Next, Previoust......Button Coding in VB.NET

First Declare two variables n and mx.............

Dim n As Integer = 0
    Dim mx As Integer

Make one function for moving........

Public Sub next1()

        TextBox1.Text = ds.Tables(0).Rows(n).Item(0).ToString
        TextBox2.Text = ds.Tables(0).Rows(n).Item(1).ToString
        TextBox3.Text = ds.Tables(0).Rows(n).Item(2).ToString

    End Sub






Here, it will show 'n' th row's data and for first record n = 0 and for last data n = mx -1

MX means maximum data but data start indexing start with 0 so last data is n= mx-1


For first button........

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click

        cn.Open()

        n = 0

        next1()

        cn.Close()

    End Sub

For Last Button....

 Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click

        cn.Open()

        mx = ds.Tables(0).Rows.Count

        n = mx - 1

        next1()

        cn.Close()

    End Sub

For Next Button.......

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click

        cn.Open()

        mx = ds.Tables(0).Rows.Count

        If (n <> mx - 1) Then

            n = n + 1

            next1()

        Else

            MsgBox("This is your last data")

        End If

        cn.Close()

    End Sub

For Previous Data............

 Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        cn.Open()
        mx = ds.Tables(0).Rows.Count
        If (n <> 0) Then
            n = n - 1
            next1()

        Else
            MsgBox("This is your first data")

        End If
        cn.Close()
    End Sub