.Net Coding Challenge #2

[Modestep]

The code:

Spoiler (Click to View)

Code:

Imports System.IO
Imports System.Security.Cryptography
Imports System.Text
Public Class Form1


    Private Sub FButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FButton1.Click
        If OpenFileDialog1.ShowDialog(Me) = 1 Then
            txtFile1.Text = OpenFileDialog1.FileName
            Label3.Text = GetFileSize(txtFile1.Text).ToString & "kb"
        End If
    End Sub
    Private Function GetFileSize(ByVal MyFilePath As String) As Long
        Dim MyFile As New FileInfo(MyFilePath)
        Dim FileSize As Long = MyFile.Length
        Return FileSize
    End Function
    Private Sub FButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FButton2.Click
        If OpenFileDialog2.ShowDialog(Me) = 1 Then
            txtFile2.Text = OpenFileDialog2.FileName
            Label4.Text = GetFileSize(txtFile2.Text).ToString & "kb"
        End If
    End Sub
    Private Sub FButton3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FButton3.Click
        Me.Close()
    End Sub

    Private Sub FButton4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FButton4.Click
        Dim pipi As String = CalculateMD5(txtFile1.Text)
        Dim kaka As String = CalculateMD5(txtFile2.Text)
        If pipi = kaka Then
            MessageBox.Show("The 2 files are the same", "Yes!!")
        Else
            MessageBox.Show("Those are 2 different files", "Oh noes :(")
        End If

    End Sub
    Private Function CalculateMD5(ByVal strFilepath As String) As String
        Dim File() As Byte = System.IO.File.ReadAllBytes(strFilepath)
        Dim Md5 As New MD5CryptoServiceProvider()
        Dim byteHash() As Byte = Md5.ComputeHash(File)
        Return ByteArrayToString(byteHash)
    End Function
    Private Function ByteArrayToString(ByVal arrInput() As Byte) As String

        Dim sb As New System.Text.StringBuilder(arrInput.Length * 2)

        For i As Integer = 0 To arrInput.Length - 1
            sb.Append(arrInput(i).ToString("X2"))
        Next

        Return sb.ToString().ToLower

    End Function
End Class

The download link: http://7019.a.hostable.me/CheckMD5.exe
And an image: