Probably, you can't - or at least not in a really useful way.
You may be able to change it by altering the CommandTimeout property of the SqlComamnd:
https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396[
^]
But...if your command is timing out, then you probably need to look at your query and work on improving that rather than giving it more time. Extending the timeout may allow it to finish (if your hosting service doesn't have it's own overriding limits, and some do) but if your page is unresponsive for a long time waiting for your SQL to finish processing, the user is likely to assume you are dead and go elsewhere...