# MailMerge: Working with Image Placeholders > The MailMerge class is able to merge form fields, merge fields and objects such as barcodes or images. This article shows how to use image placeholders and how to insert them programmatically. - **Author:** Bjoern Meyer - **Published:** 2022-12-22 - **Modified:** 2025-11-16 - **Description:** The MailMerge class is able to merge form fields, merge fields and objects such as barcodes or images. This article shows how to use image placeholders and how to insert them programmatically. - **8 min read** (1551 words) - **Tags:** - ASP.NET Core - ASP.NET - Images - MailMerge - JavaScript - **Web URL:** https://www.textcontrol.com/blog/2022/12/22/mailmerge-working-with-image-placeholders/ - **LLMs URL:** https://www.textcontrol.com/blog/2022/12/22/mailmerge-working-with-image-placeholders/llms.txt - **LLMs-Full URL:** https://www.textcontrol.com/blog/2022/12/22/mailmerge-working-with-image-placeholders/llms-full.txt --- The MailMerge engine is able to merge images in the same way like merge fields or form fields in a document template. Image placeholders are added at design-time and merged with data from files, databases or memory. ### Image Placeholders An image placeholder is basically an image that is added to a template with a given Name. The data column must contain either the binary image data as a byte array, an object of type System.Drawing.Image, a file name, a hex or Base64 encoded string. These options cover most typical image representations in databases. Merged images are scaled up or down to match the width of the placeholder image in the template. #### Adding Placeholders with UI To insert an image placeholder, a pre-designed RibbonBar can be used: ![Creating placeholders with TX Text Control](https://s1-www.textcontrol.com/assets/dist/blog/2022/12/22/b/assets/step1.webp "Creating placeholders with TX Text Control") After the placeholder has been added, the name of the object can be defined in the *Frame Formatting* ribbon tab. ![Creating placeholders with TX Text Control](https://s1-www.textcontrol.com/assets/dist/blog/2022/12/22/b/assets/step2.webp "Creating placeholders with TX Text Control") In case a data source is already loaded using the LoadDataFromJson method (MVC) or using the JavaScript method loadJsonData, the image name can be directly defined through the right-click context menu. ![Creating placeholders with TX Text Control](https://s1-www.textcontrol.com/assets/dist/blog/2022/12/22/b/assets/step3.webp "Creating placeholders with TX Text Control") #### Adding Placeholders Programmatically Image placeholders can be also inserted programmatically using the JavaScript API. A placeholder is nothing more than an image with a name that should match the data column in the used data source. The following code inserts an image placeholder at a character location with the name *image1*. ``` var imageData = "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"; TXTextControl.images.addInline(imageData, -1, function(image) { if (image != undefined) { image.setName("image1"); } }) ``` ![Creating placeholders with TX Text Control](https://s1-www.textcontrol.com/assets/dist/blog/2022/12/22/b/assets/step4.webp "Creating placeholders with TX Text Control") ### Merging Placeholders Image placeholders are merged automatically when calling one of the *Merge* methods of *MailMerge*. The following simple JSON data source is used in the following example: ``` [ { "image1" : "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" } ] ``` The image data is part of the data source as a base64 encoded string. The following code uses the *MailMerge* method to merge the image data into the placeholder: ``` using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) { tx.Create(); tx.Load("template.tx", TXTextControl.StreamType.InternalUnicodeFormat); using (TXTextControl.DocumentServer.MailMerge mailMerge = new TXTextControl.DocumentServer.MailMerge()) { mailMerge.TextComponent = tx; var jsonData = System.IO.File.ReadAllText("data.json"); mailMerge.MergeJsonData(jsonData); } } ``` #### Image References Images can be also merged from file paths. The following data source contains an image file name: ``` [ { "image1" : "result.png" } ] ``` In this case, the *MailMerge* class expects this image as a physical file at the location defined through the SearchPath property. ``` using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) { tx.Create(); tx.Load("template.tx", TXTextControl.StreamType.InternalUnicodeFormat); using (TXTextControl.DocumentServer.MailMerge mailMerge = new TXTextControl.DocumentServer.MailMerge()) { mailMerge.TextComponent = tx; mailMerge.SearchPath = Application.StartupPath; var jsonData = System.IO.File.ReadAllText("data.json"); mailMerge.MergeJsonData(jsonData); } } ``` #### Removing Empty Images In case the data source doesn't contain an image with the given name in the template, the placeholder is maintained by default. To remove empty image placeholders, the RemoveEmptyImages property can be set to *true*. ``` mailMerge.RemoveEmptyImages = true; ``` ### Positioning and Object Size The positioning and the insertion mode of the image placeholder is maintained during the merge process. If the destination image width is larger or smaller, the width is adjusted based on the width of the placeholder image. --- ## 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. In his spare time, Bjoern enjoys running, paragliding, mountain biking, and playing the piano. - [LinkedIn](https://www.linkedin.com/in/bjoernmeyer/) - [X](https://x.com/txbjoern) - [GitHub](https://github.com/bjoerntx) --- ## Related Posts - [Build a Custom Backstage View in ASP.NET Core with TX Text Control](https://www.textcontrol.com/blog/2026/02/17/build-a-custom-backstage-view-in-aspnet-core-with-tx-text-control/llms.txt) - [5 Document Workflows You Can Automate With JavaScript Rich Text Editor](https://www.textcontrol.com/blog/2026/01/14/five-document-workflows-you-can-automate-with-javascript-rich-text-editor/llms.txt) - [Add JavaScript to PDFs with TX Text Control in C# .NET: Time-Based Alerts Made Easy](https://www.textcontrol.com/blog/2025/06/13/add-javascript-to-pdfs-with-tx-text-control-in-c-dot-net-time-based-alerts-made-easy/llms.txt) - [Use MailMerge in .NET on Linux to Generate Pixel-Perfect PDFs from DOCX Templates](https://www.textcontrol.com/blog/2025/05/27/use-mailmerge-in-dotnet-on-linux-to-generate-pixel-perfect-pdfs-from-docx-templates/llms.txt) - 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