MVC web application not recognizing custom class

Question

In my test MVC web application, I've created custom class, which retrieves data from database. I have created also another folder in MVC app called Data and i have placed that data class in this folder. When i want to use this class from Controller and when importing with:

using TestMvcApp.Data;

i get an error:

The type or namespace name 'Data' does not exist in the namespace 'TestMvcApp' 
(are you missing an assembly reference?)

Where can be the problem? Why it cannot find my class? I have tried a lot of things like placing that class in controller folder, but nothing helped yet. I created my test MVC app according to this article Using MvcContrib Grid in ASP.NET MVC Project Thanks for tips and answers.

EDIT: Name of my class is "ProductDB" and i have specified the namespace in it. I imported that class into project, than i created DATA folder, then i placed that class in there and finally i have changed its namespace name to TestMvcApp.Data! That class is from my another project.

Marco Alves · Accepted Answer · 2014-01-07 19:53:32Z

4

I don't know why, but in my case when I added the custom class, Visual Studio 2013 didn't mark it to compile. Instead, it was marked as "Content".

I got to know it because I edited the .csproj and my class was placed just as "Include". I changed it to "Compile" and voilá, it worked!

You may use the "Build Action" class's file property in the Properties Window.

answered Jan 7, 2014 at 19:53

Marco Alves

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2 Comments

Axeman Over a year ago

Same for me (VS2012, and this happened just for one of many cs files created in the same way)

Edyn Over a year ago

This happened to me when I copied a class file from another project.

Zann Anderson · Accepted Answer · 2011-03-09 13:47:45Z

2

Did you create the class before or after you put it in the "Data" folder? If it was before, does it still just belong to the TestMvcApp namespace, or did you change its namespace to be TestMvcApp.Data? If not, you need to either change the namespace the class is in or change the using statement.

answered Mar 9, 2011 at 13:47

Zann Anderson

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4 Comments

sanjuro Over a year ago

hi, thx for answer, i imported that class into project, than i created DATA folder, then i placed that class in there and finally i have changed its namespace name to TestMvcApp.Data! That class is from my another project.

Zann Anderson Over a year ago

Maybe try posting a portion of the code for the class as well as for the controller so we can see the declarations and the using statement. Just like @Cpfohl said, it's difficult to give a lot of guidance without more info.

sanjuro Over a year ago

i dont know why but when i created in Data Folder ProductDB class manually, everything is ok, so i copied only the code of that class and problem is solved. But I am still wondering why it was not recognizing imported class, weird.

Zann Anderson Over a year ago

Who knows - sometimes you think you've done everything right but you missed some small thing - happens to me all the time. Glad to hear it's working for you now.

Darin Dimitrov · Accepted Answer · 2011-03-09 13:45:59Z

1

If your class is called Data and your namespace is called TestMvcApp.Data I suspect that there is a naming collision.

answered Mar 9, 2011 at 13:45

Darin Dimitrov

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1 Comment

sanjuro Over a year ago

sorry i forgot, name of my class is "ProductDB"

SynerCoder · Accepted Answer · 2011-03-09 13:45:52Z

0

You must also set the namespace of the class to TestMvcApp.Data

answered Mar 9, 2011 at 13:45

SynerCoder

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