Why Does My ASP.NET WebForms App Throw a 'System.MissingMethodException: Method Not Found' Error After Recompilation?

Debugging System.MissingMethodException in ASP.NET WebForms

Encountering "System.MissingMethodException: Method not found" in a previously functional ASP.NET WebForms application signifies that a method, despite existing, is inaccessible. This often occurs even when the method remains within its class.

Root Cause:

The problem usually stems from outdated DLLs overriding the correct method. Recompilation with these older DLLs present can lead to conflicts and the "Method not found" exception.

Resolution:

Follow these steps to resolve the issue:

• Eliminate Obsolete DLLs: Completely remove all outdated DLLs related to your application from the deployment folder.
• Clear Temporary ASP.NET Files: Delete all temporary files within the App_Temporary directory located in the application's root.
• Rebuild and Redeploy: Perform a full solution rebuild and redeploy to your server. This guarantees the deployment of the latest assemblies and resolves conflicts with older versions.
• Single DLL Deployment: Confirm that only the newest version of the DLL containing the missing method is deployed. Multiple versions can cause assembly loading problems and the missing method error.

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