diff --git a/SocketStudy/Client/App.config b/SocketStudy/Client/App.config
new file mode 100644
index 0000000..aee9adf
--- /dev/null
+++ b/SocketStudy/Client/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/SocketStudy/Client/Client.csproj b/SocketStudy/Client/Client.csproj
new file mode 100644
index 0000000..37c153a
--- /dev/null
+++ b/SocketStudy/Client/Client.csproj
@@ -0,0 +1,54 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {5263D61C-F3A5-4EDA-AC6D-5F721CDBD2AF}
+ Exe
+ Client
+ Client
+ 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/SocketStudy/Client/PClientSocket.cs b/SocketStudy/Client/PClientSocket.cs
new file mode 100644
index 0000000..26e234f
--- /dev/null
+++ b/SocketStudy/Client/PClientSocket.cs
@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Client
+{
+ class PClientSocket
+ {
+ private readonly int BUFF_SIZE = 8192;
+ private Socket sock;
+ private IPEndPoint endPoint;
+
+ public PClientSocket(string ip, int port)
+ {
+ // create socket
+ sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+ endPoint = new IPEndPoint(IPAddress.Parse(ip), port);
+ }
+
+ public void Connect()
+ {
+ // connect end point
+ sock.Connect(endPoint);
+
+ string cmd = string.Empty;
+ byte[] receiveBuff = new byte[BUFF_SIZE];
+
+ Console.WriteLine("Connected... Press Q to exit.");
+
+ while ((cmd = Console.ReadLine()) != "Q")
+ {
+ byte[] buff = Encoding.UTF8.GetBytes(cmd);
+
+ // send data
+ sock.Send(buff, SocketFlags.None);
+
+ // receive data
+ int n = sock.Receive(receiveBuff);
+
+ string data = Encoding.UTF8.GetString(receiveBuff, 0, n);
+ Console.WriteLine($"Received: {data}");
+ }
+
+ sock.Close();
+ }
+ }
+}
diff --git a/SocketStudy/Client/Program.cs b/SocketStudy/Client/Program.cs
new file mode 100644
index 0000000..b2d3bd2
--- /dev/null
+++ b/SocketStudy/Client/Program.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Client
+{
+ class Program
+ {
+ static void Main(string[] args)
+ {
+ PClientSocket clientSocket = new PClientSocket("127.0.0.1", 7777);
+ clientSocket.Connect();
+
+ Console.ReadKey();
+ }
+ }
+}
diff --git a/SocketStudy/Client/Properties/AssemblyInfo.cs b/SocketStudy/Client/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..8ba4d7a
--- /dev/null
+++ b/SocketStudy/Client/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("Client")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Client")]
+[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("5263d61c-f3a5-4eda-ac6d-5f721cdbd2af")]
+
+// 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/SocketStudy/Server/App.config b/SocketStudy/Server/App.config
new file mode 100644
index 0000000..aee9adf
--- /dev/null
+++ b/SocketStudy/Server/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/SocketStudy/Server/PServerSocket.cs b/SocketStudy/Server/PServerSocket.cs
new file mode 100644
index 0000000..27c152e
--- /dev/null
+++ b/SocketStudy/Server/PServerSocket.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Server
+{
+ class PServerSocket
+ {
+ private readonly int BUFF_SIZE = 8192;
+ private Socket sock;
+ private IPEndPoint endPoint;
+
+ public PServerSocket(int port)
+ {
+ // create socket
+ sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+ endPoint = new IPEndPoint(IPAddress.Any, port);
+ }
+
+ public void Listen()
+ {
+ sock.Bind(endPoint);
+
+ sock.Listen(10);
+
+ Socket clientSocket = sock.Accept();
+ Console.WriteLine($"Socket Accepted ({clientSocket.RemoteEndPoint.ToString()})");
+ Console.WriteLine("Press any key to exit.");
+
+ byte[] buff = new byte[BUFF_SIZE];
+ while (!Console.KeyAvailable)
+ {
+ // receive socket
+ int n = clientSocket.Receive(buff);
+
+ string data = Encoding.UTF8.GetString(buff, 0, n);
+ Console.WriteLine($"Received: {data}");
+
+ // send socket
+ data = "Echo from server " + data;
+ buff = Encoding.UTF8.GetBytes(data);
+ clientSocket.Send(buff, 0, buff.Length, SocketFlags.None);
+ }
+
+ clientSocket.Close();
+ sock.Close();
+ }
+ }
+}
diff --git a/SocketStudy/Server/Program.cs b/SocketStudy/Server/Program.cs
new file mode 100644
index 0000000..95633db
--- /dev/null
+++ b/SocketStudy/Server/Program.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Server
+{
+ class Program
+ {
+ static void Main(string[] args)
+ {
+ PServerSocket serverSocket = new PServerSocket(7777);
+ serverSocket.Listen();
+ }
+ }
+}
diff --git a/SocketStudy/Server/Properties/AssemblyInfo.cs b/SocketStudy/Server/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..28f63f0
--- /dev/null
+++ b/SocketStudy/Server/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("Server")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Server")]
+[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("408c9cc8-81eb-4ec1-b2d6-55fa2f976718")]
+
+// 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/SocketStudy/Server/Server_Single.csproj b/SocketStudy/Server/Server_Single.csproj
new file mode 100644
index 0000000..265f1e0
--- /dev/null
+++ b/SocketStudy/Server/Server_Single.csproj
@@ -0,0 +1,54 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {408C9CC8-81EB-4EC1-B2D6-55FA2F976718}
+ Exe
+ Server
+ Server
+ 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/SocketStudy/Server_Async/App.config b/SocketStudy/Server_Async/App.config
new file mode 100644
index 0000000..aee9adf
--- /dev/null
+++ b/SocketStudy/Server_Async/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/SocketStudy/Server_Async/PServerSocket.cs b/SocketStudy/Server_Async/PServerSocket.cs
new file mode 100644
index 0000000..5a0063a
--- /dev/null
+++ b/SocketStudy/Server_Async/PServerSocket.cs
@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Server_Async
+{
+ class PServerSocket
+ {
+ private readonly int BUFF_SIZE = 8192;
+ private Socket sock;
+ private IPEndPoint endPoint;
+
+ private List clientSockets;
+
+
+ public PServerSocket(int port)
+ {
+ // create socket
+ sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+ endPoint = new IPEndPoint(IPAddress.Any, port);
+ }
+
+ public async Task Listen()
+ {
+ clientSockets = new List();
+
+ sock.Bind(endPoint);
+
+ sock.Listen(100);
+
+ while (true)
+ {
+ Socket clientSocket = await Task.Factory.FromAsync(sock.BeginAccept, sock.EndAccept, null);
+ clientSockets.Add(clientSocket);
+
+ byte[] buff = new byte[BUFF_SIZE];
+
+ int n = await Task.Factory.FromAsync(
+ clientSocket.BeginReceive(buff, 0, buff.Length, SocketFlags.None, null, clientSocket),
+ clientSocket.EndReceive);
+
+ if (n > 0)
+ {
+ string data = Encoding.UTF8.GetString(buff, 0, n);
+ Console.WriteLine($"Received: {data}");
+
+ data = "Echo from server " + data;
+ buff = Encoding.UTF8.GetBytes(data);
+ await Task.Factory.FromAsync(
+ clientSocket.BeginSend(buff, 0, buff.Length, SocketFlags.None, null, clientSocket),
+ clientSocket.EndSend);
+ }
+
+ clientSocket.Close();
+ }
+ }
+ }
+}
diff --git a/SocketStudy/Server_Async/Program.cs b/SocketStudy/Server_Async/Program.cs
new file mode 100644
index 0000000..09636a5
--- /dev/null
+++ b/SocketStudy/Server_Async/Program.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Server_Async
+{
+ class Program
+ {
+ static void Main(string[] args)
+ {
+ PServerSocket serverSocket = new PServerSocket(7777);
+ serverSocket.Listen().Wait();
+
+ Console.ReadKey();
+ }
+ }
+}
diff --git a/SocketStudy/Server_Async/Properties/AssemblyInfo.cs b/SocketStudy/Server_Async/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..a5c8090
--- /dev/null
+++ b/SocketStudy/Server_Async/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("Server_Async")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Server_Async")]
+[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("94e9926e-cd35-49f8-867e-2e8b76e7fb1b")]
+
+// 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/SocketStudy/Server_Async/Server_Async.csproj b/SocketStudy/Server_Async/Server_Async.csproj
new file mode 100644
index 0000000..b94abdd
--- /dev/null
+++ b/SocketStudy/Server_Async/Server_Async.csproj
@@ -0,0 +1,54 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {94E9926E-CD35-49F8-867E-2E8B76E7FB1B}
+ Exe
+ Server_Async
+ Server_Async
+ 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/SocketStudy/SocketStudy.sln b/SocketStudy/SocketStudy.sln
new file mode 100644
index 0000000..4021734
--- /dev/null
+++ b/SocketStudy/SocketStudy.sln
@@ -0,0 +1,37 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.32630.194
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Client", "Client\Client.csproj", "{5263D61C-F3A5-4EDA-AC6D-5F721CDBD2AF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Server_Single", "Server\Server_Single.csproj", "{408C9CC8-81EB-4EC1-B2D6-55FA2F976718}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Server_Async", "Server_Async\Server_Async.csproj", "{94E9926E-CD35-49F8-867E-2E8B76E7FB1B}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {5263D61C-F3A5-4EDA-AC6D-5F721CDBD2AF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {5263D61C-F3A5-4EDA-AC6D-5F721CDBD2AF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {5263D61C-F3A5-4EDA-AC6D-5F721CDBD2AF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {5263D61C-F3A5-4EDA-AC6D-5F721CDBD2AF}.Release|Any CPU.Build.0 = Release|Any CPU
+ {408C9CC8-81EB-4EC1-B2D6-55FA2F976718}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {408C9CC8-81EB-4EC1-B2D6-55FA2F976718}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {408C9CC8-81EB-4EC1-B2D6-55FA2F976718}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {408C9CC8-81EB-4EC1-B2D6-55FA2F976718}.Release|Any CPU.Build.0 = Release|Any CPU
+ {94E9926E-CD35-49F8-867E-2E8B76E7FB1B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {94E9926E-CD35-49F8-867E-2E8B76E7FB1B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {94E9926E-CD35-49F8-867E-2E8B76E7FB1B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {94E9926E-CD35-49F8-867E-2E8B76E7FB1B}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {2041424D-E9A7-4F3E-B634-FDCD8ED3E667}
+ EndGlobalSection
+EndGlobal