C# webbrowser change input type

There is anyway to change input type. I am using windows form can do so many things like change value or other things but changing input type never work. I find the element by name but this input got hidden type and i want to click on it because other button is image which cannot be clicked.

https://www.w3schools.com/jsref/met_element_setattribute.asp In java works well. Dunno why not working with c#