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NewFindACouple/NewFindACouple.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33403.182
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NewFindACouple", "NewFindACouple\NewFindACouple.csproj", "{5457E0B8-11B5-4D65-A76F-7302B1685CA1}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5457E0B8-11B5-4D65-A76F-7302B1685CA1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5457E0B8-11B5-4D65-A76F-7302B1685CA1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5457E0B8-11B5-4D65-A76F-7302B1685CA1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5457E0B8-11B5-4D65-A76F-7302B1685CA1}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6AA191F3-0691-4C77-BC4D-D010165093BC}
+	EndGlobalSection
+EndGlobal

NewFindACouple/NewFindACouple/Form1.cs

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+using System;
+
+namespace NewFindACouple
+{
+    public partial class Form1 : Form
+    {
+        private string previousButtonTag = string.Empty;
+        private Button previousButton;
+
+        private void Button_Click(object sender, EventArgs eventArgs)
+        {
+            var button = (Button)sender;
+            if (previousButtonTag != string.Empty && previousButtonTag != "-")
+            {
+                if (button.Tag == null || previousButton.Tag == null)
+                {
+                    throw new NullReferenceException();
+                }
+
+                if (previousButtonTag == button.Tag.ToString())
+                {
+                    previousButton.Text = previousButton.Tag.ToString();
+                    button.Text = button.Tag.ToString();
+                    previousButton.Tag = "-";
+                    button.Tag = "-";
+                }
+            }
+            previousButtonTag = string.Copy(button.Tag.ToString());
+        } 
+
+        public void AddGrid(int size)
+        {
+
+            int[] arrayForNumbers = new int[size * size];
+
+            for (int i = 0; i < size * size; i++)
+            {
+                arrayForNumbers[i] = i;
+            }
+
+            for (int i = 0; i < size; i++)
+            {
+                var random = new Random();
+                var firstIndex = random.Next(0, size * size);
+                var secondIndex = random.Next(0, size * size);
+                if (firstIndex != secondIndex)
+                {
+                    var copy = arrayForNumbers[firstIndex];
+                    arrayForNumbers[firstIndex] = arrayForNumbers[secondIndex];
+                    arrayForNumbers[secondIndex] = copy;
+                }
+            }
+
+            int k = 0;
+            int top = 10;
+            int left = 10;
+
+            for (int i = 0; i < size; i++)
+            {
+                for (int j = 0; j < size; ++j)
+                {
+                    Button button = new Button();
+                    button.Left = left;
+                    button.Top = top;
+                    button.Location = new Point(left, top);
+
+                    this.Controls.Add(button);
+                    top += button.Height + 2;
+                    button.Name = "btn" + i + '.' + j;
+                    button.Tag = arrayForNumbers[k].ToString();
+                    left += 100;
+                    ++k;
+                    button.Click += Button_Click;
+
+                }
+
+                top += 40;
+                left = 10;
+            }
+        }
+
+        public Form1(int size)
+        {
+            InitializeComponent();
+            AddGrid(size);
+        }
+
+        private void Form1_Load(object sender, EventArgs e)
+        {
+
+        }
+    }
+}

NewFindACouple/NewFindACouple/Form1.resx

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+<root>
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

NewFindACouple/NewFindACouple/IncorectNumberException.cs

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+namespace NewFindACouple;
+internal class IncorectNumberException : Exception{}

NewFindACouple/NewFindACouple/NewFindACouple.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net7.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>

NewFindACouple/NewFindACouple/NewFindACouple.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <ItemGroup>
+        <Compile Update="Form1.cs">
+            <SubType>Form</SubType>
+        </Compile>
+    </ItemGroup>
+</Project>

NewFindACouple/NewFindACouple/Program.cs

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+namespace NewFindACouple
+{
+    internal static class Program
+    {
+        /// <summary>
+        ///  The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main(string[] args)
+        {
+            int result = 0;
+            bool check = int.TryParse(args[0], out result);
+            if (!check)
+            {
+                throw new IncorectNumberException();
+            }
+            ApplicationConfiguration.Initialize();
+            Application.Run(new Form1(result));
+        }
+    }
+}