Obtaining files from grid

Hello community

I'm having problems in downloading files from a grid, i saw some solutions, all very similar, and but none solve my problem, i guess there must be some small mistake from my own. Can you help me?

I'm using layers architecture in Telerik ASP.NET ajax

//ACSX User Control

//Acsx.cs

protected void gvTimesheets_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)
{
    if (e.CommandName == "download_file")
    {
        GridDataItem item = (GridDataItem)e.Item;
        var itemIndex = e.CommandArgument;
    }
    protected void link1_Click(object sender, EventArgs e)
    {
        var model = listagembll.GetFileByID(ID);
        if (model.FileContent != null)
        {
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.AddHeader("Content-Type", "Application/octet-stream");
            Response.AddHeader("Content-Length", model.FileContent.Length.ToString());
            Response.AddHeader("Content-Disposition", "inline; ficheiro=" + model.Ficheiro + model.FileTipo); // inline ou attachment
            Response.BinaryWrite(model.FileContent);
            Response.Flush();
            Response.End();
        }
    }
}

//BLL GetFilebyID

public ListagemTimesheet GetFileByID(int ID)
{
    using (GestaoProjectosEntities lt = new GestaoProjectosEntities())
    {
        return lt.ListagemTimesheets.FirstOrDefault(a => a.ID == ID);
    }
}