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          //split message into Array
          if (clientmessage.StartsWith("=pg"))
          {
               //Replace the "=pg"
               clientmessage = clientmessage.Replace("=pg.", "");
               //split string to Array
               commands = clientmessage.Split('.');
               keyword = commands[0];
             
               for (int i = 0; i < Liste.GetLength(0); i++)
               {
                   //check if we found the Mac-Adress from the Client
                   Position = Position + 1;

                   if (keyword == Liste[Position - 1, 0])
                   {
                       //Now set the new progress and send it to the client
                       Liste[Position - 1, 0] = commands[0];
                       Liste[Position - 1, 1] = commands[1];
                       Zahl = Zahl + 1;
                       found = true;
                       pg = commands[1];
                       Byte[] sendBytes = System.Text.Encoding.UTF8.GetBytes(pg);
                       clientStream.Write(sendBytes, 0, sendBytes.Length);
                       break;
                   }
               }

               if (found == false)
               {
                  //Create a new entry with the Mac-Adress an the progress and send it to the client.
                  Liste[Zahl, 0] = commands[0];
                  Liste[Zahl, 1] = commands[1];
                  found = false;
                  Position = 0;
                  pg = commands[1];
                  Byte[] sendBytes = System.Text.Encoding.UTF8.GetBytes(pg);
                  clientStream.Write(sendBytes, 0, sendBytes.Length);
               }
          }					

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if (keyword == Liste[Position - 1, 0])					

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for (int i = 0; i < Liste.GetLength(0); i++)
{
    //check if we found the Mac-Adress from the Client
    if (keyword == Liste[i, 0])
    {
        // ...
    }
}					

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Socket Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                    Socket.Connect(IP, 900);                                                            //Client IP
                    Socket.Send(System.Text.Encoding.UTF8.GetBytes(TextBox1.Text));