Socket programming using TcpListener and tcpClient

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C#

Hello,

supose there crore of byte avalable on a port.
when we call

_client.Client.BeginReceive(_recieveBuffer, 0, 1024, SocketFlags.None, new AsyncCallback(OnBytesRecieved), null);

and after it we say

_client.Client.EndRecieve()

then we get some bytes stored in _recievBuffer its ok

now if next time again calling

_client.Client.BeginReceive(_recieveBuffer, 0, 1024, SocketFlags.None, new AsyncCallback(OnBytesRecieved), null);

and

TcpClient.Endrecieve()

so here againt may i get same data whatever we have recieved?????
or it stars reading from beginning and after each recieve pointer moved next??