Вывод результата выполнения CMD в textbox кириллицей

Public Class Form1
    Function ActionNet(ByVal File As String, ByVal Text As String)
        Dim Gstart As New Process()
        Gstart.StartInfo.FileName = File
        Gstart.StartInfo.Arguments = Text
 
        Gstart.StartInfo.RedirectStandardError = True
        Gstart.StartInfo.RedirectStandardOutput = True
        Gstart.StartInfo.RedirectStandardInput = True
        Gstart.EnableRaisingEvents = True
 
        Application.DoEvents()
        Gstart.StartInfo.CreateNoWindow = True
        Gstart.StartInfo.UseShellExecute = False
 
        AddHandler Gstart.ErrorDataReceived, AddressOf Gstart_OutputData
        AddHandler Gstart.OutputDataReceived, AddressOf Gstart_OutputData
 
        Gstart.Start()
        Gstart.BeginErrorReadLine()
        Gstart.BeginOutputReadLine()
        Return File
    End Function
    Delegate Sub UpdateTextBoxDelg(ByVal text As String)
    Dim myDelegate As UpdateTextBoxDelg = New UpdateTextBoxDelg(AddressOf UpdateTbox)
 
    Public Sub UpdateTbox(ByVal Text As String)
        TextBox2.AppendText(Text & System.Environment.NewLine)
    End Sub
    Public Sub Gstart_OutputData(ByVal sender As Object, ByVal e As DataReceivedEventArgs)
        If Me.InvokeRequired Then
            Me.Invoke(myDelegate, e.Data)
        End If
    End Sub
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "Токмак" Then
            TextBox2.Text = ""
            ActionNet("ping", "8.8.8.8")
            TextBox2.Focus()
        End If
        If TextBox1.Text = "Сеть" Then
            TextBox2.Text = ""
            ActionNet("nmap", "-sP 10.108.8.*")
            TextBox2.Focus()
        End If
    End Sub
 
    Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged, TextBox2.TextChanged
 
    End Sub
 
    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
 
    End Sub
End Class

Gstart.StartInfo.StandardOutputEncoding = System.Text.Encoding.GetEncoding(866)