Controlling cycles of timers/panel color changes in code at starting click event

      Private counter1 As Integer = 0, counter2 As Integer = 0, counter3 As Integer = 0, counter4 As Integer = 0, counter5 As Integer = 0, counter6 As Integer = 0, _
            counter7 As Integer = 0
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            'Set Interval of All the Timers 
            timer1.Interval = 1000
            timer2.Interval = 2000
            timer3.Interval = 1500
            timer4.Interval = 500
            timer5.Interval = 700
            timer6.Interval = 300
            timer7.Interval = 3000
        End Sub
        
        Private Sub timer1_Tick(ByVal sender As Object, ByVal e As EventArgs)
            'Change the Color of Panel and Count the iteration
            panel1.BackColor = Color.Red
            counter1 += 1
        End Sub
        
        Private Sub timer2_Tick(ByVal sender As Object, ByVal e As EventArgs)
            panel1.BackColor = Color.Green
            counter2 += 1
        End Sub
        
        Private Sub timer3_Tick(ByVal sender As Object, ByVal e As EventArgs)
            panel1.BackColor = Color.Blue
            counter3 += 1
        End Sub
        
        Private Sub timer4_Tick(ByVal sender As Object, ByVal e As EventArgs)
            panel1.BackColor = Color.Yellow
            counter4 += 1
        End Sub
        
        Private Sub timer5_Tick(ByVal sender As Object, ByVal e As EventArgs)
            panel1.BackColor = Color.Violet
            counter5 += 1
        End Sub
        
        Private Sub timer6_Tick(ByVal sender As Object, ByVal e As EventArgs)
            panel1.BackColor = Color.Wheat
                
            counter6 += 1
        End Sub
        
        Private Sub timer7_Tick(ByVal sender As Object, ByVal e As EventArgs)
            panel1.BackColor = Color.Transparent
            counter7 += 1
        End Sub
        
        Private Sub btnStart_Click(ByVal sender As Object, ByVal e As EventArgs)
            'Start All timers At once 
            timer1.Enabled = True
            timer2.Enabled = True
            timer3.Enabled = True
            timer4.Enabled = True
            timer5.Enabled = True
            timer6.Enabled = True
            timer7.Enabled = True
        End Sub
        
        Private Sub btnStop_Click(ByVal sender As Object, ByVal e As EventArgs)
            'Stop the timer On CLicing Stop Button
            
            timer1.Enabled = False
            timer2.Enabled = False
            timer3.Enabled = False
            timer4.Enabled = False
            timer5.Enabled = False
            timer6.Enabled = False
            timer7.Enabled = False    
        
            'Show Number of Count on Timer Stop
            label1.Text = "Timer 1:" & counter1.ToString()
            label2.Text = "Timer 2:" & counter2.ToString()
            label3.Text = "Timer 3:" & counter3.ToString()
            label4.Text = "Timer 4:" & counter4.ToString()
            label5.Text = "Timer 5:" & counter5.ToString()
            label6.Text = "Timer 6:" & counter6.ToString()
            label7.Text = "Timer 7:" & counter7.ToString()
        End Sub