How to input a null character into a web form?

Question

I am testing an ASP.NET web form which needs to filter out null characters from input.

To test this functionality, how can I actually type a null character in the html f

Answer 1

I was able to do this using TamperData Firefox plugin.

https://addons.mozilla.org/en-US/firefox/addon/tamper-data/

When given the Tamper Popup I typed "%00" in the Post Parameter Value field.

Still, I cannot find a way to type a null character just using the keyboard.