c# - Why Invalidate() should be called outside the control then it can work? -

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I am using C # + winforms to develop software.
I have a UserControl that has many DataGrid views in 

  datagridview1.datasource = dc.doctor;

I use linq to populate the datagrid view with Dataset, because I need to refresh the datasheet to update the records, so I create a new datacentext and data Allocate the source again.

Select dc.doctor from datagridview1.datasource = p;

The first time I found, although I reset the data source, the datagrid view can not be refreshed yet, someone tells me that I should call the invalid work on the Datagrid view, I tried to some extent, it works. But if I call invalidity within the class of the user control, then this will not work.
If I'm creating a public function on the square of the user control, then it's user control. Call with Refresher (), then it works.

Does anyone tell me what am I missing? When a call invalidates, when will it really work?
Thanks in advance!

Deactivating the work eliminates all other things like data loading ...


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