how to enter the characters one by one in a text box

[satyanarayana]

Hi ,

I have a applicaiton whcih is having one text box. i want  to enter text inside that text box character by character. on entering text one search button will be enable. here i am able to enter the characters but that button is not enabling. it is enabling on keyboard input.

How to enter the keyboard into perticular textbox.

Thanks
satyanarayana