write file need to optimised for heavy traffic

Question

i am very new to C#, and this is my first question, please be gentle on me

I am trying to write a application to capture some tick data from the data provider, below is

Answer 1

I would use String.Format:

using (StreamWriter writer = new StreamWriter(@"c:\log222.txt", true))
        {
            writer.AutoFlush = true;
            writer.Write(String.Format("{0},{1},{2},{3},{4},", myoutput.time.ToString(timeFmt), 
                myoutput.product, myoutput.type, myoutput.price, myoutput.volume);
        }

If you use @ before string you don't have to use double \.

This is much faster - you write only once to the file instead of 5 times. Additionally you don't use + operator with strings which is not the fastest operation ;)

Also - if this is multithreading application - you should consider using some lock. It would prevent application from trying to write to the file from eg. 2 threads at one time.