Versioning SharePoint 2010 Workflow In VS

1.Keep old version dll

　　a.Create a folder named as version1.0.0.0 in Bin

　　b.Copy existed workflow DLL from GAC(differnent between SP2010 and SP2013) to created folder

　　

2. Modify old version element file of workflow

　　<Workflow
     Name="PurchasingWorkflowTempalte1.0.0.0"
     Description="Purchasing Workflow Tempalte"
     Id="041b72c8-6491-4a3d-9272-03d09f50f6d9"
     CodeBesideClass="SP13.PurchasingWorkflow.PurchasingWorkflow.PurchasingWorkflow"
     CodeBesideAssembly="SP13.PurchasingWorkflow, Version=1.0.0.0, Culture=neutral, PublicKeyToken=fe0afbe7fc302259">  </Workflow>

3.Package the old version dll for old workflow

　　a.Add existing dll and specify the [Location],In [Location] you must add route path.

4.Add definition for new workflow

　　　a.Generate a new guid  for new workflow template.

　　<Workflow
     Name="PurchasingWorkflowTempalte2.0.0.0"
     Description="Purchasing Workflow Tempalte"
     Id="9B8AF2D0-6B36-4027-BAB9-53B5E0C54161"
     CodeBesideClass="Leoni.SP13.PurchasingWorkflow.PurchasingWorkflow.PurchasingWorkflow"
     CodeBesideAssembly="Leoni.SP13.PurchasingWorkflow, Version=2.0.0.0, Culture=neutral, PublicKeyToken=fe0afbe7fc302259" > </Workflow>

5.Modify assembly version and file version to 2.0.0.0 of the project.