Puzzle Game - Visual Studio 2010

PHP Code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  If (Button12.Text = "") Then
    Dim swap As String
    swap = Button11.Text
    Button11.Text = ""
    Button12.Text = swap
    Label1.Text = (Label1.Text) + 1
  ElseIf (Button10.Text = "") Then
    Dim swap As String
    swap = Button11.Text
    Button11.Text = ""
    Button10.Text = swap
    Label1.Text = (Label1.Text) + 1
  ElseIf (Button7.Text = "") Then
    Dim swap As String
    swap = Button11.Text
    Button11.Text = ""
    Button7.Text = swap
    Label1.Text = (Label1.Text) + 1
  End If
  If (Button2.Text = "1" And Button3.Text = "2" And Button4.Text = "3" And Button5.Text = "4" And Button6.Text = "5" And Button7.Text = "6" And Button8.Text = "7" And Button9.Text = "8" And Button10.Text = "9" And Button11.Text = "10" And Button12.Text = "11" And Button13.Text = "") Then
    MsgBox("Congratulation! You have won the game.", 0, "CONGRATULATION")
  End If
    End Sub

Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click, Me.Load
  Label1.Text = "0"
  Try
    Dim str() As String = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", ""}
    ShuffleArray(str)
    Button2.Text = str(0)
    Button3.Text = str(1)
    Button4.Text = str(2)
    Button5.Text = str(3)
    Button6.Text = str(4)
    Button7.Text = str(5)
    Button8.Text = str(6)
    Button9.Text = str(7)
    Button10.Text = str(8)
    Button11.Text = str(9)
    Button12.Text = str(10)
    Button13.Text = str(11)
  Catch ex As Exception

  End Try
    End Sub
    Public Shared Sub ShuffleArray(ByRef Array() As String)
  Dim Rand As Random = New Random()
  For x As Integer = 0 To Array.Length - 1
    Dim TempIndex As Integer = Rand.Next(Array.Length)
    Dim TempValue As String = Array(TempIndex)
    Array(TempIndex) = Array(x)
    Array(x) = TempValue
  Next
    End Sub