部署网站时缺少using指令或程序集引用错误

Question

I have a website, where the *.cs file lies in the App_Code folder (while adding a class item in my project, VS2010 suggested me to create this folder). I have a default.aspx.cs file which makes use of this class. It runs without any error when I run on VS2010.

However, when I deployed the website on the webserver via a private hosting company. It gives me this error:

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: CS0246: The type or namespace name 'SMSAPP' could not be found (are you missing a using directive or an assembly reference?)

And its pointing to the line of code where I am instantiating the object of the class:

Line 84:         SMSAPP obj = new SMSAPP();

What exactly went wrong from the local version to the hosted version? Please help. Thanks.

What I learned:

Okay, so I haven't been able to run my project yet. But I learned few things which I would like to share- web applications and web sites are totally different things. Mine was a website, that's why the *.cs code's property did not have option to "Build Action" = "Compile". I converted my project from website to web application, and I could see the options being suggested in the answers here. However, no luck in the deployment.

Answer 1

Right mouse click on the .cs file and select properties then check if the "Build action" is set to "Compile"

Answer 2

Check your local App_Code folder, somewhere there you must have a class SMSAPP .

You must have forgotten to upload this file.

Answer 3

Check property of your *.cs files in App_Code. They should have Build Action as Compile

Answer 4

如果您的Web应用程序配置为使用正确的.NET版本，请检入IIS管理器