Find the following line in your web.config file : <httpRuntime maxRequestLength=”2097151″ waitChangeNotification=”1″ maxWaitChangeNotification=”3600″ /> Change it to: <httpRuntime requestValidationMode=”2.0″ maxRequestLength=”2097151″ waitChangeNotification=”1″ maxWaitChangeNotification=”3600″ /> Request Validation Mode property gets or sets a version number that indicates which ASP.NET version-specific approach to validation will be used. Let me know if it works for you..!!