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

        public virtual int OpenItem(uint itemId, ref Guid logicalView, IntPtr punkDocDataExisting, out IVsWindowFrame frame)
        {
            // Init output params
            frame = null;

            HierarchyNode n = this.NodeFromItemId(itemId);
            if (n == null)
            {
                throw new ArgumentException(SR.GetString(SR.ParameterMustBeAValidItemId, CultureInfo.CurrentUICulture), "itemId");
            }

            // Delegate to the document manager object that knows how to open the item
            DocumentManager documentManager = n.GetDocumentManager();
            if (documentManager != null)
            {
                return documentManager.Open(ref logicalView, punkDocDataExisting, out frame, WindowFrameShowAction.DoNotShow);
            }

            // This node does not have an associated document manager and we must fail
            return VSConstants.E_FAIL;
        }