diff --git a/MultiThreadingStudy/AboutThread/App.config b/MultiThreadingStudy/AboutThread/App.config
new file mode 100644
index 0000000..aee9adf
--- /dev/null
+++ b/MultiThreadingStudy/AboutThread/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/MultiThreadingStudy/AboutThread/CreateThread.cs b/MultiThreadingStudy/AboutThread/CreateThread.cs
new file mode 100644
index 0000000..c6bf001
--- /dev/null
+++ b/MultiThreadingStudy/AboutThread/CreateThread.cs
@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace CreateThread
+{
+ internal class CreateThread
+ {
+ public static void Create()
+ {
+ // Do in new thread
+ Thread t1 = new Thread(new ThreadStart(Run));
+ t1.Start();
+
+ // Do in main thread
+ Run();
+ }
+
+ public static void CreateManyWay()
+ {
+ // Create ThreadStart delegate
+ Thread t1 = new Thread(new ThreadStart(Run));
+ t1.Start();
+
+ // Infer by method and create delgate
+ Thread t2 = new Thread(Run);
+ t2.Start();
+
+ // Use anonymous method
+ Thread t3 = new Thread(delegate ()
+ {
+ Run();
+ });
+ t3.Start();
+
+ // Use lambda expression
+ Thread t4 = new Thread(() => Run());
+ t4.Start();
+
+ // Short
+ new Thread(() => Run()).Start();
+ }
+
+ public static void CreateParameterized()
+ {
+ Thread t1 = new Thread(new ParameterizedThreadStart(Calc));
+ t1.Start(10.0);
+
+ Thread t2 = new Thread(() => Sum(10, 20, 30));
+ t2.Start();
+ }
+
+ public static void CreateOtherClassMethod()
+ {
+ OuterClass obj = new OuterClass();
+ Thread t = new Thread(obj.Run);
+ t.Start();
+ }
+
+ public static void CreateBackgroundThread()
+ {
+ Thread t = new Thread(new ThreadStart(EndlessRun));
+ t.IsBackground = true;
+ t.Start();
+ }
+
+ public static void CreateForegroundThread()
+ {
+ Thread t = new Thread(new ThreadStart(EndlessRun));
+ t.IsBackground = false; // default
+ t.Start();
+ }
+
+ private static void Run()
+ {
+ Console.WriteLine($"Thread#{Thread.CurrentThread.ManagedThreadId}: Start");
+ // Do something
+ Thread.Sleep(3000);
+ Console.WriteLine($"Thread#{Thread.CurrentThread.ManagedThreadId}: Finish");
+ }
+
+ private static void Calc(object radius)
+ {
+ double r = (double)radius;
+ double area = r * r * Math.PI;
+ Console.WriteLine($"r={radius}, area={area}");
+ }
+
+ private static void Sum(int d1, int d2, int d3)
+ {
+ int sum = d1 + d2 + d3;
+ Console.WriteLine($"sum={sum}");
+ }
+
+ private static void EndlessRun()
+ {
+ int i = 0;
+ while (true)
+ {
+ Console.WriteLine($"running... ({++i})");
+ Thread.Sleep(1000);
+ }
+ }
+ }
+
+ internal class OuterClass
+ {
+ public void Run()
+ {
+ Console.WriteLine("OuterClass.Run");
+ }
+ }
+}
diff --git a/MultiThreadingStudy/AboutThread/CreateThread.csproj b/MultiThreadingStudy/AboutThread/CreateThread.csproj
new file mode 100644
index 0000000..4158db6
--- /dev/null
+++ b/MultiThreadingStudy/AboutThread/CreateThread.csproj
@@ -0,0 +1,54 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {8724C07D-B729-4CEC-AA91-BEEA9C96409C}
+ Exe
+ AboutThread
+ AboutThread
+ v4.8.1
+ 512
+ true
+ true
+
+
+ AnyCPU
+ true
+ full
+ false
+ bin\Debug\
+ DEBUG;TRACE
+ prompt
+ 4
+
+
+ AnyCPU
+ pdbonly
+ true
+ bin\Release\
+ TRACE
+ prompt
+ 4
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/MultiThreadingStudy/AboutThread/Program.cs b/MultiThreadingStudy/AboutThread/Program.cs
new file mode 100644
index 0000000..202f117
--- /dev/null
+++ b/MultiThreadingStudy/AboutThread/Program.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CreateThread
+{
+ internal class Program
+ {
+ static void Main(string[] args)
+ {
+ //CreateThread.Create();
+
+ //CreateThread.CreateManyWay();
+
+ //CreateThread.CreateOtherClassMethod();
+
+ //CreateThread.CreateParameterized();
+
+ //CreateThread.CreateBackgroundThread();
+
+ CreateThread.CreateForegroundThread();
+
+ //Console.ReadKey();
+ }
+ }
+}
diff --git a/MultiThreadingStudy/AboutThread/Properties/AssemblyInfo.cs b/MultiThreadingStudy/AboutThread/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..9294e26
--- /dev/null
+++ b/MultiThreadingStudy/AboutThread/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 어셈블리에 대한 일반 정보는 다음 특성 집합을 통해
+// 제어됩니다. 어셈블리와 관련된 정보를 수정하려면
+// 이러한 특성 값을 변경하세요.
+[assembly: AssemblyTitle("AboutThread")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("AboutThread")]
+[assembly: AssemblyCopyright("Copyright © 2022")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible을 false로 설정하면 이 어셈블리의 형식이 COM 구성 요소에
+// 표시되지 않습니다. COM에서 이 어셈블리의 형식에 액세스하려면
+// 해당 형식에 대해 ComVisible 특성을 true로 설정하세요.
+[assembly: ComVisible(false)]
+
+// 이 프로젝트가 COM에 노출되는 경우 다음 GUID는 typelib의 ID를 나타냅니다.
+[assembly: Guid("8724c07d-b729-4cec-aa91-beea9c96409c")]
+
+// 어셈블리의 버전 정보는 다음 네 가지 값으로 구성됩니다.
+//
+// 주 버전
+// 부 버전
+// 빌드 번호
+// 수정 버전
+//
+// 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호를
+// 기본값으로 할 수 있습니다.
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/MultiThreadingStudy/MultiThreadingStudy.sln b/MultiThreadingStudy/MultiThreadingStudy.sln
new file mode 100644
index 0000000..12adebb
--- /dev/null
+++ b/MultiThreadingStudy/MultiThreadingStudy.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32929.385
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CreateThread", "AboutThread\CreateThread.csproj", "{8724C07D-B729-4CEC-AA91-BEEA9C96409C}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {8724C07D-B729-4CEC-AA91-BEEA9C96409C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {8724C07D-B729-4CEC-AA91-BEEA9C96409C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {8724C07D-B729-4CEC-AA91-BEEA9C96409C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {8724C07D-B729-4CEC-AA91-BEEA9C96409C}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {ABBF91D6-78C7-423A-9442-2C968B7061DA}
+ EndGlobalSection
+EndGlobal