Private col_models As List(Of string) = New List(Of string)

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        col_models.Add("первая строка")
        col_models.Add("вторая строка")
        col_models.Add("Третья строка")

        DataGridView1.DataSource = col_models
    End Sub
End Class