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 form? I've tried Alt+0 but it does not work.

I know I can do it in a GET request by using "%00" in the URL. However, I want to do it in a form POST.

user_12586945 · Answer

my suggestion would be to write the null character to an html element you would like it in ex:

    document.getElementByID("my_null_tag").innerHTML += "\0"