VB.NET Connecting

Imports MySql.Data.MySqlClient
Public Class Form1
    Dim ketnoi As New MySqlConnection("datasource=localhost;port=3306;username=root;password=")
    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
        Try
            '   connection.Open()
            ketnoi.Open()
            Label1.Text = "connected"

        Catch ex As Exception
            MessageBox.Show(ex.ToString())
        End Try
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Try
            ketnoi.Close()
            Label1.Text = "not connected"
        Catch ex As Exception
            MessageBox.Show(ex.ToString())
        End Try
    End Sub
End Class