In your Program.cs file, add the registration call before builder.Build() :
Syncfusion license keys are generated by logging into the user account and navigating to the "Downloads and Keys" section under "My Dashboard". Starting with version 31.1.17, a new edition-based model requires selecting specific software bundles rather than individual platforms. For more details, visit Syncfusion Help . How to generate License key for licensed products?
If you're using Syncfusion assemblies from NuGet.org without an account, register for a free Syncfusion account, start a 30‑day trial, and generate a trial license key from the Trial & Downloads section.
Go to the Syncfusion login page and sign into your account. syncfusion generate license key upd
Without a valid key, you’ll see a trial message reminder in your application. Here’s how to avoid that and stay compliant.
Here is a helpful report on managing and updating your Syncfusion License Key.
Click on My Dashboard in the top navigation bar. In your Program
Do not share your license key publicly. It is tied to your registered email and domain.
There are several scenarios where generating a license key update is necessary:
Syncfusion transitioned to a "license key" system to simplify the deployment process. Unlike older versions that required a local installer-based license, modern Syncfusion packages (available via NuGet) require a runtime string to be registered in your code. A license key is: A key for v21.x will not work for v22.x. How to generate License key for licensed products
Syncfusion’s introduction of the license key requirement was a direct response to this shift. Prior to version 16.1 (2018), developers could simply reference the DLLs in their projects, and the software would function without an explicit key check in the runtime. Post-16.1, Syncfusion integrated a licensing module directly into their assemblies. This meant that the "Generate License Key" workflow became not just a formality, but a technical prerequisite for compilation and runtime execution. This change forced developers to engage with the Syncfusion ecosystem more actively, tying the usage of the software directly to the validity of a specific license agreement.
When you search for you are essentially looking for instructions to generate a new key (for a new subscription or computer) and update (UPD) the old key in your existing projects.