C# draw rectangle on screen

using System.Drawing;
using System.Runtime.InteropServices;
        [DllImport("User32.dll")]
        public static extern IntPtr GetDC(IntPtr hwnd);
        [DllImport("User32.dll")]
        public static extern void ReleaseDC(IntPtr hwnd, IntPtr dc); 

IntPtr desktopPtr = GetDC(IntPtr.Zero);
                Graphics g = Graphics.FromHdc(desktopPtr);


                SolidBrush b = new SolidBrush(Color.White);
                g.FillRectangle(b, new Rectangle(0, 0, 1920, 1080));

                ReleaseDC(IntPtr.Zero, desktopPtr);
                g.Dispose();

Similar codes

4 votes135 views1 answer
C# remove from list in foreach
C#
0 vote135 views3 answers
C sharp convert string time into 24 hours time
C#
8 votes150 views3 answers
List of list of string to list of string c#
C#
-1 vote146 views1 answer
C# fileinfo filename without extension
C#
0 vote146 views1 answer
Save current dir shell
C#
0 vote136 views1 answer
C# datediff minutes
C#
0 vote131 views2 answers
__dopostback
C#
0 vote132 views1 answer
How to get relative path in c#
C#
11 votes126 views2 answers
Unity how to change rotation
C#
0 vote129 views1 answer
Asp.net mvc hide div from controller
C#