How to get value in the splitted string

How to get value in the splitted string

I have an example string which has been splitted using the symbol "\"
Dim a As String = "123\456\7890\"
Dim leftString = a.Substring(0, msg.IndexOf("\"))
TextBox1.Text = leftString
In textbox1 it show the number of "123" , and how can i get the number of
"456" and "7890"?