Replace A Row In A File Using .net?

Jul 18, 2011

I have a csv file which have data like this:

Date,val1,val2,val3,val4,val5,val6,.......val47,val48
18/07/2011,0,0,0,10.98,0,0,0,10.98,10.98,0,0,0,0,0....,0,0

Now i need to compare the date value of existing row with new row's date value. If equal then need to replace the exisiting row with new row. If not append the existing row. I tried in follwing way. If dates are not equal, the new row is getting added but if dates are equal could not able to replace the existing row. Any suggestions please?????

Imports System.IO
Public Class Form1

[code]....

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