Microsoft.VisualStudio.Project.ProjectNode.TransferItem C# (CSharp) Method

        public virtual int TransferItem(string oldMkDoc, string newMkDoc, IVsWindowFrame frame)
        {
            // Fail if hierarchy already closed
            if (this.ProjectMgr == null || this.ProjectMgr.IsClosed)
            {
                return VSConstants.E_FAIL;
            }
            //Fail if the document names passed are null.
            if (oldMkDoc == null || newMkDoc == null)
                return VSConstants.E_INVALIDARG;

            int hr = VSConstants.S_OK;
            VSDOCUMENTPRIORITY[] priority = new VSDOCUMENTPRIORITY[1];
            uint itemid = VSConstants.VSITEMID_NIL;
            uint cookie = 0;
            uint grfFlags = 0;

            IVsRunningDocumentTable pRdt = GetService(typeof(IVsRunningDocumentTable)) as IVsRunningDocumentTable;
            if (pRdt == null)
                return VSConstants.E_ABORT;

            string doc;
            int found;
            IVsHierarchy pHier;
            uint id, readLocks, editLocks;
            IntPtr docdataForCookiePtr = IntPtr.Zero;
            IntPtr docDataPtr = IntPtr.Zero;
            IntPtr hierPtr = IntPtr.Zero;

            // We get the document from the running doc table so that we can see if it is transient
            try
            {
                ErrorHandler.ThrowOnFailure(pRdt.FindAndLockDocument((uint)_VSRDTFLAGS.RDT_NoLock, oldMkDoc, out pHier, out id, out docdataForCookiePtr, out cookie));
            }
            finally
            {
                if (docdataForCookiePtr != IntPtr.Zero)
                    Marshal.Release(docdataForCookiePtr);
            }

            //Get the document info
            try
            {
                ErrorHandler.ThrowOnFailure(pRdt.GetDocumentInfo(cookie, out grfFlags, out readLocks, out editLocks, out doc, out pHier, out id, out docDataPtr));
            }
            finally
            {
                if (docDataPtr != IntPtr.Zero)
                    Marshal.Release(docDataPtr);
            }

            // Now see if the document is in the project. If not, we fail
            try
            {
                ErrorHandler.ThrowOnFailure(IsDocumentInProject(newMkDoc, out found, priority, out itemid));
                Debug.Assert(itemid != VSConstants.VSITEMID_NIL && itemid != VSConstants.VSITEMID_ROOT);
                hierPtr = Marshal.GetComInterfaceForObject(this, typeof(IVsUIHierarchy));
                // Now rename the document
                ErrorHandler.ThrowOnFailure(pRdt.RenameDocument(oldMkDoc, newMkDoc, hierPtr, itemid));
            }
            finally
            {
                if (hierPtr != IntPtr.Zero)
                    Marshal.Release(hierPtr);
            }

            //Change the caption if we are passed a window frame
            if (frame != null)
            {
                string caption = "%2";
                hr = frame.SetProperty((int)(__VSFPROPID.VSFPROPID_OwnerCaption), caption);
            }
            return hr;
        }