public int UpdateTargetFramework(IVsHierarchy pHier, string currentTargetFramework, string newTargetFramework) { FrameworkName moniker = new FrameworkName(newTargetFramework); SetProjectProperty("TargetFrameworkIdentifier", moniker.Identifier); SetProjectProperty("TargetFrameworkVersion", "v" + moniker.Version); SetProjectProperty("TargetFrameworkProfile", moniker.Profile); return VSConstants.S_OK; }