how to highlight array text and show in textbox

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VB

CKEditor

i want to compare two text file form 2 textbox and i success to compare it but problem that i face now is unable to highlight the different of two text file...

ps : i extended CKEditor to use as my textbox

Below is my coding for compare 2 text file

Protected Sub btnCompare_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnCompare.Click
    Dim txt1(CKEditor1.Text.Split(" ").Length) As String
    Dim txt2(CKEditor2.Text.Split(" ").Length) As String

    txt1 = CKEditor1.Text.Split(" ")
    txt2 = CKEditor2.Text.Split(" ")
    If txt2.Length <> txt1.Length Then
        lblMessage.Visible = True
        lblMessage.Text = "Please Insert Same Type File"
    Else
        Dim same As String = ""

        For i = 0 To txt2.Length - 1

            If txt2(i) <> txt1(i) Then
                same += txt1(i) & "(" & txt2(i) & ") "

            Else

                txt2(i) = txt1(i)
                same += txt1(i).ToString & " "

            End If

        Next i

        CKEditor3.Text = same.ToString

    End If


End Sub

is that any idea how to do this?

Thx