I'm trying to import a dll to my C# project using DllImport as follows:
[DllImport("kernel32")] private static extern long WritePrivateProfileString(string section, string key,string val,string filePath); Also, I have added the namespace System.Runtime.InteropServices:
using System.Runtime.InteropServices; Still, I'm getting an error: "The name 'DllImport' does not exist in the current context"
Is there a limitation on where in a class you can import a dll?
You've probably also got the wrong return type in your statement. Try with bool:
[DllImport("kernel32")] private static extern bool WritePrivateProfileString(string section, string key,string val,string filePath); References: http://msdn.microsoft.com/en-us/library/ms725501(v=vs.85).aspx
EDIT:
DllImports have to be placed inside the body of your class. Not inside methods or the constructor.
public class Class1 { //DllImport goes here: [DllImport("kernel32")] private static extern ... public Class1() { ... } /* snip */ } 
In your solution explorer, right-click references, select Add Reference, and add the System.Runtime.InteropServices to your project.
You can't do using <assembly>; if it's not also referenced in your project.
EDIT
Actually, just saw your comment on your question. I think (haven't done Interop in a while) that it has to be outside a function, in the body of the class.
i.e.:
public class MyClass { [DLLImport("kernel32")] private static extern long WritePrivateProfileString(string sectio, string key, string val, string filePath); public MyClass() { } public void foo() { } // etc, etc } Try Adding these parameters
[DllImport("kernel32",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)] usually when importing win dll you use unsafe code sow be sure to check the project settings here are two simple tutorial that shows the code
