context.Response.Clear();
context.Response.AddHeader("content-disposition",
string.Format("attachment; filename=\"{0}\"", file.Name));
context.Response.ContentType = "audio/wav";
context.Response.WriteFile(file.FullName, false);

context.Response.ClearContent();
context.Response.ClearHeaders();
context.Response.AddHeader("content-disposition", string.Format("attachment; filename=\"{0}\"", context.Request.QueryString["callid"].ToString() + ".wav"));        
context.Response.ContentType = "audio/wav";                    

using (SqlConnection cnn = new SqlConnection(ConfigurationManager.ConnectionStrings["base"].ConnectionString))
{
            cnn.Open();
            SqlCommand cmd = new SqlCommand("SELECT [attachment] FROM table where callid = @callid", cnn);
            cmd.Parameters.AddWithValue("@callid", context.Request.QueryString["callid"].ToString());

            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.Read())
            {
                byte[] byteArray = (byte[])dr["attachment"];

                context.Response.OutputStream.Write(byteArray, 0, byteArray.Length);
                //context.Response.BinaryWrite(byteArray);
                //context.Response.AppendHeader("Content-Length", ((byte[])dr["attachment"]).Length.ToString());                
            }
}
//context.Response.Flush();
//context.Response.End();