Problem in adding dll files

[Nanda1605]

Hi I am trying to add *.dll files as a reference in VB.NET 2005 but am recieveing the message as 'A reference (Path) could not be added please make sure that the file is accessible and that it is a valid assembly or COM components'. Help me to proceed......

Thanks, Nanda

[WhiteGirl23]

hi, if you want to add reference to project: go in solution explorer and you will find Reference and click right on Reference and choose Add Reference and after that you can choose your reference hope it helped.

[Nanda1605]

Hi, am recieving the error message while adding the reference(i can't able to add that dll), please help in this Error message: 'A reference (Path) could not be added please make sure that the file is accessible and that it is a valid assembly or COM components'.

Thanks, Nanda

[Dave Kreskowiak]

You're getting this error message because your trying to add a reference to a .DLL that is not COM-based, just like the message says. In order to use the functions in that .DLL, you do NOT add a reference to it. You call the functions through P/Invoke. Define the function headers in your code using the Declare statement and setting up the arguments that the function is expecting. For example, to call the Win32 Beep function found in kernel32.dll:

Declare Function Beep Lib "kernel32.dll" (ByVal frequency As Integer, ByVal duration As Integer) As Boolean

Then later in your code:

Dim r As Boolean
' Make a sound at 4000Hz, for 250 millisecond (1/4 second)
r = Beep(4000, 250)

A guide to posting questions on CodeProject[^]
Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
     2006, 2007