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how to refresh the xamgrid when data source is changed

Hi all,

I am populating xamgrid with data based on selection from dropdown value. My sql has large number of records so i am using virtual collection with xamgrid. After first selection in dropdown, it is populating data. but when i change the selection. Nothing is happening, in code it is query sql again and getting data but data is not refreshed on grid. I am using Domain Class Service to fetch the data. Also how i can set the anticipated value for virtual collection, i don't know the number of records in it.

Also filteration and sorting is not working. Even new item addition. Only editing of data is working fine.

Please help, as it is very urgent. Last month only we got the license.