Problem vs2012 textbox char edit

Hi, what I want to do is to edit every char in a txtbox for ex: txtbox1.text = "Rudi"

Now it must take the text length and count each step, when the char (thats being checked atm = R) then textbox2.text = textbox2.text + "1R1"

then it must go to the next char and "u" must = "1u1" and should be added to textbox 2

So when T1 = "Rudi is my name" then T2 should be = "1R11u11d11i1 1i11s1 1m11y1 1n11a11m11e1"

The point of this is so that i can use a secret code..and set each letter to a value..ex R = 1614641

I DON"T want the bit like 10101101

Please and thanks