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  #1 (permalink)  
Old December 1st, 2005, 05:46 PM
mh mh is offline
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Default Editing a Text File


I'm trying to change the date in a text file to 14 days later once a button is clicked. The following is my code. It does not seem to do anything at all. Can someone please tell me what is going on? Thank you very much.

Imports System
Imports System.IO
Public Class WebForm1
    Inherits System.Web.UI.Page

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
            Dim Days As Double
            Dim IntervalType As DateInterval
            Dim SecondDate As Date
            IntervalType = DateInterval.Day
            Days = 14
            ' Create an instance of StreamReader to read from a file.
            Dim sr As StreamReader = New StreamReader("C:\Inetpub\wwwroot\CPS3\FIDELITY0921 2005.txt")
            Dim sw As StreamWriter = New StreamWriter("C:\Inetpub\wwwroot\CPS3\FIDELITY0921 2005.txt")
            Dim line, dt, newdate As String
            Dim i As Integer
            line = sr.ReadLine()
            line = sr.ReadLine()
            ' Add some text to the file.
            sr.BaseStream.Seek(65, 71)
            For i = 0 To 6
                dt = sr.Read.ToString
                If i = 0 Then
                    SecondDate = dt
                    SecondDate = SecondDate & dt
                End If
            newdate = DateAdd(IntervalType, Days, CDate(SecondDate))
            sw.BaseStream.Seek(65, 71)
            ' Let the user know what went wrong.
            Console.WriteLine("The file could not be read:")
        End Try
    End Sub
End Class

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  #2 (permalink)  
Old December 8th, 2005, 02:37 AM
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When you open a file with StreamWriter mode its basically for file writing so if there is a file with that name it deletes the contents in it.

So what you need to do is use StreamWriter with a different file name say "FIDELITY09212005_bak.txt" and then at the end rename the file to "FIDELITY09212005.txt".

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