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public struct RECT
{
      public int left;
      public int Top;
      public int Right;
      public int Bottom;
}
public static bool CenterMouseOn(int hwnd)
{
            int x=0;
            int y=0;
            int maxX=0;
            int maxY=0;
            RECT crect=new RECT();
            int gFound=0;
            GetDisplayResolution(ref maxX,ref maxY);
            gFound=GetWindowRect(hwnd,ref crect);
            x=crect.Left+((crect.Right-crect.Left)/2);
            y=crect.Top+((crect.Bottom-crect.Top)/2);
            if((x>=0&&x<=maxX)&&(y>=0&&y<=maxY))
            {
               MoveMouse(hwnd,x,y);
                return true;
            }
             return false;
}
public static void GetDisplayResolution(ref int pixelX,ref int pixelY)
{
   pixelX=GetSystemMetrics(SM_CXSCREEN);
   pixelY=GetSystemMetrics(SM_CYSCREEN);
}