move cursor position

Question

Hi all
in side one TextBox we can move the blinking cursor to the right by using arrow right key.

my question is how to move the cursor to the right character using code.

For example inside TextBox1 there is a word "London", and the blinking cursor is at the
right side of "L" character.(the program is in running state.)
Button1 is the button which is when clicked ,will do something which move the blinking
cursor one character to the right  (to the right side of  first "o" character.)

regard
han