Hi Guys, for example, i have a public function add(x,y) in class math.vb in app_code folder. how would i use this function in other aspx pages? coz i don't see it in intellisense and i need to declare an instance of class math.vb like dim m as math and then use the function m.add(x,y). it works fine for me but when i deploy the project to server it gives an error that math.vb is not defined. actual class and error is shown below, is there another method or workaround for this: Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: BC30002: Type 'aSMSCenter.SMSCenter' is not defined.Source Error: