I have just started with .NET programming and I had a question as to how I should go about doing this data manipulation.

Its a little hard to explain exactly what I want but bare with me.
What I have are documents that are formatted like so
Code:
Option
$Comment
Value        5.5  6.6  77
Value        3.0  .04  .90
DP            -2    3    4
Value        02   9     84
XPAR        34    55  33
...
Option
$Comment
...
This continues based on simulation that has been run. The data sets all start with Option.
What I want to do is scan through the document line by line (because I'm terrible with regular expressions) and search for "XPAR". If I find "XPAR" I need to delete that entire Option. That is I need to decriment and delete each line back up to Option and then skip foward to the next "Option" and continue to write to a new file.
So the new file will not have the data set "Option" where "XPAR" is found.

My idea was to read line by line into a temporary file until i found Xpar, then search back up and delete lines until i get to Option, skip to the next Option and continue to read line by line. This is the function that I have so far.
Code:
    Friend Sub import(ByVal strInputFile As String)
        Dim tmpFile As String = Path.GetTempFileName()
        Dim fsTemp As New FileStream(tmpFile, FileMode.Create)
        Dim sr As StreamReader = New StreamReader(strInputFile)
        Dim sw As StreamWriter = New StreamWriter(tmpFile)
        While sr.Peek() > -1
            sw.WriteLine(sr.ReadLine)
            If sr.ReadLine.Contains("CCONE") Then

            End If
        End While
        sr.Close()
        sw.Close()
        fsTemp.Close()
        File.Delete(tmpFile)
    End Sub
I don't know a whole lot about FileStreams, StreamReader/Writers so I don't really know how to go about scanning up and deleting while writing to the file.
Any suggestions or tips?