How can I execute the current line as Vim EX comma

Question

Say I'm editing my _vimrc file and I've just added a couple of lines, for instance a new key mapping. I don't want to reload the whole file (:so %) since that will reset a lot of temporary stuff I'm experimenting with. I just want to run the two lines that I'm currently working on.

I'm having no luck trying to copy/paste the lines into the command buffer, since I can't use the put command in there. Is there any way I could run the current line (or current selection) as EX commands?

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Summary:

After Anton Kovalenko's answer and Peter Rincker's comment I ended up with these key maps, which either executes the current line, or the current selected lines if in visual mode:

" Execute current line or current selection as Vim EX commands.
nnoremap <F2> :exe getline(".")<CR>
vnoremap <F2> :<C-w>exe join(getline("'<","'>"),'<Bar>')<CR>

Answer 1

Just after posting this, I found a work-around. I can copy text into the clipboard using "*y, then put that text into the command buffer by using the middle mouse button. This works for me, but is hardly a convenient solution for people without clipboard support, mouse support or just an aversion to removing their hands from the Vim position.