Castle ActiveRecord 在GridView数据绑定时候的一个问题

在ASP.NET Grid中编辑第一行Row，RowUpdating事件的时候，如果这样写：

  protected   void  grdCatalog_RowUpdating( object  sender, GridViewUpdateEventArgs e)
        {
             this .grdCatalog.SelectedIndex  =  e.RowIndex;

             int  id  =  ( int ) this .grdCatalog.SelectedValue;
            Catalog ca  =  CatalogDataAccess.FindCatalogByID(id);

            ca.Name  =  (grdCatalog.Rows[e.RowIndex].Cells[ 1 ].Controls[ 0 ]  as  TextBox).Text;
            ca.Comment  =  (grdCatalog.Rows[e.RowIndex].Cells[ 2 ].Controls[ 0 ]  as  TextBox).Text;
            ca.Culture  =
                (grdCatalog.Rows[e.RowIndex].Cells[ 3 ].FindControl( " drpCulture " )  as  DropDownList).SelectedValue;

            ca.Update();

                 this .grdCatalog.EditIndex  =   - 1 ;
                  this .grdCatalog.DataSource  =  CatalogDataAccess.FindAll( this .PageIndex, pageSize);
                 this .grdCatalog.DataBind();
            
        }     

那么在DataBind()的时候就说报告一个类型不匹配的错误。如果编辑第一行以外的行都正常，就第一行不行。
经过反复跟踪调试，我发现如果这样以来好像第一行的对象内部的字段没有被ActiveRecord赋上值，所以出错。
现在我想了个笨办法把问题解决了，不知道有没有更好的办法。
方法的思路是这样的：在Update的时候SessionScope已经用过了，那么在获得DataSource的时候就再新用一个SessionScope。用下面这样的代码就解决问题了：

         protected   void  grdCatalog_RowUpdating( object  sender, GridViewUpdateEventArgs e)
        {
             this .grdCatalog.SelectedIndex  =  e.RowIndex;

             int  id  =  ( int ) this .grdCatalog.SelectedValue;
            Catalog ca  =  CatalogDataAccess.FindCatalogByID(id);

            SessionScope scope  =  HttpContext.Current.Items[ " nh.sessionscope " ]  as  SessionScope;
            
            ca.Name  =  (grdCatalog.Rows[e.RowIndex].Cells[ 1 ].Controls[ 0 ]  as  TextBox).Text;
            ca.Comment  =  (grdCatalog.Rows[e.RowIndex].Cells[ 2 ].Controls[ 0 ]  as  TextBox).Text;
            ca.Culture  =
                (grdCatalog.Rows[e.RowIndex].Cells[ 3 ].FindControl( " drpCulture " )  as  DropDownList).SelectedValue;

            ca.Update();
             if  (scope  !=   null )
            {
                scope.Dispose();
            }
             

             using (scope  = new  SessionScope())
            {
                HttpContext.Current.Items.Remove( " nh.sessionscope " );
                HttpContext.Current.Items.Add( " nh.sessionscope " ,scope);
                 this .grdCatalog.EditIndex  =   - 1 ;
               
                 this .grdCatalog.DataSource  =  CatalogDataAccess.FindAll( this .PageIndex, pageSize);
                 this .grdCatalog.DataBind();
            }
        }   

代码中涉及一些在ASP.NET用使用ActiveRecord的方法和机制，请参看 http://www.castleproject.com/