Export Sharepoint listitem versions

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In this code am exporting sharepoint list item versions.
Here is the code below.


protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                if (!String.IsNullOrEmpty(Request.QueryString["ItemId"]) && !String.IsNullOrEmpty(Request.QueryString["ListId"]))
                {
                    string itemID = Request.QueryString["ItemId"];
                    string listID = Request.QueryString["ListId"];
                    listID = listID.Substring(1, listID.Length - 2);                  
                    DataTable dt = new DataTable();
                    bool firstTime = true;
                    using (SPSite site = new SPSite(SPContext.Current.Site.Url))
                    {
                        using (SPWeb web = site.OpenWeb())
                        {
                            Guid gid = new Guid(listID);
                            SPList DocLib = web.Lists[gid];
                            if (DocLib.EnableVersioning == true)
                            {                    
                                foreach (string itemstr in itemID.Split('|'))
                                {
                                    if (!String.IsNullOrEmpty(itemstr))
                                    {
                                        SPListItem item = DocLib.GetItemById(Convert.ToInt32(itemstr));
                                        SPListItemVersionCollection versionCollection = item.Versions;
                                        if (versionCollection.Count > 0)
                                        {                                          
                                            foreach (SPListItemVersion versionItem in versionCollection)
                                            {
                                                if (firstTime == true)
                                                {
                                                    foreach (SPField fieldName in versionItem.Fields)
                                                    {
                                                        dt.Columns.Add(fieldName.StaticName);
                                                    }
                                                    firstTime = false;
                                                }                                
                                                DataRow dr = dt.NewRow();
                                                foreach (SPField fieldValue in versionItem.Fields)
                                                {
                                                    dr[fieldValue.StaticName] = versionItem[fieldValue.StaticName];
                                                }                                            
                                                dt.Rows.Add(dr);
                                            }                                          
                                        }
                                    }
                                }
                                ExporToExcel(dt);                                                          
                            }                          
                            if(!String.IsNullOrEmpty(Request.QueryString["Purl"]))
                            {
                                Response.Redirect(Request.QueryString["Purl"]);
                            }
                            else
                            {
                                Response.Redirect(web.Lists[gid].DefaultViewUrl);
                            }                          
                        }
                    }
                }
            }
            catch (Exception ex)
            {
               
            }
        }

        private void ExporToExcel(DataTable dt)
        {        
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.Buffer = true;
            HttpContext.Current.Response.ContentType = "application/ms-excel";
            HttpContext.Current.Response.Write(@"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">");
            HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=Versions.xls");
            HttpContext.Current.Response.Charset = "utf-8";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250");          
            HttpContext.Current.Response.Write("<font style='font-size:10.0pt; font-family:Calibri;'>");
            HttpContext.Current.Response.Write("<BR><BR><BR>");          
            HttpContext.Current.Response.Write("<Table border='1' bgColor='#ffffff' " +
              "borderColor='#000000' cellSpacing='0' cellPadding='0' " +
              "style='font-size:10.0pt; font-family:Calibri; background:white;'> <TR>");          
            int columnscount = dt.Columns.Count;
            for (int j = 0; j < columnscount; j++)
            {    
                HttpContext.Current.Response.Write("<Td>");              
                HttpContext.Current.Response.Write("<B>");
                HttpContext.Current.Response.Write(dt.Columns[j].ColumnName);
                HttpContext.Current.Response.Write("</B>");
                HttpContext.Current.Response.Write("</Td>");
            }
            HttpContext.Current.Response.Write("</TR>");
            foreach (DataRow row in dt.Rows)
            {
                HttpContext.Current.Response.Write("<TR>");
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    HttpContext.Current.Response.Write("<Td>");
                    HttpContext.Current.Response.Write(row[i].ToString());
                    HttpContext.Current.Response.Write("</Td>");
                }

                HttpContext.Current.Response.Write("</TR>");
            }
            HttpContext.Current.Response.Write("</Table>");
            HttpContext.Current.Response.Write("</font>");
            HttpContext.Current.Response.Flush();
            HttpContext.Current.Response.End();
        }

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