RadGrid - "Row" Type DoubleClick BatchEdit, saveChanges command how to get data from grid?

Hi!

   I use <telerik:RadGrid>, <BatchEditingSettings EditType="Row" OpenEditingEvent="DblClick" /> for data editing,

My problem is when the saveChanges button being clicked, It triggered - BatchEditCommand(object sender, Telerik.Web.UI.GridBatchEditingEventArgs e) event, however, (I referenced from searched samples) when trying to loop through and get data within the grid:

foreach (GridBatchEditingCommand gridBECmd in e.Commands)

{}

the e.Commands.count is always 0, therefore, I couldn't get data to save. 

Can anyone give any advises?

thanks!

Sharon