Inserting text at the beginning of a text file

[jlegan]

Ok,

Todays questions of the day is two fold.

1) I need to insert a line of text into the begining of an already existing document but Append of course puts it at the end, how do you get it at the beginning.

2) My code is below for the problem I am having with #1. What is the .NET way of doing what I am trying to do?

Private Sub Modify_Logon_Script()
 
Dim logonscript As String
Dim logonscript_template As String
 
        ' Defines the logonscript and template.
        logonscript_template = "logon.template"
        logonscript = "data\logon.vbs"
        ' Grabs the share path from the text box and sets up the variable
        strSharePath = ("strShareName = " & """" & txtSharePath.Text & """")
        ' Copies the template for the logon script to the data directory
        FileCopy(strPath & "xrxlogon.template", strDataPath & "xrxlogon.vbs")
        ' Opens the logon script for editing
        FileOpen(5, logonscript, OpenMode.Append)
        ' Writes the share path to the logon script
        Print(5, strSharePath)
        ' Closes the logon script
        FileClose(5)
 
    End Sub ' Modifies the logon script with the correct path name

[jlegan]

Any thoughts,

[Edneeis]

Where are strPath and strSharePath coming from? I see them in the method but not declared in it?

[ggprogram]

The only way I know of to add data to the beginning of a file is to open a _new_ file, write the new data, then read each line of the old file and write it to the new file. When you are done, you can erase the old file and rename the new file with the appropriate name.

[Edneeis]

This will insert text in the front of a file:

Dim sr As New IO.StreamReader(New IO.FileStream("c:\end.txt", IO.FileMode.Open))
        Dim text As String = sr.ReadToEnd
        sr.Close()
        Dim sw As New IO.StreamWriter(New IO.FileStream("c:\end.txt", IO.FileMode.Open))
        sw.WriteLine("Inserted in the front!")
        sw.Write(text)
        sw.Close()

[ggprogram]

That will work, but if you have an error while writing you won't be able to repeat the attempt later becuase you will have overwritten the original file I would suggest writing to a new file and killing the old only after the write is complete.

[Edneeis]

If it fails then the contents of the file are in the text variable. Also depending on what the error is the contents may not be lost.