<t>CTRL + M + O will collapse all.<br/>
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CTRL + M + L will expand all. (in VS 2013 - Toggle All outlining)<br/>
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CTRL + M + P will expand all and disable outlining.<br/>
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CTRL + M + M will collapse/expand the current section.<br/>
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CTRL + M + A will collapse all even in Html files.<br/>
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These controls are also in the context menu under Outlining.<br/>
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Right click in editor -> Outlining to find these controls.<br/>
(After disabling outlining, use same steps to enable outlining.)<br/>
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For outlining options: Go to Tools -> Options -> Text Editor -> C# -> Advanced -> Outlining for outlining options.</t>