Apex Class:

public class sampleExtension {
  ApexPages.standardController std = null;
  public sampleExtension(ApexPages.standardController sc)  {
    std = sc;
  }
  public PageReference doCancel()  {
    return std.cancel();
  }
}
VisualForce Page:
Note: this doesn’t necessarily take you to the list view, it’ll return you to the last page you were viewing before going to the VF page.
Reference: 

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Salesforce MVP | Lightning Champion | 16x Salesforce Certified | Application Architect | 6x Trailhead Ranger | Techforce Services | Australia

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