Microsoft.VisualStudio.Project.FileNode.SetEditLabel C# (CSharp) Method

        public override int SetEditLabel(string label)
        {
            // IMPORTANT NOTE: This code will be called when a parent folder is renamed. As such, it is
            //                 expected that we can be called with a label which is the same as the current
            //                 label and this should not be considered a NO-OP.

            if(this.ProjectManager == null || this.ProjectManager.IsClosed)
            {
                return VSConstants.E_FAIL;
            }

            // Validate the filename.
            if(String.IsNullOrEmpty(label))
            {
                throw new InvalidOperationException(SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture));
            }
            else if(label.Length > NativeMethods.MAX_PATH)
            {
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.PathTooLong, CultureInfo.CurrentUICulture), label));
            }
            else if(Utilities.IsFileNameInvalid(label))
            {
                throw new InvalidOperationException(SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture));
            }

            for(HierarchyNode n = this.Parent.FirstChild; n != null; n = n.NextSibling)
            {
                if(n != this && String.Equals(n.Caption, label, StringComparison.OrdinalIgnoreCase))
                {
                    //A file or folder with the name '{0}' already exists on disk at this location. Please choose another name.
                    //If this file or folder does not appear in the Solution Explorer, then it is not currently part of your project. To view files which exist on disk, but are not in the project, select Show All Files from the Project menu.
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.FileOrFolderAlreadyExists, CultureInfo.CurrentUICulture), label));
                }
            }

            string fileName = Path.GetFileNameWithoutExtension(label);

            // If there is no filename or it starts with a leading dot issue an error message and quit.
            if(String.IsNullOrEmpty(fileName) || fileName[0] == '.')
            {
                throw new InvalidOperationException(SR.GetString(SR.FileNameCannotContainALeadingPeriod, CultureInfo.CurrentUICulture));
            }

            // Verify that the file extension is unchanged
            string strRelPath = Path.GetFileName(this.ItemNode.GetMetadata(ProjectFileConstants.Include));
            if(!String.Equals(Path.GetExtension(strRelPath), Path.GetExtension(label), StringComparison.OrdinalIgnoreCase))
            {
                // Prompt to confirm that they really want to change the extension of the file
                string message = SR.GetString(SR.ConfirmExtensionChange, CultureInfo.CurrentUICulture, new string[] { label });
                IVsUIShell shell = this.ProjectManager.Site.GetService(typeof(SVsUIShell)) as IVsUIShell;

                Debug.Assert(shell != null, "Could not get the ui shell from the project");
                if(shell == null)
                {
                    return VSConstants.E_FAIL;
                }

                if(!VsShellUtilities.PromptYesNo(message, null, OLEMSGICON.OLEMSGICON_INFO, shell))
                {
                    // The user cancelled the confirmation for changing the extension.
                    // Return S_OK in order not to show any extra dialog box
                    return VSConstants.S_OK;
                }
            }

            // Build the relative path by looking at folder names above us as one scenarios
            // where we get called is when a folder above us gets renamed (in which case our path is invalid)
            HierarchyNode parent = this.Parent;
            while(parent != null && (parent is FolderNode))
            {
                strRelPath = Path.Combine(parent.Caption, strRelPath);
                parent = parent.Parent;
            }

            return SetEditLabel(label, strRelPath);
        }