Object reference not set to instance of an object

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VB

MySQL

Hi
I am trying to create a stored procedure for retrieving data from tables. Code is

Public Sub SelectData()
        dim table,OPtable as string
        SqlQuery = "Select * from " & table & ""
        Sqlcommand = New MySqlCommand(SqlQuery, Conn)
        'Reader = Sqlcommand.ExecuteReader
        count = Sqlcommand.ExecuteScalar
        Dim Da As New MySqlDataAdapter
        Dim Ds As New DataSet
        Da.SelectCommand = Sqlcommand
        Da.Fill(Ds, OPtable)
        MessageBox.Show(Ds.Tables(OPtable).Rows(0)("Name")) -- All OK till here
End Sub

now when i call above procedure with following code

Private Sub BtnFirst_Click_1(sender As Object, e As EventArgs) Handles BtnFirst.Click
        table = "Ledgers"
        OPtable = "LEDG"

        Try
            SelectData()
            TxtName.Text = Ds.Tables("LEDG").Rows(2)("Name") // error occurs here

        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
End Sub

error is object reference not set to instance of an object

What I have tried:

when I copy code in stored procedure to button click event everything works fine.

I am trying to move records (first, last, next, previous). I was thinking of collecting records from a table into Dataset(Ds) and then move it as required. Is there any simpler way to do this?