vb.net to access 2003 adding up a data

[urataru17]

hi there, i just want to ask for help about my codes in adding up data in my database using oledb connection. the codes is working during execution because the added item can be searched during execution only but once i close the application the data is not saved in the database.
Any help will be greatly appreciated. Thanks in advance.

Dim conn As New OleDb.OleDbConnection
    Dim comm As New OleDb.OleDbCommand
    Dim adap As New OleDb.OleDbDataAdapter
    
Public Function viewDetails(ByVal sqlRetrieve As String, ByVal sourceTable As String) As DataSet
        Dim result As New DataSet
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\db1.mdb;Persist Security Info=True"
        comm.CommandText = sqlRetrieve
        conn.Open()
        comm.Connection = conn
        adap.SelectCommand = comm
        adap.Fill(result, sourceTable)
        conn.Close()
        Return result
    End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim result As New DataSet
        result = viewDetails("SELECT * FROM tblTest WHERE fname = '" & TextBox5.Text & "'", "tblTest")
        TextBox1.Text = result.Tables(0).Rows(0).Item(0)
        TextBox2.Text = result.Tables(0).Rows(0).Item(1)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim result As New DataSet
        result = viewDetails("SELECT * FROM tblTest", "tblTest")
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\db1.mdb;Persist Security Info=True"

        

        conn.Open()
        Dim insertEntry As New OleDb.OleDbCommand("INSERT INTO tblTest VALUES(@fname, @lname)", conn)
        insertEntry.Parameters.Add("@fname", OleDb.OleDbType.VarChar, 20, "fname")
        insertEntry.Parameters.Add("@lname", OleDb.OleDbType.VarChar, 20, "lname")

        Dim dt As DataTable = result.Tables("tblTest")

        Dim newRow As DataRow = dt.NewRow()
        newRow("fname") = TextBox3.Text
        newRow("lname") = TextBox4.Text

        dt.Rows.Add(newRow)
        
        adap.InsertCommand = insertEntry
        adap.Update(result, "tblTest")
        result.AcceptChanges()
        MsgBox("done")
        conn.Close()
    End Sub