Add reference problem

I have added these three references to my solution using References/Add reference option :

Microsoft.DirectX
Microsoft.DirectX.Direct3D
Microsoft.DirectX.Direct3DX;

After that, above references can be seen inside Project / References folder.

Then I have typed in using directives to program code:

using Microsoft.DirectX;using Microsoft.DirectX.Direct3D;using Microsoft.DirectX.Direct3DX;

When I have tried to build program, this error message came up:

The type or namespace name 'Direct3DX' does not exist in the namespace 'Microsoft.DirectX' (are you missing an assembly reference?) (CS0234) - D:\PROJEKTI\Teren\Teren\Graphical_Matrix_Representation.cs:64,25.

How this error is possible when reference exists inside Project / References folder ?


I have read most of the answers to similar questions but there is no solution to my problem.

I have tried to download Microsoft.DirectX.Direct3DX.dll and manually add reference to the project, but there is same error.

Is there a sharp develop substitute for Microsoft DirectX.