protected void DeleteFile(object sender, EventArgs e)
    {
        string filePath = (sender as LinkButton).CommandArgument;
        File.Delete(filePath);
        //Response.Redirect(Request.Url.AbsoluteUri);
        if (IsPostBack)
        {
            if (filedrop.SelectedValue == "Основополагающие документы СМК")
            {
                string[] filePaths = Directory.GetFiles(Server.MapPath("" + filedrop.SelectedValue + ""));
                List<ListItem> files = new List<ListItem>();
                foreach (string filePath1 in filePaths)
                {
                    files.Add(new ListItem(Path.GetFileName(filePath1), filePath1));
                }
                GridView1.DataSource = files;
                GridView1.DataBind();
            }
        }
    }