How to display multiple checkbox value in textbox with comma

i have 15 checkboxes in vb6.0 form. i want to display selected checkbox value in sort order in single textbox. i have tried using below code but one issue is comma display after last value. i want to just display in which two value like 1,2 if selected value is only one like 1 then comma should not be display prefex or sufix. 

also value should be display in sort order like 1,4,7,8 etc.

kindly help me to solve this i have many tried but still not resolved and its urgent.

Sub cBoxSelection()
    Dim m As Integer
    m = Me.Controls.Count
    ReDim TheArray(m) As String 'Max size the array will be
    Dim cBoxes As Object, Index As Integer
     Index = 0
         For Each cBoxes In Me.Controls
          'Debug.Print TypeName(cBoxes), cBoxes.Value
            If TypeName(cBoxes) = "CheckBox" Then
             If cBoxes.Value = 1 Then
            TheArray(Index) = cBoxes.Caption
            Index = Index + 1
            End If
        End If
    Next
  ReDim Preserve TheArray(Index)  'Get rid of the empty spaces
      'SortArray TheArray
        Dim s As String
    s = Join(TheArray, ",")
    
        Me.Text2.Text = s
End Sub
Public Sub SortArray(ByRef TheArray As Variant)
    Dim Sorted As Boolean
    Sorted = True
    Do While Not Sorted
        Sorted = True
        Dim X As Long, Temp As Variant
        For X = 0 To UBound(TheArray) + 1
            If TheArray(X) > TheArray(X + 1) Then
                Temp = TheArray(X + 1)
                TheArray(X - 1) = TheArray(X)
                TheArray(X) = Temp
                Sorted = True
            End If
        Next X
    Loop
End Sub