Why Does My ASP.NET Web Forms App Throw a System.MissingMethodException Despite the Method Existing?

Troubleshooting the Elusive "System.MissingMethodException" in ASP.NET Web Forms

Your seemingly functional ASP.NET Web Forms application is now unexpectedly throwing a System.MissingMethodException. Even though the DoThis method exists within the correct class, calling it from your generic handler produces this frustrating error.

This issue often stems from outdated DLLs stubbornly clinging to your system. Even after rebuilding and redeploying your project, older assemblies might remain.

The solution involves a complete cleanup: remove all compiled files, including DLLs and their associated XML files. After this thorough purge, rebuild and redeploy your entire solution.

This process ensures your application uses only the most up-to-date assemblies, effectively resolving the System.MissingMethodException.

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