (!Page.IsPostBack)
        {
            //=============To show the active tab on postback
            tabContainerProjects.ActiveTabIndex = Convert.ToInt32(hfCurrentTab.Value);

 
            bindProjects();
         }
    }

    //public void Downloadfile()
    protected void btnMethodOne_Click(object sender, EventArgs e)
    {
 
           Response.AppendHeader("content-disposition", "attachment; filename=" + v_fileguid);
             Response.TransmitFile(Server.MapPath("~/Documents/" + v_fileguid));
             Response.End();

     }

    //======= Save Project Notes ========
    protected void btnSaveProject_Click(object sender, EventArgs e)
    {
        int errStatus = validateInputFields();
        if (errStatus == 0)
        {
            obj = new clsManageNotes();
            obj.projNote_ProjectId = vproject_Id;
            obj.projNote_Title = txtProjectNoteTitle.Text;
            obj.projNote_Note = txtProjectNoteDescription.Text;
            obj.projNote_FileAttached = fuUploadFile.PostedFile.FileName;
            obj.projNote_CreatedBy = vcreatedby;

            fn = Guid.NewGuid().ToString() + fuUploadFile.FileName.Substring(fuUploadFile.FileName.LastIndexOf("."));
            obj.projNote_FileId = fn;
            UploadDocument();               
            int status = clsManageNoteMethods.addProject(obj);
            if (status == 0)//=======If query Successfully Executed
            {
 
               clearInputFields();

                //========== Bind Data
                bindProjects();
            }
        }
    }

    //======= Update Project ========
    protected void btnUpdateProject_Click(object sender, EventArgs e)
    {
        int errStatus = validateInputFields();
        if (errStatus == 0)
        {
            obj = new clsManageNotes();
            obj.projNote_Title = txtProjectNoteTitle.Text;
            obj.projNote_Note = txtProjectNoteDescription.Text;
            obj.projNote_CreatedBy = 1;

            obj.projNote_Id = Convert.ToInt32(hfSelectedRecord.Value);

            UploadDocument();
            int status = clsManageNoteMethods.updateProject(obj);

            if (status == 0)//=======If query Successfully Executed
            {
 
               clearInputFields();

                //========== Bind Data
                bindProjects();
            }
        }
    }

    //======= Cancel Project ========
    protected void btnCancelProject_Click(object sender, EventArgs e)
    {
        clearInputFields();
        btnSaveProject.Visible = true;
        btnUpdateProject.Visible = false;
    }

    //============= Repeater Command Events =====================
    protected void repProjects_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        lblInfoMessage.Text = string.Empty;
        divMessage.Style.Add("display", "none");
        if (e.CommandName == "Edit")
        {
            hfCurrentTab.Value = (0).ToString();//======= To show the add tabcontainer on postback
            hfSelectedRecord.Value = e.CommandArgument.ToString();

            bindProjectRecordsToEdit(Convert.ToInt32(e.CommandArgument));
            tabContainerProjects.ActiveTabIndex = 0;
            btnSaveProject.Visible = false;
            btnUpdateProject.Visible = true;

         }
        else if (e.CommandName == "View")//====== To show the complete details of the project.
        {
            repProjectDetails.DataSource = clsManageNoteMethods.getProjectNoteDetail(Convert.ToInt32(e.CommandArgument));
            repProjectDetails.DataBind();
            mpeProjectDetails.Show();
        }
    }

    #region Methods
    //=-=-=-= To Clear Input fields of project form =-=-=-=
    public void clearInputFields()
    {
        txtProjectNoteTitle.Text = string.Empty;
        txtProjectNoteDescription.Text = string.Empty;
    }

    //=== Validate Fields=====
    public int validateInputFields()
    {
        int errCnt = 0;
        string errMsg = "";
        if (txtProjectNoteTitle.Text == string.Empty)
        {
            errMsg += "

Please enter discussion title.

";
            errCnt++;
        }
        if (txtProjectNoteDescription.Text == string.Empty)
        {
            errMsg += "

Please enter message description.

";
            errCnt++;
        }
        return errCnt;
    }

    //====== To bind data ==========
    public void bindProjects()
    {
        repProjects.DataSource = clsManageNoteMethods.getProjectNoteToDisplay(vproject_Id);
        repProjects.DataBind();
    }

    //======= To bind values to the fields to edit a record
    public void bindProjectRecordsToEdit(int projNote_Id)
    {
        obj = new clsManageNotes();
        SqlDataReader dr = clsManageNoteMethods.getProjectToEdit(projNote_Id);
        if (dr.HasRows)
        {
            dr.Read();
            txtProjectNoteTitle.Text = dr["projNote_Title"].ToString();
            txtProjectNoteDescription.Text = dr["projNote_Note"].ToString();
            v_fileattached = dr["projnote_fileattached"].ToString();
            v_fileguid = dr["projnote_fileid"].ToString();

          
            if (v_fileattached !="")
            {
                trAttach.Visible = false;
                trhreflink.Visible = true;

                lnkAttachment.Text = v_fileattached;
               
            }
            else
            {
                trAttach.Visible = true;
                trhreflink.Visible = false;
            }
        }
    }

    public void UploadDocument()
    {
        if (fuUploadFile.PostedFile.ContentLength > 0)
        {
            string Apath = Server.MapPath("~/Documents/") ;
            if (!Directory.Exists(Apath))
            {
                Directory.CreateDirectory(Apath);
                string virtualpath = Server.MapPath("~/Documents" + "\\" + fn);
                fuUploadFile.PostedFile.SaveAs(virtualpath);  //FileUpload1.PostedFile property Holds client side path
            }
            else
            {
                string virtualpath = Server.MapPath("~/Documents" + "\\" + fn);
                fuUploadFile.PostedFile.SaveAs(virtualpath);  //FileUpload1.PostedFile property Holds client side path
            }
        }
    }

    #endregion
}

Aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/ProjectPlanner/projPlannerMaster.master"
    AutoEventWireup="true" CodeFile="CreateProjectNotes.aspx.cs" Inherits="ProjectPlanner_CreateProjectNotes" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

   

<%--   
        --%>

        <%--

--%>

           
           

           
           
           
                            ID="tabContainerProjects" ActiveTabIndex="1">
               
               
                   
                       

                       
                           
                               
                               
                           
                           
                               
                               
                           

                           

                               
                               
                                <%----%>
                           

                            

                               
                               
                               
                               
                           

                           

                               
                               
                           
                       

Note Title*
Note Description*	runat="server">
Attach File*	ValidationGroup="UploadFile" ControlToValidate="fuUploadFile" Font-Bold="true"                                         ErrorMessage="Please select the File to upload." SetFocusOnError="true">                                                                                                                 ID="RegularExpressionValidator1" runat="server" ValidationGroup="UploadFile"                                         ErrorMessage="Only Doc, Xls, Txt files are allowed to be uploaded!"                                         ValidationExpression="[a-zA-Z0_9].*\b(.Doc|.DOC|.doc|.Xls|.xls|.XLS|.Txt|.TXT|.txt)\b"                                         Display="Dynamic" ControlToValidate="fuUploadFile" SetFocusOnError="true">
Attachment*

                   
               

               
                   

                       

                           
                               
                               
                               
                               
                               
                           
                           
                               
                                    ">
                                       
                                       
                                       
                                       
                                       
                                   
                               
                           
                       

Sno	Notes Title	Notes Description	FileName	Actions
<%#(((RepeaterItem)Container).ItemIndex+1).ToString()%>	<%#Eval("projNote_Title") %>	<%#Eval("projNote_Note") %>	<%#Eval("projNote_FileAttached") %>	runat="server" ImageUrl="~/resources/Images/edit.png" />                                                                                             CommandArgument='<%#Eval("projNote_Id") %>' runat="server" ImageUrl="~/resources/Images/viewDetails_Icon.png" />

                       

                   
               
           
        <%--
    --%>

What is happening when i click on lnkAttachment , btnmethodone_click gets fired . In v_fileguid it is giving null whereas it should give file Guid which i am storing in it . How to resolve this.

Thanx