RadGridView hierarchy force RowSourceNeeded event always

[ahmed]

Hello there , 

i have RadGridView hierarchy with 3 level

i want to do the following

1- when expand any row at the first level , i need to collapse any other expanded row.

2-  when expand any row at the first level i need to dispose any data source assigned to other rows , in other words i want to keep my memory to contain only the datasource of current expanded row.

for example

i expanded first row , then rowsourceneed event will be fired and second level will be binded

when expand second row , also rowsourceneed event will be fired and second level will be binded 

now i need to clear the datasource for first expanded row , and when first row expanded again it will force rowsourceneed event to be fired again

please help me.

regards,

Ahmed.

[Dess | Tech Support Engineer, Principal]

Hello Ahmed,

Thank you for writing.

You can use the RadGridView.ChildViewExpanded event to detect when a row is expanded. However, note that when using load on demand approach, the RowSourceNeeded event is fired once for a certain parent row and the child rows collection is internally stored in RadGridView. Expanding the same parent row for the second time won't trigger this event. This is the designed mechanism for on demand hierarchy.

I think that it would be more suitable to use RadVirtualGrid, where the whole data is populated by using the CellValueNeeded event. Additional information is available at the following link:
http://docs.telerik.com/devtools/winforms/virtualgrid/hierarchical-virtual-grid/hierarchical-data

I hope this information helps. Should you have further questions I would be glad to help.

 Regards,
Dess
Telerik