How to parse a flat file with C#

Question

I need to parse a flat file with data that looks like
01,1235,555
02,2135,558
16,156,15614
16,000,000
You get the idea. Anyway, I'd like to just used a derived column and move on except I need to put a line number on each row as it comes by so the end looks like,
1,01,1235,555
2,02,2135,558
3,16,156,15614
4,16,000,000
I'm trying to do with a script transformation but I can't seem to get the hang of the syntax. I've tried looking at various examples but everybody seems to prefer VB and I'd like to keep all of my packages C#. I've set up my input and my output columns I just
need to figure out how to write the code that says something like:
row_number = 1
line_number = row_number
record_type = input.split.get the second data element
data_point_1 = input.split.get the third data element
row_number = row_number ++

Answer 1

/* Microsoft SQL Server Integration Services Script Component
* Write scripts using Microsoft Visual C# 2008.
* ScriptMain is the entry point class of the script.*/
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;
[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
public class ScriptMain : UserComponent
private int rowCounter = 0;
// Method that will be started before the rows start to pass
public override void PreExecute()
base.PreExecute();
// Lock variable for read
VariableDispenser variableDispenser = (VariableDispenser)this.VariableDispenser;
variableDispenser.LockForRead("User::MaxID");
IDTSVariables100 vars;
variableDispenser.GetVariables(out vars);
// Fill the internal variable with the value of the SSIS variable
rowCounter = (int)vars["User::MaxID"].Value;
// Unlock variable
vars.Unlock();
// Method that will be started for each record in you dataflow
public override void Input0_ProcessInputRow(Input0Buffer Row)
// Seed counter
rowCounter++;
// Fill the new column
Row.MaxID = rowCounter;
Here is a script to get an incremental ID. On the ReadWriteVariables of the script add the "User::MaxID" variables to get the last number. On the Inputs and Outputs tab, create an output column  here in the code it's MaxID numeric data types.