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Cannot open MSSQLSSQLEXPRESS service on computer'.'.

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What I have tried:

Dim myController As New System.ServiceProcess.ServiceController("SQL Server (SQLEXPRESS)")
Private Sub Service_status()
        If myController.Status = ServiceProcess.ServiceControllerStatus.Running Then
            TextBox1.Text = "Started"
        ElseIf myController.Status = ServiceProcess.ServiceControllerStatus.Stopped Then
            TextBox1.Text = "Stopped"
        End If
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
            Service_status()
        End Sub
Private Sub BtnStop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnStop.Click
        ProgressBar1.Value = 0
        Try
            myController.Stop()
        Catch ex As Exception
            MsgBox(ex.Message)
        Finally
            ProgressBar1.Value = 100
            myController.WaitForStatus(ServiceProcess.ServiceControllerStatus.Stopped) '//Add
            Service_status()
        End Try

End Sub
Private Sub BtnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnStart.Click
        ProgressBar1.Value = 0
        Try
            myController.Start()
        Catch ex As Exception
            MsgBox(ex.Message)
        Finally
            ProgressBar1.Value = 100
            myController.WaitForStatus(ServiceProcess.ServiceControllerStatus.Running) '//Add
            Service_status()
        End Try

End Sub