Question about controller[SOLVED]

[eluser]Hitesh Chavda[/eluser]
Hi

I have little question about controller in CI

I have function some like below in main controller

Code:

function check_user_name()
{

     //code

}

now when i type http://localhost/check_user_name/ it execute, I know the work of controller but how to block only that function to behave only like function rather than url.

I know this type of functions should actually write in Models but now I can't move it.