protected void IkeltiDetalesFaila()
    {
        {
            if (IsPostBack)
            {
                Boolean fileOK = false;
                String path = Server.MapPath("~/App_Data/");
                if (FileUpload2.HasFile)
                {
                    String fileExtension =
                        System.IO.Path.GetExtension(FileUpload2.FileName).ToLower();
                    String[] allowedExtensions = { ".txt" };
                    for (int i = 0; i < allowedExtensions.Length; i++)
                    {
                        if (fileExtension == allowedExtensions[i]) // Checks file extension.
                        {
                            fileOK = true;
                        }
                    }
                }
                if (fileOK)
                {
                    try
                    {
                        FileUpload2.PostedFile.SaveAs(path  // Save uploaded file to App_Data folder.
                            + "U10b.txt");
                        Label8.ForeColor = System.Drawing.Color.Red;
                        Label8.Text = "Failas sėkmingai įkeltas!";
                    }
                    catch (Exception ex)
                    {
                        Label8.ForeColor = System.Drawing.Color.Red;
                        Label8.Text = "Failo negalima įkelti";
                    }
                }
                else
                {
                    Label8.ForeColor = System.Drawing.Color.Red;
                    Label8.Text = "Failo formatas netinkamas";
                }
            }
        }
    }