Vb.net Journal Program Issue - vb.net

Question

Okay so for an internship project i'm making a Journal with streamwriters and streamreaders.
I have to to where you can create an account with a name, Username, and Password. I also have it to where it creates a txt file in that persons name when you create the account. Now, they login and it brings them to the journal page. The Journal Page for the most part has a Date for your journal Entry, the title of the journal and the journal entry text itself.
The problem that I am having is that when you click the button to create/edit a journal entry, it goes through a sub routine that checks if that journal exists (Meaning that there is already one for that date) or not. If it doesn't exist, then it should create a new one at the bottom of the text file. If it does exist then it should edit the lines in which that journal are stationed in the text file.
Code:
Private Sub CreateBtn_Click(sender As System.Object, e As System.EventArgs) Handles CreateBtn.Click
Errors = ""
Dim TempCounter As Integer = 0
If TitleTxt.Text = "" Then
Errors = "You must enter a title." & vbCrLf
End If
If JournalTextRtxt.Text = "" Then
Errors &= "You must enter an entry for the journal."
End If
If Errors <> "" Then
MessageBox.Show("There's an error in creating/editing your journal." & vbCrLf & "Error(s):" & vbCrLf & Errors, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
Else
JournalDate = DateTimePicker1.Value
JournalTitle = TitleTxt.Text
JournalText = JournalTextRtxt.Text
arrJournalEntries(TempCounter).TheDate = JournalDate
arrJournalEntries(TempCounter).Title = JournalTitle
arrJournalEntries(TempCounter).JournalEntry = JournalText
CheckAndWrite()
End If
End Sub
Private Sub CheckAndWrite()
Dim Reader As New StreamReader(MyName & ".txt", False)
Dim Sline As String = Reader.ReadLine
Counter = 0
Do Until (Sline Is Nothing) 'Perform the code until the line in the text file is blank
If Not Sline Is Nothing Then 'If the line in the text file is NOT blank then
For i As Integer = 1 To 3
Select Case i
Case 1
arrJournalEntries(Counter).TheDate = Sline
Sline = Reader.ReadLine
Case 2
arrJournalEntries(Counter).Title = Sline
Sline = Reader.ReadLine
Case 3
arrJournalEntries(Counter).JournalEntry = Sline
Sline = Reader.ReadLine
End Select
Next
End If
JournalDate = arrJournalEntries(Counter).TheDate
Time = DateTimePicker1.Value
MsgBox("Journal Date = " & JournalDate & vbCrLf & "Today's Date = " & Time)
If Time = JournalDate Then
JournalFound = True
Else
Counter += 1
JournalFound = False
End If
Loop
Reader.Close()
Try
If Sline Is Nothing Or JournalFound = False Then
MsgBox("Your journal is now going to be created.")
JournalDate = DateTimePicker1.Value
JournalTitle = TitleTxt.Text
JournalText = JournalTextRtxt.Text
arrJournalEntries(Counter).TheDate = JournalDate
arrJournalEntries(Counter).Title = JournalTitle
arrJournalEntries(Counter).JournalEntry = JournalText
Dim Writer As New StreamWriter(MyName & ".txt", True)
Do Until (arrJournalEntries(Counter).TheDate = Nothing)
Writer.WriteLine(arrJournalEntries(Counter).TheDate)
Writer.WriteLine(arrJournalEntries(Counter).Title)
Writer.WriteLine(arrJournalEntries(Counter).JournalEntry)
Counter += 1
Loop
Writer.Close()
End If
If JournalFound = True Then
MsgBox("Your journal is now going to be edited.")
JournalDate = DateTimePicker1.Value
JournalTitle = TitleTxt.Text
JournalText = JournalTextRtxt.Text
arrJournalEntries(Counter).TheDate = JournalDate
arrJournalEntries(Counter).Title = JournalTitle
arrJournalEntries(Counter).JournalEntry = JournalText
Dim Writer As New StreamWriter(MyName & ".txt", True)
Do Until (arrJournalEntries(Counter).TheDate = Nothing)
Writer.WriteLine(arrJournalEntries(Counter).TheDate)
Writer.WriteLine(arrJournalEntries(Counter).Title)
Writer.WriteLine(arrJournalEntries(Counter).JournalEntry)
Counter += 1
Loop
Writer.Close()
End If
Catch ex As Exception
MessageBox.Show("An error has occured" & vbCrLf & vbCrLf & "Original Error:" & vbCrLf & ex.ToString)
End Try
End Sub`
The problem that's occuring is that it's not only writing in the first time wrong. When it's supposed to say it's going to edit, it doesn't, it just says creating. But it just adds on to the file. After pressing the button 3 times with the current date. and the Title being "Test title", and the journal entry text being "Test text". This is what occured.
It should just be
7/10/2012 3:52:08 PM
Test title
Test text
7/10/2012 3:52:08 PM
Test title
Test text
the whole way through. but of course if it's the same date then it just overwrites it. So can anybody please help me?

Answer 1

You are only filtering your array by the date, so it looks like you have an object with a date but no title or text:
Do Until (arrJournalEntries(Counter).TheDate = Nothing)
The "quick" fix:
Do Until (arrJournalEntries(Counter).TheDate = Nothing)
If arrJournalEntries(Counter).Title <> String.Empty Then
Writer.WriteLine(arrJournalEntries(Counter).TheDate)
Writer.WriteLine(arrJournalEntries(Counter).Title)
Writer.WriteLine(arrJournalEntries(Counter).JournalEntry)
End If
Counter += 1
Loop
Do consider getting rid of the array and using a List(of JournalEntry) instead. Your code looks difficult to maintain in its current state.