need some help in simple script component transformation

/* 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;
using System.Windows.Forms;
[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
public class ScriptMain : UserComponent
{
    int test;
    public override void PreExecute()
    {
        base.PreExecute();
        /*
          Add your code here for preprocessing or remove if not needed
        */
    }
    public override void PostExecute()
    {
        base.PostExecute();
        /*
          Add your code here for postprocessing or remove if not needed
          You can set read/write variables here, for example:
          Variables.MyIntVar = 100
        */
     test = Variables.currentvalue;
    }
    public override void Input0_ProcessInputRow(Input0Buffer Row)
    {
        Row.nextvalue = test + 1;
        test++;
    }
}