Mouse simulator without setting cursor position

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C#

How to simulate mouse clicks without moving the cursor position first?

I have a program that perform mouse click on foreground window, in which I am using SendInput or SendMessage to emulate left mouse click. The issue is, that if I set cursor to clicking position will make the click, however if I don't set cursor than no click happens even trough I do pass x and y points. I would like to perform left mouse click without the need of actually moving the cursor at all.

Thank you in advance.

What I have tried:

// ------------------------------- SendInput --------------------------------//

[DllImport("user32.dll", SetLastError = true)]
        static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);

        [Flags]
        enum MouseEventFlags : uint
        {
            MOUSEEVENTF_MOVE = 0x0001,
            MOUSEEVENTF_LEFTDOWN = 0x0002,
            MOUSEEVENTF_LEFTUP = 0x0004,
            MOUSEEVENTF_RIGHTDOWN = 0x0008,
            MOUSEEVENTF_RIGHTUP = 0x0010,
            MOUSEEVENTF_MIDDLEDOWN = 0x0020,
            MOUSEEVENTF_MIDDLEUP = 0x0040,
            MOUSEEVENTF_XDOWN = 0x0080,
            MOUSEEVENTF_XUP = 0x0100,
            MOUSEEVENTF_WHEEL = 0x0800,
            MOUSEEVENTF_VIRTUALDESK = 0x4000,
            MOUSEEVENTF_ABSOLUTE = 0x8000
        }
        enum SendInputEventType : int
        {
            InputMouse,
            InputKeyboard,
            InputHardware
        }

        enum SystemMetric
        {
            SM_CXSCREEN = 0,
            SM_CYSCREEN = 1,
        }
        [DllImport("user32.dll")]
        static extern int GetSystemMetrics(SystemMetric smIndex);

        public static void ClickLeftMouseButton(Point p)
        {
            INPUT mouseInput = new INPUT();
            mouseInput.type = SendInputEventType.InputMouse;
            mouseInput.mkhi.mi.dx = (p.X * 65536) / GetSystemMetrics(SystemMetric.SM_CXSCREEN);
            mouseInput.mkhi.mi.dy = (p.Y * 65536) / GetSystemMetrics(SystemMetric.SM_CYSCREEN);
            mouseInput.mkhi.mi.mouseData = 0;


            mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN | MouseEventFlags.MOUSEEVENTF_ABSOLUTE;
            SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));

            mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP | MouseEventFlags.MOUSEEVENTF_ABSOLUTE;
            SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));

        }

// ------------------------------- SendInput --------------------------------//

// ------------------------------- SendMessage --------------------------------//

public enum WMessages : int
        {
            WM_LBUTTONDOWN = 0x201, //Left mousebutton down
            WM_LBUTTONUP = 0x202,  //Left mousebutton up
            WM_LBUTTONDBLCLK = 0x203, //Left mousebutton doubleclick
            WM_RBUTTONDOWN = 0x204, //Right mousebutton down
            WM_RBUTTONUP = 0x205,   //Right mousebutton up
            WM_RBUTTONDBLCLK = 0x206, //Right mousebutton doubleclick
            WM_KEYDOWN = 0x100,  //Key down
            WM_KEYUP = 0x101,   //Key up
            WM_CLICK = 0x00F5,
        }
        [DllImport("user32.dll")]
        public static extern IntPtr FindWindow(string sClassName, string sAppName);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
        static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        [DllImport("user32.dll")]
        static extern IntPtr WindowFromPoint(int xPoint, int yPoint);

        private void button1_Click(object sender, EventArgs e)
        {
            Point pt = new Point(263, 88);
            IntPtr handle = WindowFromPoint(pt.X, pt.Y);
            
            SendMessage(this.Handle, (int)WMessages.WM_LBUTTONDOWN, 0, MAKELPARAM(pt.X, pt.Y));

}
// ------------------------------- SendMessage --------------------------------//