Added a little beginning to the table.

ErgometerDoctorApplication/ConActiveSessions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Security.AccessControl;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
@@ -9,9 +10,10 @@ namespace ErgometerDoctorApplication
 {
     public class ConActiveSessions : Panel
     {
-
+        public DataGridView data;
         public ConActiveSessions() : base()
         {
+            this.data = new DataGridView();
             this.labelActiveSessions = new System.Windows.Forms.Label();
             // 
             // ConActiveSessions

ErgometerDoctorApplication/ErgometerDoctorApplication.csproj

@@ -58,6 +58,9 @@
     <Compile Include="ChatItem.cs">
       <SubType>Component</SubType>
     </Compile>
+    <Compile Include="SessionTable.cs">
+      <SubType>Component</SubType>
+    </Compile>
     <Compile Include="ClientThread.cs" />
     <Compile Include="PanelClientChat.cs">
       <SubType>Component</SubType>

ErgometerDoctorApplication/SessionTable.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ErgometerDoctorApplication
+{
+    public class SessionTable : DataTable
+    {
+        public SessionTable() : base()
+        {
+            this.Columns.Clear();
+            this.Columns.Add("User", typeof (string));
+            this.Columns.Add("SessionId", typeof (string));
+        }
+    }
+}