Help me in following code!! ASP.net using C# and windows Azure

public partial class Fileupload : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           
                gvbind();
        }
        filestore fs = new filestore();
        private static string parseUsingPDFBox(string filename)
        {
            org.apache.pdfbox.pdmodel.PDDocument doc = PDDocument.load(filename);
            PDFTextStripper stripper = new PDFTextStripper();
            string text = stripper.getText(doc);
            doc.close();
            return text;
        }
        string filecontent;
        string encrypt;
        string encrypt1;
        string encrypt2;
        string encrypt3;
        protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (FileUpload1.HasFile)
                {
                     string _fileExt = System.IO.Path.GetExtension(FileUpload1.FileName);
                     if (_fileExt.ToLower() == ".docx" || _fileExt.ToLower() == ".txt" || _fileExt.ToLower() == ".doc" || _fileExt.ToLower() == ".pdf")
                     {
                         string Index = string.Empty;
                         try
                         {
                             SetContainerAndPermissions();
                         }
                         catch
                         {

                         }
                         // Retrieve storage account from connection-string
                         CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("BlobConn"));

                         // Create the blob client
                         CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

                         // Retrieve reference to a previously created container
                         CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");

                         Index = Guid.NewGuid().ToString();
                         string uploadedDocName = "Document_" + Index + "#" + FileUpload1.PostedFile.FileName;

                         CloudBlockBlob blob = container.GetBlockBlobReference(uploadedDocName);
                         blob.Metadata["FileType"] = FileUpload1.PostedFile.ContentType;
                         blob.Properties.ContentType = FileUpload1.PostedFile.FileName;
                         blob.UploadFromStream(FileUpload1.FileContent);

                         Connection ins = new Connection();
                         int result = ins.insert(FileUpload1.PostedFile.FileName.ToString(), blob.Uri.ToString(), FileUpload1.PostedFile.ContentLength.ToString() + " bytes", FileUpload1.PostedFile.ContentType.ToString(), Index, DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToLongTimeString(), "UnBlocked",Session["username"].ToString());
                         string filename = Path.GetFileName(FileUpload1.FileName);
                         FileUpload1.SaveAs(Server.MapPath("~/") + filename);
                         string strFileName = System.IO.Path.GetFullPath(Server.MapPath("~/" + filename));
                         string e1 = Path.GetExtension(strFileName);
                         if (e1.ToLower() == ".pdf")
                         {
                             string file = parseUsingPDFBox(strFileName);
                             file = file.Replace("'", "''");
                             byte[] mybyte = System.Text.Encoding.UTF8.GetBytes(file);
                             string returntext = System.Convert.ToBase64String(mybyte);
                          //   returntext = returntext.Trim('\'');
                              
                             encrypt = returntext;
                             byte[] mybyte1 = System.Convert.FromBase64String(returntext);
                             string returntext1 = System.Text.Encoding.UTF8.GetString(mybyte);
                             filecontent = returntext1;
                             int len = returntext.Length;
                             int split = len / 3;
                             string[] word = new string[3];
                             int j = 0;
                             int i;
                             int h;
                             int g;
                             word[0] += returntext.Substring(0, split);
                             word[1] += returntext.Substring(split, split);
                             word[2] += returntext.Substring(split + split, split);

                             encrypt1 = word[0];
                             encrypt2 = word[1];
                             encrypt3 = word[2];
                         }
                         
                         
                         string scret = GetRandomString();
                         fs.upload(FileUpload1.PostedFile.FileName.ToString(), blob.Uri.ToString(), filecontent, encrypt, encrypt1, encrypt2, encrypt3, scret,Session["username"].ToString());
                         Label1.Text = "Thank you! Your File Upload Successfully.";
                         Label1.ForeColor = System.Drawing.Color.Black;
                         //string filename = Path.GetFileName(FileUpload1.FileName);
                         //FileUpload1.SaveAs(Server.MapPath("~/") + filename);
                         //string strFileName = System.IO.Path.GetFullPath(Server.MapPath("~/"+filename));
                         //   File.Encrypt(strFileName);
                         // btnEncryp(strFileName);
                         //  EncryptFile(strFileName, "c:\\myfileEncrypted.rar", "1234512345678976");
                         gvbind();
                     }
                     else
                     {
                         Label1.Text = "Please Select Valid Files to Upload";
                     }
                }
                else
                {
                    Label1.Text = "Please Select any Files to Upload";
                    Label1.ForeColor = System.Drawing.Color.Red;
                }

            }
            catch
            {
                //throw new Exception("Error"+ex.ToString());
                Label1.Text = "Sorry! Error occured while upload your Files.";
                Label1.ForeColor = System.Drawing.Color.Red;
            }
        }