asp.net use class in app_code folder

Question

the index page I use is index.aspx and the c# class is called index.aspx.cs.

In the app_code folder I have another folder called "database" and within that folder is a .cs file called Query.cs

Now in the index.aspx.cs file I want to call the Query.cs class with the following code:

private Query query = new Query();

but it can't find Query.

What can I do?

Is Query the name of the class in that file? If so, is it public? — B. Clay Shannon-B. Crow Raven
– B. Clay Shannon-B. Crow Raven, Commented Dec 8, 2015 at 22:48
The App_Code directory is special in ASP.NET and compiled at runtime, not design time. Program code contained within is only accessible from "code file" classes and .aspx files, not "code-behind" files — Dai
– Dai, Commented Dec 8, 2015 at 22:49
well, I can call the Query class in other .cs files in the app_code folder. — Lesley Peters
– Lesley Peters, Commented Dec 8, 2015 at 22:51
Try with the fully qualified name. Include the namespace: YourAppName.Query — Vi100
– Vi100, Commented Dec 8, 2015 at 22:53

Vijay Kumbhoje · Accepted Answer · 2015-12-09 00:41:04Z

2

See Below Example

Your App_Code Class File like below

public class Query
{
    public Datatable SelectData()
    {
        // Query Goes Here..
    }
}

Your index.aspx.cs file will be

//Create Object of Class
Query query = new Query();
Datatable dt = query.SelectData();
//Here Datatable is just considered for example

If you are calling class from another project you need give reference to that project.

Most of the times Access Modifiers are the issues in calling class members.

answered Dec 9, 2015 at 0:34

Vijay Kumbhoje

1,4432 gold badges25 silver badges45 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1