Replacing multiple lines of text in a file

[PR0 6AM3R]

Sorry if this seems like I haven't searched, however I have. Maybe I'm not understanding something or maybe I just haven't found what I need. Anyway my question is this. How would I find multiple strings in a text file and replace them?

So far I've been able to find out how to replace a single string with:

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim MyFile() As String = System.IO.File.ReadAllLines(filePath)
        Dim MySW As New System.IO.StreamWriter(filePath, False)
        Using MySW
            For Each Line As String In MyFile
                MySW.WriteLine(Line.Replace("Example 1", "eExample 1e"))
            Next
        End Using
    End Sub
End Class

However I have no idea how to do it for multiple strings. If for example I do something like:

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim MyFile() As String = System.IO.File.ReadAllLines(filePath)
        Dim MySW As New System.IO.StreamWriter(filePath, False)
        Using MySW
            For Each Line As String In MyFile
                MySW.WriteLine(Line.Replace("Example 1", "eExample 1e"))
MySW.WriteLine(Line.Replace("Example 2", "eExample 2e"))
MySW.WriteLine(Line.Replace("Example 3", "eExample 3e"))
            Next
        End Using
    End Sub
End Class

It replaces everything as per needed however it multiplies the strings by 3 and doesn't replace the multiplied strings anyway. So, how would I go about finding various strings in a text file and replacing them instead of only being able to do it for one string?