How Many Controls Are Required To Create A Windows Form Application

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VB

Hi All.
Say you are given a sample code of a VB.net code [to calculate MD5 Checksum]

Imports System.IO
    Imports System.Text
    Imports System.Diagnostics
    Imports System.Security.Cryptography
    
    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
    Dim stopwatch As New Stopwatch
    Dim md5 As String = ""
    stopwatch.Start()
    md5 = GetMD5Checksum("C:\windows\explorer.exe")
    stopwatch.Stop()
    MsgBox("MD5 Checksum [" + md5 + "]" & Environment.NewLine & _
    "Computed in " + stopwatch.Elapsed.ToString)
    End Sub 'Button1_Click

    Public Function GetMD5Checksum(ByVal filePath As String) As String
    Dim md5 As MD5CryptoServiceProvider = New MD5CryptoServiceProvider
    Dim fs As FileStream = New FileStream(filePath, FileMode.Open, _
    FileAccess.Read, FileShare.Read, 8192)
    fs = New FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 8192)
    md5.ComputeHash(fs)
    fs.Close()
    Dim hash As Byte() = md5.Hash
    Dim sb As StringBuilder =NewStringBuilder
    Dim hByte As Byte
    For Each hByte In hash
    sb.Append(String.Format _
    	 "{0:X2}", hByte))
    Next
    Return sb.ToString()
    End Function 'GetMD5Checksum

If we are given the codes and I just want to create a Windows Form Application, then how can I possibly guess how many controls are required i.e. buttons, textbox, OpenFileDialog, etc without missing an element? Is there any way to go about doing this reverse technique?

Many thanks,
Giggsey