Visual Studio Expand/Collapse keyboard shortcuts

Collapse to definitions

CTRL + M + O

Expand all outlining

CTRL + M + X

Expand or collapse everything

CTRL + M + L



 comment on web.config?

(1)    you can use

    <--! comment line -->

(2) u just select the line which you want to comment and press

    ctl K + C combination to comment that line...

    to  uncomment ctl K + U combination is used.