How do I fix: 🛑 Root Causes of the Error?

Using "Model" as the key will display all errors, not just the one for a specific property.

Coding⏱️ 1 min read📅 2026-06-03

How to Fix: ModelState.AddModelError - How can I add an error that isn't for a property?

Error not displayed in Html.ValidationSummary when adding error to ModelState for a non-existent property.

Quick Answer: {

📋 Table of Contents

To add an error that isn't for a property, you need to specify the key of the error in the ModelState.AddModelError method.

Using "Model" as the key will display all errors, not just the one for a specific property.

Step 1: Change the error message to include the property name, like this: ModelState.AddModelError(

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