hi jax
if it is a textbox that you want to inforce focus in certain postion on
then you can do it this way ...
first , use the select method get the postion where you want to
set the focus
eg: this.textBox1.Select(2,3); // this
will select 3 characters from the textbox starting the 2 index character
then you set the focus to the text box
eg:this.textBox1.Focus();// set the focus
"to the selected characters" inside the textbox
hope this answer your question