YamangTools.YamangDll.D3DCleanUp C# (CSharp) Method

        public static extern void D3DCleanUp();

 private void exitToolStripMenuItem_Click(object sender, EventArgs e)
 {
     isRunning = false;
     YamangDll.HeightMapCleanup();
     YamangDll.D3DCleanUp();
     //YamangDll.MeshObjectCleanUp(ref infoPtr);
     Application.Exit();
 }