Read and write below a precise cell in a CSV - vb.net

Question

I'm stuck on a basic problem. What I want is to parse through a CSV in order to compare some string and write below if I find it.
Precisely, I have a programe where I can drag and drop some button, when I drop this button I want to save it's new location on the first empty cells below the corresponding column.
Here's a sample of my CSV :
So I substring the .x/.y from my CSV and compare the name from the drop button with each cell with the help of textFieldParser. It seems to work my loop stopped when it find an equal expression.
But here's the problem I don't know how to say to my program to write below it. The first reason I can figured it out is because my parser go until the endOfData and I want it to go until the endOfDat + one row.
The second one is because I don't know if I can use a fieldwriter into textFieldParser, I mean I tried to create a variable with row+1 and write below but nothing happen when I use fileWriter.
now a sample of my code :
Private Sub manageCsv(ByVal sender As Button)
Using MyReader As New Microsoft.VisualBasic.FileIO.TextFieldParser("..\..\Pic\csvPic.csv")
MyReader.TextFieldType = FileIO.FieldType.Delimited
MyReader.SetDelimiters(",")
Dim currentRow As String()
Dim rowPlusOne As String()
While Not MyReader.EndOfData
Try
currentRow = MyReader.ReadFields()
rowPlusUn = MyReader.ReadFields()
Dim currentField As String
Dim str As String = btnSender.Name.Substring(3)
Dim nameDelimited As String
Dim x As Integer
For Each currentField In currentRow
''Search the corresponding field''
x = InStr(currentField, ".")
If Not (currentField.Equals("imagefile")) Then ''imagefile is the first index of my csv''
nameDelimited = currentField.Substring(0, x) ''substr the extension''
If nameDelimited.Equals(str) Then
writeCsv("..\..\Image\csvPic.csv", nameDelimited, ",")
''Ofc the "+1" does not work but that was the idea''
currentRow(+1) = lblImgName.Text
currentRow(+1) = btnSender.Location.ToString
Exit For
End If
End If
Next
Catch ex As _
Microsoft.VisualBasic.FileIO.MalformedLineException
MsgBox("Line " & ex.Message & "is not valid and will be skipped.")
End Try
End While
End Using
End Sub
I hope it's clear enough, if not i'll try to elaborate more. Thanks for your help

Answer 1

Show your teacher that there are better ways to do this with a simple text file. The file will only exist if buttons have been moved before in the application. See in line comments.
Private ButtonLocation As New Dictionary(Of Button, Point)
Private MouseIsDown As Boolean
Private ptX, ptY As Integer 'Starting point of mouse relative to the button
Private btn As Button 'The button being moved
Private ButtonPath As String = "C:\Users\maryo\Desktop\Code\DroppedButtons.txt"
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'Reposition the buttons to where they were dropped in the previous session.
If File.Exists(ButtonPath) Then
Dim lines = File.ReadAllLines(ButtonPath) 'returns an array of strings (each line)
For Each line In lines 'loop though each line in the file
Dim fields = line.Split(","c) 'The three values on the line are separated by a comma
Dim b = DirectCast(Controls(fields(0)), Button) 'Change the string Button.Name
'to an actual Button object by finding it in the controls collection
'Set the location with the next 2 values on the line
b.Location = New Point(CInt(fields(1)), CInt(fields(2)))
'Add the Button and Location to the list
ButtonLocation.Add(b, b.Location)
Next
End If
End Sub
'These three Event procedures are the normal code to Drag and Drop a control
Private Sub Button_MouseDown(sender As Object, e As MouseEventArgs) Handles Button1.MouseDown, Button2.MouseDown
btn = DirectCast(sender, Button)
ptX = e.Location.X
ptY = e.Location.Y
MouseIsDown = True
End Sub
Private Sub Button_MouseMove(sender As Object, e As MouseEventArgs) Handles Button1.MouseMove, Button2.MouseMove
If MouseIsDown Then
'e.X and e.Y are the coordinates of the Mouse relative to the control (the Button)
'not the Form or the Screen.
btn.Location = New Point(btn.Location.X + e.X - ptX, btn.Location.Y + e.Y - ptY)
End If
End Sub
Private Sub Button_MouseUp(sender As Object, e As MouseEventArgs) Handles Button1.MouseUp, Button2.MouseUp
MouseIsDown = False
'When we drop the button with the MouseUp event we record the new location in the list
RecordButtonLocation(btn, btn.Location)
btn = Nothing
End Sub
Private Sub RecordButtonLocation(Sender As Button, Location As Point)
'Check if the Button is already in the list
If ButtonLocation.ContainsKey(Sender) Then
'Record its new location
ButtonLocation.Item(Sender) = Location
Else
'If it is not in the list add it.
ButtonLocation.Add(Sender, Location)
End If
End Sub
Private Sub Form1_Closing(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles Me.Closing
SaveDictionary()
End Sub
Private Sub SaveDictionary()
If ButtonLocation.Count > 0 Then
'If there is anything in the list we will create or overwrite the file
Dim sb As New StringBuilder
For Each kv As KeyValuePair(Of Button, Point) In ButtonLocation
sb.AppendLine($"{kv.Key.Name},{kv.Value.X},{kv.Value.Y}")
Next
File.WriteAllText(ButtonPath, sb.ToString)
End If
End Sub