พอดีผมรันโปรแกมแล้วขึ้น error The ConnectionString property has not been initialized. แก้ไม่ได้สักที่ครับผม

    Private Sub member_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TextBox3.Text = Date.Today
        TextBox4.Text = DateAdd(DateInterval.Year, 1, Date.Today)
        'showDataGrid("Select memId,memPerfix,memFname,memLname,memGender,memIdcard,memNumber,moo,memZone,memDistrict,memPropvince,memPostcode,memTel,memDateRegis,memDateExp from Member")
        showDataGrid("Select * from Member")
    End Sub
    Public Sub connectData() Handles MyBase.Load
        Dim s As String
        If conn.State = ConnectionState.Open Then conn.Close()
        s = "Provider = Microsoft.Jet.OLEDB.4.0;"
        s = s + "Data Source = D:\LIBARY1\Library.mdb;"
        conn.ConnectionString = s
        conn.Open()

    End Sub
    Public Function ExecuteSQL(ByVal prmSQL As String) As Boolean
        connectData()
        Dim addCom As New OleDbCommand
        With addCom
            .CommandType = CommandType.Text
            .CommandText = prmSQL
            .Connection = conn
            .ExecuteNonQuery()
        End With
        ExecuteSQL = True
    End Function
    Public Function ExecuteReader(ByVal prmSQL As String) As OleDbDataReader
        Dim dr As OleDbDataReader
        Dim comm As New OleDbCommand
        connectData()
        With comm
            .CommandType = CommandType.Text
            .CommandText = prmSQL
            .Connection = conn
            dr = .ExecuteReader()
            Return dr
        End With
    End Function

    Private Sub showDataGrid(ByVal sql As String)
        Dim DS As DataSet
        Dim DA As OleDbDataAdapter

        DS = New DataSet()
        DA = New OleDbDataAdapter(sql, conn)
        DA.Fill(DS, "Mem")
        'DA.Fill(DT)
        Try
            DataGridView1.[ReadOnly] = True
            If DS.Tables("Mem").Rows.Count > 0 Then
                DataGridView1.DataSource = DS.Tables("Mem")
                DataGridView1.Columns("memId").HeaderText = "รหัสสมาชิก"
                DataGridView1.Columns("memPerfix").HeaderText = "คำนำหน้าชื่อ"
                DataGridView1.Columns("memFname").HeaderText = "ชื่อ"
                DataGridView1.Columns("memLname").HeaderText = "นามสกุล"
                DataGridView1.Columns("memGender").HeaderText = "เพศ"
                DataGridView1.Columns("memIdcard").HeaderText = "รหัสบัตรประชาชน"
                DataGridView1.Columns("memNumber").HeaderText = "บ้านเลขที่"
                DataGridView1.Columns("moo").HeaderText = "หมู่"
                DataGridView1.Columns("memZone").HeaderText = "แขวง"
                DataGridView1.Columns("memDistrict").HeaderText = "เขต"
                DataGridView1.Columns("memPropvince").HeaderText = "จังหวัด"
                DataGridView1.Columns("memPostcode").HeaderText = "รหัสไปรษณีย์"
                DataGridView1.Columns("memTel").HeaderText = "เบอร์โทร"
                DataGridView1.Columns("memDateRegis").HeaderText = "วันที่ออกบัตร"
                DataGridView1.Columns("memDateExp").HeaderText = "วันหมดอายุ"
            Else
                MessageBox.Show("ไม่พบรายการที่ค้นหา", "เตือน", MessageBoxButtons.OK, MessageBoxIcon.[Error])
                DataGridView1.DataSource = DS.Tables("Mem")
            End If
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Sub