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How to "refresh" a Datagridview?

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Hi
In Form1 I have a Datagridview showing the content of a table from DataBase.

In Form2 I add or modify a row in that table. So, when I get back to Form1 I would want the DataGridView get updated automatically.

To populate the DGV I use a Linq To Sql query:
Code:

Query = From ..... ;
Me.DGV.DataSource = Query;

or

Code:

Query = From ..... ;
Me.BindingSource1.DataSource = Query ;
Me.DGV.DataSource = Me.BindingSource1 ;

I have been trying to use:
BindSource (as DataGridView.DataSource)
BindingSource.ResetBinding(False)
DGV.Refresh()
etc...

Also, I added a new row in the same Fomr1 and nothing happens.

Thanks for advance !!!

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