string cat and singeltonpattern

WindowsFormsApp01/ClassLibrary01/Class1.cs

@@ -1,14 +1,21 @@
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace ClassLibrary01
 {
-    public class Class1
+    public class Class1 :IDisposable
     {
 
+
+        public void DoIt()
+        {
+            var foo = SingeltonPattern.GetInstance();
+        }
+
         public int Add(int i1, int i2 = 10)
         {
             return i1 + i2;
@@ -19,5 +26,20 @@ namespace ClassLibrary01
             return Add(i1, 10);
         }
 
+        private Pen _pen;
+
+        public void Dispose()
+        {
+            _pen.Dispose();
+        }
+
+
+        public Pen getPen()
+        {
+
+            _pen = new Pen(Color.Black, 2);
+
+            return _pen;
+        }
     }
 }

WindowsFormsApp01/ClassLibrary01/ClassLibrary01.csproj

@@ -1,10 +1,10 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?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>4859a826-18e2-4c0c-a441-f77975e70e93</ProjectGuid>
+    <ProjectGuid>{4859A826-18E2-4C0C-A441-F77975E70E93}</ProjectGuid>
     <OutputType>Library</OutputType>
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>ClassLibrary01</RootNamespace>
@@ -31,24 +31,20 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="System"/>
-    
-    <Reference Include="System.Core"/>
-    <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"/>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Drawing" />
+    <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="Class1.cs" />
+    <Compile Include="CodeFile1.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
- </Project>
+</Project>

WindowsFormsApp01/ClassLibrary01/CodeFile1.cs

@@ -0,0 +1,33 @@
+
+using System.Runtime.CompilerServices;
+
+public class SingeltonPattern
+{
+
+
+
+    private static SingeltonPattern _singelton;
+
+
+    private SingeltonPattern()
+    {
+
+    }
+
+
+    public static SingeltonPattern GetInstance()
+    {
+        if (_singelton == null)
+        {
+            _singelton = new SingeltonPattern();
+        }
+
+        return _singelton;
+
+    }
+
+
+}
+
+
+

WindowsFormsApp01/ClassLibrary01/obj/Debug/ClassLibrary01.csproj.CoreCompileInputs.cache

@@ -1 +1 @@
-69d79abfd67c28b98a7f19e87fceac8121786190
+165664fdbdaecd0156134d10b5983b1832f42627

WindowsFormsApp01/ClassLibrary01/obj/Debug/ClassLibrary01.csproj.FileListAbsolute.txt

@@ -4,3 +4,9 @@ C:\Users\root\source\repos\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibra
 C:\Users\root\source\repos\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.csproj.CoreCompileInputs.cache
 C:\Users\root\source\repos\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.dll
 C:\Users\root\source\repos\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.pdb
+C:\Users\root\source\SoftwareEngineering2\WindowsFormsApp01\ClassLibrary01\bin\Debug\ClassLibrary01.dll
+C:\Users\root\source\SoftwareEngineering2\WindowsFormsApp01\ClassLibrary01\bin\Debug\ClassLibrary01.pdb
+C:\Users\root\source\SoftwareEngineering2\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.csprojAssemblyReference.cache
+C:\Users\root\source\SoftwareEngineering2\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.csproj.CoreCompileInputs.cache
+C:\Users\root\source\SoftwareEngineering2\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.dll
+C:\Users\root\source\SoftwareEngineering2\WindowsFormsApp01\ClassLibrary01\obj\Debug\ClassLibrary01.pdb