C#

//Method use to process incomming messages
public void GetMsg(IAsyncResult ar)
{
    int byteCount;
    try
    {
        //Get the number of Bytes received
        byteCount = (chatClient.GetStream()).EndRead(ar);
        //If bytes received is less than 1 it means
        //the server has disconnected
        if(byteCount <1)
        {
            //Close the socket
            Disconnect();
            MessageBox.Show("Disconnected!!");
            return;
        }
        //Send the Server message for parsing
        BuildText(recByte,0,byteCount);
        //Unless its the first time start Asynchronous Read
        //Again
        if(!firstTime)
        {
            AsyncCallback GetMsgCallback = new AsyncCallback(GetMsg);
            (chatClient.GetStream()).BeginRead(recByte,0,1024,GetMsgCallback,this);
                                firstTime = false;
        }
    }
    catch(Exception ed)
    {
        Disconnect();
        MessageBox.Show("Exception Occured :"+ed.ToString());
    }
}

//Method to Process Server Response
public void BuildText(byte[] dataByte, int offset, int count)
{
    //Loop till the number of bytes received
    for(int i=offset; i<(count); i++)
    {
        //If a New Line character is met then
        //skip the loop cycle
        if (dataByte[i] == 10)
        {
            Parse(myBuilder.ToString());
            //Empty the StringBuilder
            myBuilder = new System.Text.StringBuilder();
            continue;
        }
        //Add the Byte to the StringBuilder in Char format
        myBuilder.Append(Convert.ToChar(dataByte[i]));
    }
}

private void Parse(string message)
{
    string str = message.TrimEnd('\r');

    if(str != "")
    {
        string[] mes = str.Split('|');
        int id = Int32.Parse(mes[0]);
        switch (id)
        {
            //CUT: this renders the message based on the id
        }
    }
}

I overload my Form.Paint method
Form.Paint does a base.Paint();
the base form paint method then calls all the controls
each DataGridView.RowPrePaintEvent is fired and processes correctly.
since it is the first event I also execute the ugly code that is long and bulky
when base.Paint() returns, I can safely say I painted my form the first time and set my state to processed.