timer and text alternation

hey guys so i made a timer that counts down from 15 to 0 ,
now i need a text displaying timer has finished on the aplication when
timer = "0" ,,, how to do? thanks

Declare module level variable and decrease it in Tick event and when it reach 0, display the message.
Something like this

vb Code:

Public Class Form1
    Private mintCounter As Integer
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        mintCounter = 15
        Timer1.Interval = 1000 ' one second
        Timer1.Enabled = True
    End Sub
 
    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        mintCounter -= 1
        Me.Text = mintCounter
        If mintCounter = 0 Then
            Timer1.Enabled = False
            MessageBox.Show("Timer has been finished")
        End If
    End Sub
End Class