Display Leap Year 1900 To 2023 Using List Box in Visual Basic NET

A program that I wrote using Microsoft Visual Basic NET to display leap years from 1900 To 2023 Using List Box.

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Program Listing

Public Class Form1

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim startYear As Integer = 1900
    Dim endYear As Integer = 2023

    For y As Integer = startYear To endYear
        If Date.IsLeapYear(y) Then
            Dim x As Integer
            For x = y To endYear Step 4
                If Not Date.IsLeapYear(x) Then Exit For
                ListBox1.Items.Add(x)
            Next
            If x = endYear Then
                Exit For
            Else
                y = x
            End If
        End If
    Next
End Sub

End Class