Initial Commit

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

ConsoleApp1.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{CE05578D-0247-4C11-9319-5F1E77CCB4E1}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>ConsoleApp1</RootNamespace>
+    <AssemblyName>ConsoleApp1</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Program.cs

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+using System;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Windows.Forms;
+
+namespace GridToggler
+{
+    static class Program
+    {
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new MainForm());
+        }
+    }
+
+    public class MainForm : Form
+    {
+        private const int GRID_SIZE = 20;
+        private const int BOX_SIZE = 20;
+
+        private int[,] boxes;
+        private Rectangle[,] rectangles;
+        private bool isFilling;
+        private bool isClearing;
+
+        private MenuStrip menuStrip;
+        private ToolStripMenuItem fileToolStripMenuItem;
+        private ToolStripMenuItem saveImageToolStripMenuItem;
+        private ToolStripMenuItem clearGridToolStripMenuItem;
+
+        public MainForm()
+        {
+            InitializeComponent();
+
+            // Initialize grid of boxes
+            boxes = new int[GRID_SIZE, GRID_SIZE];
+            rectangles = new Rectangle[GRID_SIZE, GRID_SIZE];
+
+            for (int x = 0; x < GRID_SIZE; x++)
+            {
+                for (int y = 0; y < GRID_SIZE; y++)
+                {
+                    boxes[x, y] = 0;
+                    rectangles[x, y] = new Rectangle(x * BOX_SIZE, y * BOX_SIZE, BOX_SIZE, BOX_SIZE);
+                }
+            }
+        }
+
+        private void MainForm_Paint(object sender, PaintEventArgs e)
+        {
+            Graphics g = e.Graphics;
+
+            for (int x = 0; x < GRID_SIZE; x++)
+            {
+                for (int y = 0; y < GRID_SIZE; y++)
+                {
+                    Rectangle rect = rectangles[x, y];
+
+                    if (boxes[x, y] == 1)
+                        g.FillRectangle(Brushes.Black, rect);
+                    else
+                        g.FillRectangle(Brushes.White, rect);
+
+                    g.DrawRectangle(Pens.Black, rect);
+                }
+            }
+        }
+
+        private void MainForm_MouseDown(object sender, MouseEventArgs e)
+        {
+            if (e.Button == MouseButtons.Left)
+                isFilling = true;
+            else if (e.Button == MouseButtons.Right)
+                isClearing = true;
+
+            ToggleBoxState(e);
+        }
+
+        private void MainForm_MouseUp(object sender, MouseEventArgs e)
+        {
+            isFilling = false;
+            isClearing = false;
+        }
+
+        private void MainForm_MouseMove(object sender, MouseEventArgs e)
+        {
+            if (isFilling || isClearing)
+                ToggleBoxState(e);
+        }
+
+        private void ToggleBoxState(MouseEventArgs e)
+        {
+            int x = e.X / BOX_SIZE;
+            int y = e.Y / BOX_SIZE;
+
+            if (x >= 0 && x < GRID_SIZE && y >= 0 && y < GRID_SIZE)
+            {
+                if (isFilling)
+                    boxes[x, y] = 1;
+                else if (isClearing)
+                    boxes[x, y] = 0;
+
+                Invalidate(rectangles[x, y]);
+            }
+        }
+
+        private void SaveImageToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            using (Bitmap bitmap = new Bitmap(GRID_SIZE * BOX_SIZE, GRID_SIZE * BOX_SIZE))
+            {
+                using (Graphics g = Graphics.FromImage(bitmap))
+                {
+                    for (int x = 0; x < GRID_SIZE; x++)
+                    {
+                        for (int y = 0; y < GRID_SIZE; y++)
+                        {
+                            Rectangle rect = rectangles[x, y];
+
+                            if (boxes[x, y] == 1)
+                                g.FillRectangle(Brushes.Black, rect);
+                            else
+                                g.FillRectangle(Brushes.White, rect);
+
+                            g.DrawRectangle(Pens.Black, rect);
+                        }
+                    }
+                }
+
+                SaveFileDialog saveFileDialog = new SaveFileDialog();
+                saveFileDialog.Filter = "PNG Image|*.png";
+                saveFileDialog.Title = "Save Image";
+                saveFileDialog.ShowDialog();
+
+                if (saveFileDialog.FileName != "")
+                    bitmap.Save(saveFileDialog.FileName, ImageFormat.Png);
+            }
+        }
+
+        private void ClearGridToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            for (int x = 0; x < GRID_SIZE; x++)
+            {
+                for (int y = 0; y < GRID_SIZE; y++)
+                {
+                    boxes[x, y] = 0;
+                    Invalidate(rectangles[x, y]);
+                }
+            }
+        }
+
+        private void InitializeComponent()
+        {
+            menuStrip = new MenuStrip();
+            fileToolStripMenuItem = new ToolStripMenuItem();
+            saveImageToolStripMenuItem = new ToolStripMenuItem();
+            clearGridToolStripMenuItem = new ToolStripMenuItem();
+
+            menuStrip.Items.AddRange(new ToolStripItem[] { fileToolStripMenuItem });
+            fileToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { clearGridToolStripMenuItem, saveImageToolStripMenuItem });
+            fileToolStripMenuItem.Name = "fileToolStripMenuItem";
+            fileToolStripMenuItem.Size = new Size(37, 20);
+            fileToolStripMenuItem.Text = "File";
+
+            clearGridToolStripMenuItem.Name = "clearGridToolStripMenuItem";
+            fileToolStripMenuItem.Size = new Size(37, 20);
+            this.SuspendLayout();
+
+            // Create menu strip
+            menuStrip = new MenuStrip();
+            fileToolStripMenuItem = new ToolStripMenuItem();
+            saveImageToolStripMenuItem = new ToolStripMenuItem();
+            clearGridToolStripMenuItem = new ToolStripMenuItem();
+
+            menuStrip.Items.AddRange(new ToolStripItem[] { fileToolStripMenuItem });
+            fileToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { clearGridToolStripMenuItem, saveImageToolStripMenuItem });
+            fileToolStripMenuItem.Name = "fileToolStripMenuItem";
+            fileToolStripMenuItem.Size = new Size(37, 20);
+            fileToolStripMenuItem.Text = "File";
+
+            saveImageToolStripMenuItem.Name = "saveImageToolStripMenuItem";
+            saveImageToolStripMenuItem.Size = new Size(133, 22);
+            saveImageToolStripMenuItem.Text = "Save Image";
+            saveImageToolStripMenuItem.Click += SaveImageToolStripMenuItem_Click;
+
+            clearGridToolStripMenuItem.Name = "clearGridToolStripMenuItem";
+            clearGridToolStripMenuItem.Size = new Size(133, 22);
+            clearGridToolStripMenuItem.Text = "Clear Grid";
+            clearGridToolStripMenuItem.Click += ClearGridToolStripMenuItem_Click;
+
+            Controls.Add(menuStrip);
+
+            // Configure form properties
+            ClientSize = new Size(GRID_SIZE * BOX_SIZE, GRID_SIZE * BOX_SIZE);
+            DoubleBuffered = true;
+            FormBorderStyle = FormBorderStyle.FixedSingle;
+            MaximizeBox = false;
+            Name = "MainForm";
+            StartPosition = FormStartPosition.CenterScreen;
+            Text = "Grid Toggler";
+            Paint += MainForm_Paint;
+            MouseDown += MainForm_MouseDown;
+            MouseUp += MainForm_MouseUp;
+            MouseMove += MainForm_MouseMove;
+            ResumeLayout(false);
+            PerformLayout();
+            this.ResumeLayout(false);
+            this.PerformLayout();
+        }
+    }
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("ConsoleApp1")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ConsoleApp1")]
+[assembly: AssemblyCopyright("Copyright ©  2023")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("ce05578d-0247-4c11-9319-5f1e77ccb4e1")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]