Microsoft Dynamics CRM 2011 - Something about plugins SharedVariables

Microsoft Dynamics CRM 2011 - Something about plugins SharedVariables

My SharedVariables problem 
I had 2 plugins:
1) Pre Validation (code: 10)
2) Post Operation (code: 40)
After adding new value to SharedVariables in PreValidation, I've failed getting it in the PostOperation.

Solution:
I've found this article which explains the subject very well and helped me with my issue:
http://thomasthankachan.com/2011/08/12/pass-data-between-plug-ins-using-sharedvariables/

Summary:
PreValidation and PostOperation are running under different pipelines, and you should get SharedVariables from the parent context in PostOperation plugin and not it's own context.

MyCode:


bool isUpdate = true;
if(context.SharedVariables.Contains("SkipPlugin") && ((bool) context.SharedVariables["SkipPlugin"]))
{
  isUpdate = false;
} else if(context.ParentContext != null && context.ParentContext.SharedVariables.Contains("SkipPlugin") && ((bool) context.ParentContext.SharedVariables["SkipPlugin"])) {
  isUpdate = false;
}