VB.NET 2010 เออเร่อ unable to connect to any of the specified mysql hosts แก้ยังไงครับ

Imports MySql.Data.MySqlClient
Public Class Form1
    Dim MySqlConnection As MySqlConnection
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        MySqlConnection = New MySqlConnection()

        MySqlConnection.ConnectionString = "server=********; user id=********; password=********; database=*********; Pooling=false"
        Try
            MySqlConnection.Open()
            MessageBox.Show("Connection to Database has been opened.")
        Catch myerror As MySqlException
            MessageBox.Show("Cannot connect to database: " & myerror.Message)
        End Try
        Dim myadapter As New MySqlDataAdapter
        Dim sqlquary = "SELECT * FROM user WHERE username = '" & UsernameTextBox.Text & "' AND password = '" & PasswordTextBox.Text & "';"
        Dim command As New MySqlCommand
        command.Connection = MySqlConnection
        command.CommandText = sqlquary
        myadapter.SelectCommand = command
        Dim mydata As MySqlDataReader
        mydata = command.ExecuteReader()
        If mydata.HasRows = 0 Then
            MsgBox("ผิดพลาด", MsgBoxStyle.Exclamation)
        Else
            MsgBox("ถูกต้อง", MsgBoxStyle.Information)
        End If
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class