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visual basic 2012, Visual Basic Programming

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I am a beginner in Visual basic 2012 and making a data management programme with visual basic 2012 as front end and MySql as back end. I want to filter data grid view table with List box (multiple selected) . When I select one item it works fine and when I select multiple items in the List box I do not have code can u help me please. I am able to get all the items of a column in the list box by following code

Query = "Select * from `rrrr.data`.`trial` "
COMMAND = New MySqlCommand(Query, MySqlConn)
READER = COMMAND.ExecuteReader
While READER.Read
Dim sCountry = READER.GetString("COUNTRY")
ListBox1.Items.Add(sCountry)
End While

But for filtering data when I use below query it does not work ( for multiple selected or more than one item ) It does not work Query which I use is-
Query = "Select * from `rrrr.data`.`trial` Where `COUNTRY`in (''" & ListBox1.SelectedItem& "'' )"

Kindly help me out
Also can I use Combobox and Checked List Box foor similar filtering
nimum 100 words accepted#

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