Hi Muhammad ,
1. You can get the current user and its roles by using UserManager class
2. If this is a content item you can create an additional metakey where you can set which role/user can see the content, so that you can easily retrieve the correct content by using GetMetaData method of IContent object.
You might find this post useful hiding controls beased on roles
control - this is the standard ASP.NET control. You can expose all public properties of the control in a custom control designer
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