help in caesar cipher coding

hello there!!!
I have been assign 2 do a simple Caesar Shift cipher in visual basic where the user input the text or sentences and encrypt it. i have been trying these coding below and it still shows errors! CAN ANYONE help me by telling me what wrong with the coding!
///////////////////
'MAIN FORM
Option Explicit
Private Tcrypto As New Ecrypto

Private Sub cmdEncode_Click()
Dim tmpoutput As String

AssignProperties
txtEncode = Tcrypto.EncodeCeasar

End Sub

Private Sub AssignProperties()

Tcrypto.lb1 = "kethieswaran" 'Val(txtMain.text)
Tcrypto.lb2 = "d" 'Val(txtK1.text)

End Sub

Private Sub Form_Load()

End Sub

'Class Module
Option Explicit

Private Ttxtlb1 As String
Private Ttxtlb2 As String

Public Function EncodeCeasar() As String

'encode
Dim i As Long
Dim plainC As Integer
Dim codeC As Integer
Dim shiftC As Integer

'trim
Ttxtlb1 = TrimText(Ttxtlb1, True, False, False, False)
If Ttxtlb1 = "" Then MsgBox " **** me", vbCritical
Exit Function

shiftC = Asc(Ttxtlb2) - 65

'encode2
For i = 1 To Len(Ttxtlb1)
plainC = Asc(Mid(Ttxtlb1, i, 12)) - 64
If codeC > 26 Then codeC = codeC - 26
EncodeCeasar = EncodeCeasar & Chr(codeC + 64)
Next i

End Function

Public Function TrimText(TextIn As String, Letters As Boolean, Numbers As Boolean, Spaces As Boolean, Points As Boolean)
'trim a strings letters, numbers, spaces or points
Dim i As Long
Dim tmp As Byte
For i = 1 To Len(TextIn)
tmp = Asc(UCase(Mid(TextIn, i, 1)))
If Letters = True And (tmp > 64 And tmp < 123) Then
TrimText = TrimText & Chr(tmp)
ElseIf Numbers = True And (tmp > 47 And tmp < 58) Then
TrimText = TrimText & Chr(tmp)
ElseIf Spaces = True And tmp = 32 Then
TrimText = TrimText & Chr(tmp)
ElseIf Points = True And tmp = 46 Then
TrimText = TrimText & Chr(tmp)
End If
Next
End Function

Public Property Get lb1() As String

lb1 = Ttxtlb1
' Ttxtlb1 = lb1
End Property

Public Property Let lb1(ByVal strlb1 As String)

Ttxtlb1 = strlb1
'lb1 = Ttxtlb1
End Property

Public Property Get lb2() As String
lb2 = Ttxtlb2
'Ttxtlb2 = lb2
End Property

Public Property Let lb2(ByVal strlb2 As String)

Ttxtlb2 = strlb2
'lb2 = Ttxtlb2
End Property

///////////////////
!!!!the input from the form is not passed to the class module!!!!
thank you