diff --git a/SGGL/FineUIPro.Web/common/PageBase.cs b/SGGL/FineUIPro.Web/common/PageBase.cs
index ad3324fd..10a87a40 100644
--- a/SGGL/FineUIPro.Web/common/PageBase.cs
+++ b/SGGL/FineUIPro.Web/common/PageBase.cs
@@ -251,7 +251,9 @@ namespace FineUIPro.Web
         {
             if (BLL.Funs.DBList.ContainsKey(System.Threading.Thread.CurrentThread.ManagedThreadId))
             {
-                BLL.Funs.DBList.Remove(System.Threading.Thread.CurrentThread.ManagedThreadId);
+                Model.SGGLDB db;
+                BLL.Funs.DBList.TryRemove(System.Threading.Thread.CurrentThread.ManagedThreadId,out db);
+                db.Dispose();
             }
         }