VB.Net (win App) ติดปัญหา อ่านข้อมูลภาษาไทยจาก text File ใส่ใน Datagridview ไม่ได้ค่ะ

Imports System.Data
Imports System.Data.SqlClient
Imports System.Globalization
Imports System.IO



Public Class Form1

    Dim filePath As String
    Dim MyConnection As System.Data.OleDb.OleDbConnection
    Dim DtSet As System.Data.DataSet
    Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
    Dim DataTb As DataTable




    Private Sub BtnBrowse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnBrowse.Click
        Dim dpath As String
        dpath = FolderBrowserDialog1.SelectedPath()
        OpenFileDialog1.InitialDirectory = dpath
        OpenFileDialog1.ShowDialog()
        TextBox1.Text = OpenFileDialog1.FileName()

        Dim objOpenFileDialog As New OpenFileDialog

        With objOpenFileDialog
            .DefaultExt = "txt"
            '.FileName = "Test" 
            .Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"
            .FilterIndex = 1
            '.OverwritePrompt = True 
            .Title = "Open Text File"
        End With

        If objOpenFileDialog.ShowDialog = Windows.Forms.DialogResult.OK Then

            Try

                'Open or Create the file 
                filePath = System.IO.Path.Combine(My.Computer.FileSystem.SpecialDirectories.MyDocuments, objOpenFileDialog.FileName)
                Call DisPlayTextFile()

            Catch fileException As Exception
                Throw fileException
            End Try

        End If

        'Clean up 
        objOpenFileDialog.Dispose()
        objOpenFileDialog = Nothing
    End Sub

    Private Sub DisPlayTextFile()

        Dim myReader As New System.IO.StreamReader(filePath, System.Text.Encoding.Default)
        ' Dim myReader As New System.IO.StreamReader(filePath, System.Text.Encoding.UTF8)
        ' Dim myReader As New System.IO.StreamReader(filePath, System.Text.UnicodeEncoding.Default)
        ' Dim myReader As New System.IO.StreamReader(filePath, System.Text.Encoding.GetEncoding(874))
       
        Dim Dt As New DataTable
        Dim Dr As DataRow
        Dim Line As String

        Dt.Columns.Add("Part No", GetType(String))
        Dt.Columns.Add("Part Name", GetType(String))
        Dt.Columns.Add("Part Type", GetType(String))
        Dt.Columns.Add("Std Pcs.", GetType(Decimal))
        Dt.Columns.Add("Unit", GetType(String))
.......