Server is now able to read data and confirm data it received.

ErgometerServer/Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -46,10 +47,52 @@ namespace ErgometerServer
             TcpClient client = obj as TcpClient;
             StreamReader reader = new StreamReader(client.GetStream(), Encoding.ASCII);
             StreamWriter stream = new StreamWriter(client.GetStream(), Encoding.ASCII);
-            string q = reader.ReadLine();
+            string name = null;
-            if(q == "1«")
+            int session = 0;
-            Console.WriteLine(q);
+            bool doctor;
-
+            string a = reader.ReadLine();
+            Console.WriteLine(a);
+            if (a.StartsWith("1»") && a.EndsWith("connect"))
+            {
+                Console.WriteLine("Connection established");
+                stream.WriteLine(a.Substring(0, a.Length - 7) + "cs");
+            }
+            string b = reader.ReadLine();
+            if (b.StartsWith("2»"))
+            {
+                Console.WriteLine(b);
+                string[] package = b.Split('»');
+                name = package[2];
+                session = int.Parse(package[1]);
+                doctor = package[3].Equals("doctor");
+                if (doctor)
+                {
+                    //check password
+                }
+                else
+                {
+                    Console.WriteLine("login of " + name + " succesful");
+                    stream.WriteLine("2»" + package[1] + "»client»ls");
+                }
+            }
+            string c = reader.ReadLine();
+            ArrayList data = new ArrayList();
+            while (c.StartsWith("3»"))
+            {
+                Console.WriteLine(c);
+                data.Add(c);
+                stream.WriteLine("3»" + session + "»succes");
+                c = reader.ReadLine();
+            }
+            string d = reader.ReadLine();
+            ArrayList oldData = new ArrayList();
+            while (c.StartsWith("4»"))
+            {
+                Console.WriteLine(d);
+                oldData.Add(d);
+                stream.WriteLine("4»" + session + "»succes");
+                d = reader.ReadLine();
+            }
             stream.Flush();
             stream.Close();
             reader.Close();