Australian with withdrawn charge travelling to canada

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Hi,

I am an Australian citizen and while I was in Canada on a working holiday visa in 2009 I was charged with an offence, however I completed "alternative measures" and the charge was withdrawn. I continued to work in Canada for a few more months and then departed Canada and continued travelling. I haven't been charged or convicted of any other crimes in Canada or anywhere else.

I am planning on visiting Canada in December 2012 for a month. Am I admissible or inadmissible? Will I be allowed into Canada?

Thanks