# Building a Modern Track Changes Review Workflow in ASP.NET Core C# > In this article, we will explore how to build a modern track changes review workflow in ASP.NET Core C#. We will leverage the powerful features of TX Text Control .NET Server to create an efficient and user-friendly review process for document editing. - **Author:** Bjoern Meyer - **Published:** 2026-04-28 - **Modified:** 2026-04-28 - **Description:** In this article, we will explore how to build a modern track changes review workflow in ASP.NET Core C#. We will leverage the powerful features of TX Text Control .NET Server to create an efficient and user-friendly review process for document editing. - **12 min read** (2381 words) - **Tags:** - ASP.NET - ASP.NET Core - Track Changes - Review Workflow - **Web URL:** https://www.textcontrol.com/blog/2026/04/28/building-a-modern-track-changes-review-workflow-in-aspnet-core-csharp/ - **LLMs URL:** https://www.textcontrol.com/blog/2026/04/28/building-a-modern-track-changes-review-workflow-in-aspnet-core-csharp/llms.txt - **LLMs-Full URL:** https://www.textcontrol.com/blog/2026/04/28/building-a-modern-track-changes-review-workflow-in-aspnet-core-csharp/llms-full.txt - **GitHub Repository:** https://github.com/TextControl/TXTextControl.TrackChanges.Review --- Documents are not finalized after being written just once. They evolve through collaboration, negotiation, and continuous refinement. This is where tracked changes become essential. Tracked changes transform edits into structured, reviewable data. Each insertion and deletion is recorded along with the necessary context: Who made the change, what changed, and when. This transforms a document from static content into transparent data. In many business scenarios, editing is about more than just improving wording or fixing typos. It's also about accountability, traceability, and controlled decision-making. In the legal domain, contracts are rarely written by one person. They pass through multiple stakeholders, including internal teams, external partners, and opposing parties. Each revision introduces changes that must be clearly visible and attributable. Without tracked changes, negotiations quickly become ambiguous. With tracked changes, however, every clause adjustment is transparent, and every decision to accept or reject a modification becomes part of a documented process. This is crucial for legal compliance, risk management, and maintaining a clear audit trail. The stakes are even higher in healthcare. Clinical procedures, internal policies, and patient-related documentation require strict governance. When a document is modified, it must be possible to determine exactly what was changed and why. Regulatory frameworks demand not only that revisions be visible, but also that they be historically traceable. Tracked changes provide this continuity and ensure that no modification is lost or hidden. Finance and insurance operate under similar constraints. Documents are often subject to compliance requirements that demand a clear audit trail. When policies, reports, or agreements are updated, organizations must demonstrate how those changes occurred over time. Tracked changes facilitate this without the need for external systems or manual tracking processes. The underlying requirement is the same across all these domains. Organizations need to have confidence in their documents. They must trust not only the final version but also the entire process that led to it. ### From Raw Changes to a Structured Review Workflow A modern review experience should not resemble scrolling through a document full of redlines. This approach works for small edits but quickly breaks down as documents become more complex and the number of contributors increases. A more effective approach is to treat tracked changes as structured data. This enables a layered experience in which users transition from a high-level overview to detailed decision-making. Instead of being overwhelmed by a sea of redlines, users can first see a summary of changes. They can then drill down into specific sections or individual edits to make informed decisions about accepting or rejecting them. #### Document Overview The first step to an efficient workflow is identifying where attention is required. Rather than opening documents individually, users are presented with a consolidated overview of files containing tracked changes. ![Tracked Changes Overview](https://s1-www.textcontrol.com/assets/dist/blog/2026/04/28/a/assets/tracked1.webp "Tracked Changes Overview") This overview provides immediate insight into the state of each document. By displaying the number of changes, the most recent activity, and the list of contributing authors, it becomes clear which documents are actively being worked on and which ones are ready for review. The presence of multiple authors signals collaboration, and a high number of changes often indicates that a document requires careful inspection. This approach eliminates guesswork. Users no longer need to open documents just to check for changes. The system surfaces that information upfront and allows for prioritization based on real data. #### Detailed Change Review Once a document is selected, the focus shifts from the document itself to the specific changes within it. This is where the program's functionality becomes significantly more powerful than that of traditional document editors. ![Detailed Change Review](https://s1-www.textcontrol.com/assets/dist/blog/2026/04/28/a/assets/tracked2.webp "Detailed Change Review") Each tracked change is presented as a structured entry with its associated metadata. Rather than visually scanning through paragraphs, users can systematically work through a list of changes. This is especially valuable in large documents where changes may be scattered across multiple sections. Filtering and sorting capabilities allow users to narrow down the view to specific authors or types of changes. For instance, a reviewer could focus solely on deletions to grasp what content is being removed or isolate changes from a particular contributor. This level of control is impossible when working directly in a document view. Decision-making is also streamlined. Each change can be accepted or rejected individually, and multiple changes can be processed in bulk. These features reduce the time required for review and make the workflow scalable, even for documents with dozens or hundreds of edits. #### Visual Preview of Changes Although structured data is powerful, context is still essential. On its own, a piece of text does not always convey how it fits into the document. ![Visual Preview of Changes](https://s1-www.textcontrol.com/assets/dist/blog/2026/04/28/a/assets/tracked3.webp "Visual Preview of Changes") To address this issue, a visual preview showing the location of each change within the document is provided. Rather than manually navigating to find the affected section, users can instantly see where the change occurs and how it interacts with the surrounding content. The ability to switch between a focused snippet and a full-page view ensures both precision and context. Reviewers can quickly validate whether a change makes sense without losing track of the document's overall structure. ![Focused Snippet vs Full-Page View](https://s1-www.textcontrol.com/assets/dist/blog/2026/04/28/a/assets/tracked4.webp "Focused Snippet vs Full-Page View") This combination of structured data and visual context creates a much more efficient review experience. #### Making Collaboration Visible: Author Activity Heatmaps Collaboration is often hidden within documents. Although tracked changes reveal who made specific edits, they do not easily show patterns of activity over time. ![Author Activity Heatmap](https://s1-www.textcontrol.com/assets/dist/blog/2026/04/28/a/assets/tracked5.webp "Author Activity Heatmap") An author activity heatmap fills this gap by displaying contributions in a time-based grid. Each author is represented across a timeline, and the intensity of their activity is reflected through color variations. This makes it immediately clear when each author was most active and how their level of involvement compares to that of other authors. This type of visualization introduces a new layer of understanding. Reviewers can quickly identify key contributors, recognize periods of intense editing, and detect collaboration dynamics that would otherwise remain invisible. In complex projects, it can even help explain why certain sections of a document evolved the way they did. Instead of being a purely decorative element, the heat map becomes a practical tool for analyzing a document's history. ### How TX Text Control Powers the Workflow TX Text Control .NET Server is at the core of this approach, providing a robust and reliable way to process Word documents on a server. Handling documents on the server ensures consistent behavior across environments. There is no dependency on client-side installations, and the DOCX format's full capabilities remain available. #### Loading and Accessing Document Data Documents are loaded directly in their native format, which preserves all tracked changes and metadata. This enables you to work with the document exactly as it was created without conversion or loss of information. ``` using var textControl = new ServerTextControl(); textControl.Create(); textControl.Load(filePath, StreamType.WordprocessingML); var trackedChanges = textControl.TrackedChanges .Cast() .Select(change => new TrackedChangeModel { ChangeNumber = change.Number, Author = NormalizeAuthor(change.UserName), ChangeKind = change.ChangeKind.ToString(), Text = string.IsNullOrWhiteSpace(change.Text) ? "(no text)" : change.Text.Trim(), TimeStamp = change.ChangeTime }) .OrderByDescending(change => change.TimeStamp) .ToList(); return new DocumentReviewModel { FileName = Path.GetFileName(filePath), TrackedChanges = trackedChanges }; ``` Once loaded, tracked changes can be accessed as structured objects. Each change includes detailed information, such as the author, type of modification, affected text, and exact timestamp. This transforms a visual feature into a rich data source that can drive the entire review interface. #### Applying Review Decisions Changes are accepted or rejected programmatically. This ensures that decisions made in the user interface are reflected directly in the underlying document. ``` using var textControl = new ServerTextControl(); textControl.Create(); textControl.Load(pathResult.FullPath!, StreamType.WordprocessingML); var selectedNumbers = changeNumbers.Distinct().ToHashSet(); var selectedChangeNumbers = textControl.TrackedChanges .Cast() .Where(change => selectedNumbers.Contains(change.Number)) .Select(change => change.Number) .OrderByDescending(number => number) .ToList(); var appliedCount = 0; foreach (var changeNumber in selectedChangeNumbers) { var trackedChange = textControl.TrackedChanges .Cast() .FirstOrDefault(change => change.Number == changeNumber); if (trackedChange is null) { continue; } textControl.TrackedChanges.Remove(trackedChange, acceptChanges); appliedCount++; } textControl.Save(pathResult.FullPath!, StreamType.WordprocessingML); ``` Since these operations are performed on the server, they can be integrated into larger workflows. For instance, these decisions can be logged, combined with approval processes, or linked to user authentication systems. The result is a controlled, extensible review pipeline. After processing, documents are saved as DOCX files, which maintains full compatibility with standard tools, such as Microsoft Word. #### Generating High-Quality Previews One innovative aspect of this approach is generating visual previews using SVG. Rather than relying on static images, the document is rendered dynamically and specific regions are extracted to highlight relevant changes. ``` using var textControl = new ServerTextControl(); textControl.Create(); textControl.Load(pathResult.FullPath!, StreamType.WordprocessingML); var trackedChange = textControl.TrackedChanges .Cast() .FirstOrDefault(change => change.Number == changeNumber); if (trackedChange is null) { return NotFound(); } var (fullSvgBase64, focusedSvgBase64) = BuildPreviewSvgs(textControl, trackedChange); return Json(new { fullSvgBase64, focusedSvgBase64, author = NormalizeAuthor(trackedChange.UserName), timeStamp = trackedChange.ChangeTime }); ``` This method offers several advantages. The previews are resolution-independent, ensuring they appear sharp on any display. They are also lightweight and load quickly, which is critical for responsive web applications. Most importantly, the previews accurately reflect the layout of the document, preserving the context that reviewers need. ### A Modern UI for Document Review An effective user interface is crucial for this workflow. A clean, structured design allows users to focus on reviewing content instead of navigating complexity. The document dashboard offers a clear entry point by presenting only relevant information. The review interface transforms tracked changes into a manageable dataset, making it easy to process large volumes of edits. Integrating visual previews and activity heatmaps adds depth without overwhelming users. The result is an experience that feels familiar to modern developers and knowledge workers. It borrows concepts from tools like code review systems and applies them to document workflows, resulting in a more intuitive and efficient process. ### Final Thoughts Tracked changes are more than just a convenient feature. They are a foundational element of collaborative document workflows, particularly in industries where accuracy and accountability are paramount. Combining structured change data with a modern, web-based interface transforms the way documents are reviewed. The result is a system that is faster, clearer, and better aligned with today's application needs. TX Text Control provides developers with the tools to build this kind of experience while maintaining full compatibility with standard Word documents. This allows users to modernize document workflows without disrupting existing processes and brings the benefits of structured review and advanced visualization into everyday use. ### Frequently Asked Questions Why are tracked changes important in business documents? --------------------------------------------------------- Tracked changes make document edits **auditable, attributable, and reviewable**. Each insertion and deletion records who made the change, what was changed, and when it happened. This turns a document from static content into transparent, structured data. Why are tracked changes important in legal workflows? ------------------------------------------------------ Legal documents often pass through multiple stakeholders during negotiation. Tracked changes make every clause adjustment visible and attributable, helping legal teams maintain a clear audit trail, reduce ambiguity, and support formal accept or reject decisions. How do tracked changes support healthcare documentation? --------------------------------------------------------- Healthcare documents such as clinical procedures, internal policies, and patient-related documentation require strict governance. Tracked changes help ensure that modifications remain visible, historically traceable, and reviewable. How can tracked changes be used as structured data? ---------------------------------------------------- Instead of treating tracked changes only as redlines inside a document, they can be extracted as **structured objects**. Each change can include metadata such as author, change type, affected text, and timestamp, which can then drive a modern review interface. What is the benefit of a document overview for tracked changes? ---------------------------------------------------------------- A document overview helps users quickly identify which files require attention. By showing the number of changes, latest activity, and contributing authors, reviewers can prioritize documents without opening each file individually. How does a detailed change review improve the review process? -------------------------------------------------------------- A detailed change review presents each tracked change as a separate entry with its metadata. This allows reviewers to filter, sort, accept, or reject changes systematically instead of manually scanning through long documents. Can tracked changes be accepted or rejected programmatically? -------------------------------------------------------------- **Yes.** With TX Text Control .NET Server, tracked changes can be accepted or rejected programmatically. This allows review decisions made in a web interface to be applied directly to the underlying DOCX document. Why are visual previews useful in a tracked changes workflow? -------------------------------------------------------------- Visual previews provide context for each change. They show where a modification appears in the document and how it relates to surrounding content, helping reviewers make better decisions without manually navigating through the entire file. What is an author activity heatmap? ------------------------------------ An author activity heatmap visualizes document contributions over time. It shows when authors were active and how their level of involvement compares, making collaboration patterns easier to understand. How does TX Text Control .NET Server support tracked changes workflows? ------------------------------------------------------------------------ TX Text Control .NET Server can load DOCX documents, preserve tracked changes and metadata, expose changes as structured data, apply accept or reject decisions, and save the processed document back as a standard DOCX file. Why process tracked changes on the server? ------------------------------------------- Server-side processing ensures consistent behavior across environments and avoids dependencies on client-side installations. It also makes it easier to integrate document review into authentication, approval, logging, and compliance workflows. How are high-quality document previews generated? -------------------------------------------------- Document previews can be generated as SVG output. SVG previews are resolution-independent, lightweight, and accurately reflect the document layout, making them well suited for responsive web-based review applications. Does this workflow remain compatible with Microsoft Word? ---------------------------------------------------------- **Yes.** Documents are loaded and saved as DOCX files, which preserves compatibility with standard tools such as Microsoft Word while enabling a modern web-based review experience. What makes this approach different from traditional redline review? -------------------------------------------------------------------- Traditional redline review requires users to visually scan the document. A structured review workflow turns tracked changes into manageable data, adds filtering and bulk actions, and combines metadata with visual previews for a faster and clearer process. --- ## About Bjoern Meyer As CEO, Bjoern is the visionary behind our strategic direction and business development, bridging the gap between our customers and engineering teams. His deep passion for coding and web technologies drives the creation of innovative products. If you're at a tech conference, be sure to stop by our booth - you'll most likely meet Bjoern in person. With an advanced graduate degree (Dipl. Inf.) in Computer Science, specializing in AI, from the University of Bremen, Bjoern brings significant expertise to his role. 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