utf8 and unicode format file is not getting uploaded

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ASP.NET

pblm is in dis code dat utf8 and unicode format file is not getting uploaded, code is working only for ANSI format file. I want to upload all type of format file using dis code whatever ANSI, utf8 nd unicode

Sir please Help me.

Thanks in advance.

my code is.........
---------------------------------

using System;
using System.Data;
using System.IO;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Bibliometric.BusinessLogicLayer.BibliometricBO;

public partial class Publication : System.Web.UI.Page
{
    #region To Declare variable and Object
    PublicationBO objPublication = new PublicationBO();
    CitationBO objCitation = new CitationBO();
    ReportBO objReport = new ReportBO();
    #endregion

    #region Page Load Event
    protected void Page_Load(object sender, EventArgs e)
    {
        //if (!IsPostBack)
        //{
        //    ddlCustomer.Items.Insert(0, "--Select--");
        //}
    }
    #endregion

    #region btnSave event to save publication detail
    protected void btnSave_Click(object sender, EventArgs e)
    {
        try
        {
            string ScientistName = txtScientistName.Text.Trim();
            string ScientistCitedName = txtCusCitationName.Text.Trim();
            string OPFileName = txtOPFilename.Text.Trim();
            string AuthorName = txtAuthorName.Text.Trim().ToUpper();
            string Year = txtYear.Text.Trim();
            string JournalAbbr1 = txtJournal.Text.Trim().ToUpper();
            string JournalAbbr = JournalAbbr1.Substring(0, JournalAbbr1.IndexOf('(')).Trim();
            string Volume = txtVolume.Text.Trim();
            string BPage = txtPagefrom.Text.Trim();
            string IFYear = txtIFYear.Text.Trim();
            if (txtUploadFileName.HasFile)
            {
                HttpPostedFile file = txtUploadFileName.PostedFile;
                string filepath = file.FileName;
                if (filepath != "")
                {
                    string ext = filepath.Substring(filepath.LastIndexOf('.') + 1, 3);
                    if (filepath.Substring(filepath.LastIndexOf('.') + 1, 3).ToString().ToUpper() != "TXT")
                        lblMsg.Text = "File is not in .txt format !!";
                    else
                    {
                        string filename = GetFileName(file);
                        file.SaveAs(Server.MapPath(filename));
                        string path = Server.MapPath(filename);
                        //call method to parse the text file into XML
                        string CitationXML = objCitation.ParseTXTFile(path);

                        //save customer publication detail
                        string UploadFileName = filename;

                        #region Store all control value in viewstate
                        ViewState["AuthorName"] = AuthorName;
                        ViewState["Year"] = Year; ViewState["Journal"] = JournalAbbr; ViewState["Volume"] = Volume;
                        ViewState["BPage"] = BPage;
                        #endregion

                        //call method to check file name
                        string ReturnText = objPublication.CheckFileName(ScientistName, ScientistCitedName, UploadFileName, OPFileName);
                        if (ReturnText.Contains("upload"))
                        {
                            lblMsg.Text = ReturnText;
                        }
                        else if (ReturnText.Contains("output"))
                        {
                            lblMsg.Text = ReturnText;
                        }
                        else
                        {
                            int ReturnValue = 0;
                            if (btnSave.Text == "Save")
                            {
                                ReturnValue = objPublication.SavePublicationDetail(CitationXML, ScientistName, ScientistCitedName, UploadFileName, OPFileName, AuthorName, Year, JournalAbbr, Volume, BPage,IFYear);
                                if (ReturnValue > 0)
                                {
                                    ViewState["PublicationID"] = ReturnValue;
                                    lblMsg.Text = "Your record saved successfully!";
                                    txtAuthorName.Text = ""; txtYear.Text = ""; txtJournal.Text = ""; txtVolume.Text = ""; txtPagefrom.Text = "";
                                    btnBack.Visible = true;
                                    divReport.Attributes.Add("style", "visibility:visible");
                                }
                            }
                            if (btnSave.Text == "Update")
                            {
                                int PublicationID = Convert.ToInt32(ViewState["PublicationID"].ToString());
                                ReturnValue = objPublication.UpdatePublicationDetail(PublicationID, CitationXML, ScientistName, ScientistCitedName, UploadFileName, OPFileName, AuthorName, Year, JournalAbbr, Volume, BPage,IFYear);
                                if (ReturnValue > 0)
                                {
                                    ViewState["PublicationID"] = ReturnValue;
                                    lblMsg.Text = "Your record updated successfully!";
                                    txtAuthorName.Text = ""; txtYear.Text = ""; txtJournal.Text = ""; txtVolume.Text = ""; txtPagefrom.Text = "";
                                    btnBack.Visible = true; btnSave.Text = "Save";
                                    divReport.Attributes.Add("style", "visibility:visible");
                                }
                            }
                            ViewState["PublicationID"] = ReturnValue.ToString();
                        }
                        File.Delete(path);///Delete file
                    }
                }
            }
            else
            {
                //save customer publication detail               

                #region Store all control value in viewstate
                ViewState["AuthorName"] = AuthorName;
                ViewState["Year"] = Year; ViewState["Journal"] = JournalAbbr; ViewState["Volume"] = Volume;
                ViewState["BPage"] = BPage;
                #endregion
                //call method to check file name
                string ReturnText = objPublication.CheckFileName(ScientistName, ScientistCitedName, "uploadfilename.qmp", OPFileName);
                if (ReturnText.Contains("upload"))
                {
                    lblMsg.Text = ReturnText;
                }
                else if (ReturnText.Contains("output"))
                {
                    lblMsg.Text = ReturnText;
                }
                else
                {
                    int ReturnValue = 0;
                    if (btnSave.Text == "Save")
                    {
                        ReturnValue = objPublication.SavePublicationDetailWithoutCitation(ScientistName, ScientistCitedName, OPFileName, AuthorName, Year, JournalAbbr, Volume, BPage,IFYear);
                        if (ReturnValue > 0)
                        {
                            ViewState["PublicationID"] = ReturnValue;
                            lblMsg.Text = "Your record saved successfully!";
                            txtAuthorName.Text = ""; txtYear.Text = ""; txtJournal.Text = ""; txtVolume.Text = ""; txtPagefrom.Text = "";
                            btnBack.Visible = true;
                            divReport.Attributes.Add("style", "visibility:visible");
                        }
                    }
                    if (btnSave.Text == "Update")
                    {
                        int PublicationID = Convert.ToInt32(ViewState["PublicationID"].ToString());
                        ReturnValue = objPublication.UpdatePublicationDetailWithoutCitation(PublicationID, ScientistName, ScientistCitedName, OPFileName, AuthorName, Year, JournalAbbr, Volume, BPage,IFYear);
                        if (ReturnValue > 0)
                        {
                            ViewState["PublicationID"] = ReturnValue;
                            lblMsg.Text = "Your record updated successfully!";
                            txtAuthorName.Text = ""; txtYear.Text = ""; txtJournal.Text = ""; txtVolume.Text = ""; txtPagefrom.Text = "";
                            btnBack.Visible = true; btnSave.Text = "Save";
                            divReport.Attributes.Add("style", "visibility:visible");
                        }
                    }
                    ViewState["PublicationID"] = ReturnValue.ToString();
                }
            }
        }
        catch { }
    }
    #endregion
    
    #region SelectedIndexChanged event og ddlCustomerType
    //protected void ddlCustomerType_SelectedIndexChanged(object sender, EventArgs e)
    //{
    //    if (ddlCustomerType.SelectedItem.ToString() != "--Select--")
    //    {
    //        //To bind the ddlCustomer
    //        objPublication.GetCustomer(Convert.ToInt16(ddlCustomerType.SelectedValue));
    //        ddlCustomer.DataTextField = "CustomerName";
    //        ddlCustomer.DataValueField = "CustomerID";
    //        ddlCustomer.DataSource = objPublication.CustomerDS;
    //        ddlCustomer.DataBind();
    //        ddlCustomer.Items.Insert(0, "--Select--");
    //    }
    //}
    #endregion

    #region btnBack event for showing previous record for update
    protected void btnBack_Click(object sender, EventArgs e)
    {
        txtAuthorName.Text = ViewState["AuthorName"].ToString(); txtYear.Text = ViewState["Year"].ToString(); txtJournal.Text = ViewState["Journal"].ToString();
        txtVolume.Text = ViewState["Volume"].ToString(); txtPagefrom.Text = ViewState["BPage"].ToString();
        btnSave.Text = "Update"; lblMsg.Text = "";
    }
    #endregion

    #region Generate word file report
    protected void ibtnGenerateWord_Click(object sender, ImageClickEventArgs e)
    {
        txtScientistName.Text = ""; txtCusCitationName.Text = ""; txtOPFilename.Text = "";
        objReport.GenerateTable(tblReport, tblReport1, tblReport2, tblReport3, Convert.ToInt16(ViewState["PublicationID"].ToString()), txtScientistName.Text.Trim());
        Response.Clear();
        Response.Buffer = true;
        string filedoc = txtOPFilename.Text.Trim();
        Response.AddHeader("content-disposition", "attachment;filename=" + filedoc + ".doc");
        Response.ContentEncoding = System.Text.Encoding.Default;
        Response.ContentType = "application/msword";
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
        this.pnlReport.RenderControl(oHtmlTextWriter);
        Response.Output.Write(oStringWriter.ToString());
        Response.Flush();
        Response.End();
    }
    #endregion

    #region method to find file name
    private string GetFileName(HttpPostedFile file)
    {
        int i = 0, j = 0;
        string filename;

        filename = file.FileName;
        do
        {
            i = filename.IndexOf(@"\", j + 1);
            if (i >= 0) j = i;
        } while (i >= 0);
        filename = filename.Substring(j + 1, filename.Length - j - 1);

        return filename;
    }
#endregion
}