How to use checkbox for 2 queries for population from DataGridView in vb.net

How to use checkbox for 2 queries for population from DataGridView in vb.net?.

I tried with the code below the population in the datagridview became empty please recommend because maybe my code implementation has something wrong.

tHANKS

 Private Sub PopulateDataGridView()
        Try
            dt = New DataTable
            If CheckBox1.Checked = False Then
Dim query = "select ITM,ITC,QOH,PRS,PRSOBBRT,PRSOBNET,SHI,FILENAME1,FILENAME2,FILENAME3,FILENAME4,FILENAME5,FILENAME6,SUBFOLDERP FROM IFG WHERE QOH > 0 AND GDN = 'A.04.01.002.001'"
 Else
                If CheckBox1.Checked = True Then
                    Dim query = "select ITM,ITC,QOH,PRS,PRSOBBRT,PRSOBNET,SHI,FILENAME1,FILENAME2,FILENAME3,FILENAME4,FILENAME5,FILENAME6,SUBFOLDERP FROM IFG WHERE QOH < 0 AND GDN = 'A.04.01.002.001'"
 Using adapter As New OleDbDataAdapter(query, cn.ToString)
adapter.Fill(dt)
 End Using
                    Me.GridControl1.DataSource = dt
                    Me.GridControl1.Refresh()
GridView1.Columns("SUBFOLDERP").Visible = False
                    GridView1.Columns("FILENAME1").Visible = False
                    GridView1.Columns("FILENAME2").Visible = False
                    GridView1.Columns("FILENAME3").Visible = False
                    GridView1.Columns("FILENAME4").Visible = False
                    GridView1.Columns("FILENAME5").Visible = False
                    GridView1.Columns("FILENAME6").Visible = False
 End If
            End If
        Catch myerror As OleDbException
            MessageBox.Show("Error: " & myerror.Message)
        Finally
        End Try
    End Sub