Remove text

Question

I want to remove the text when I type same text in textbox (like remembered password).

 

Eg. At first ,  I run the program and type "111" in textbox1. Then I stop debugging and run the program again. In textbox1 , there is data if I type start with '1' and the textbox will drop down the my previous text "111".

Now I do not want to display 111 and remove this.

 

Can anybody help me in my problem.

Thanks a lot :-)