Show error! Cannot open MSSQLSSQLEXPRESS service on computer'.'. Please help

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VB

Visual-Studio

, +

Cannot open MSSQLSSQLEXPRESS service on computer'.'.

What I have tried:

Dim myController As New System.ServiceProcess.ServiceController("SQL Server (SQLEXPRESS)")

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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

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Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Service_status()
    End Sub

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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

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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