Use String Join in VB.Net - vb.net

Question

I have TxtGamblerImput.Text = 2 4 6 8 10 how should that work that code? how can use that code in that textbox?
TextBox4.Text = String.Join(" ", myFirstComb)
Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
'This your First Combination, maximal widht = element
Dim Content As String = TxtGamblerImput.Text
'This Your Element
Dim Element As Integer = 5
Dim myFirstComb = (From mVal In Content.ToString.Split() Select Convert.ToInt32(mVal)).ToArray
'This Your Result List
Dim MyList As New List(Of String)
Dim myM As Integer = myFirstComb.Length
Dim myPost = myM
For myCnt = myM To 1 Step -1
Dim LastStr = ""
For mycnt3 = 1 To Element
For myCnt2 = myCnt To myM
'If myCnt2 = myM Then MsgBox("T")
Dim myVal = myFirstComb(myCnt2 - 1)
If myVal > Element Then myVal = 1
If Element - myM + myCnt2 = myVal Then
myFirstComb(myCnt2 - 1) = myVal
Else
If (myVal + 1) > Element Then myVal = 0
myFirstComb(myCnt2 - 1) = myVal + 1
End If
Next
Dim Hsl = String.Join(" ", myFirstComb)
If LastStr <> Hsl Then
MyList.Add(Hsl)
End If
LastStr = Hsl
Next
Next
myFirstComb = (From mVal In Content.ToString.Split() Select Convert.ToInt32(mVal))
TextBox4.Text = String.Join(" ", myFirstComb)
End Sub
In that Output: Show 2 4 6 8 10
I dind't work? How can use that code for worked?