How do I read a text file line by line using VB.NET and displaying in a datagrid view

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VB

VS2010

DataGridView

I'm completely new to VB.NET and have been given a homework assignment. I need to be able to read certain lines and display them in a DateGridView. I have been able to link my notepad .txt file to the DGV, however it reads the whole file as opposed to the specific line. I have 4 buttons: btn1, btn2, btn3, btn4. I want each button to show the respective lines in the text file. After researching online for the past week, I'm still stuck. If anyone could help me, I would really appreciate it.

Text File ("database.txt")
c1 c2 c3
one 1-1 1-2
two 2-2 2-3
three 3-2 3-3
four 4-2 4-3

Public Class Form1

    Private Sub btn1_Click(sender As Object, e As EventArgs) Handles btn1.Click

        Dim lines = (From line In IO.File.ReadAllLines("database.txt") _
                    Select line.Split(CChar(vbTab))).ToArray
        For x As Integer = 0 To lines(0).GetUpperBound(0)
            DataGridView1.Columns.Add(lines(0)(x), lines(0)(x))
        Next
        For x As Integer = 1 To lines.GetUpperBound(0)
            DataGridView1.Rows.Add(lines(x))
        Next
    End Sub

End Class