Hey, can you look at this mess please. 

Imports System.IO
Imports System.Globalization

Public Class frmMain

    ' Declare the context menu and items
    Private WithEvents addMenuItem, deleteMenuItem, moveUpMenuItem, moveDownMenuItem As ToolStripMenuItem
    Private clickedRowIndex As Integer

    ' Form constructor
    Public Sub New()
        ' This call is required by the designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.

        ' Initialize and add the context menu
        InitializeContextMenu()

        ' Initialize the DataGridView
        InitializeDataGridView()

        ' Set DataGridView Anchor
        DataGridView1.Anchor = AnchorStyles.Top Or AnchorStyles.Left Or AnchorStyles.Right Or AnchorStyles.Bottom

        ' Handle CellEndEdit event
        AddHandler DataGridView1.CellEndEdit, AddressOf DataGridView1_CellEndEdit

        ' Load data when the form loads (handled in frmMain_Load event)
    End Sub

    ' Handle the DataGridView Mouse Down event to get the row index on right-click
    Private Sub DataGridView1_MouseDown(sender As Object, e As MouseEventArgs) Handles DataGridView1.MouseDown
        If e.Button = MouseButtons.Right Then
            Dim hitTestInfo As DataGridView.HitTestInfo = DataGridView1.HitTest(e.X, e.Y)
            If hitTestInfo.Type = DataGridViewHitTestType.Cell Then
                clickedRowIndex = hitTestInfo.RowIndex
                DataGridView1.ClearSelection()
                DataGridView1.Rows(clickedRowIndex).Selected = True
            End If
        End If
    End Sub

    ' Event handler for CellEndEdit to update Total Time
    Private Sub DataGridView1_CellEndEdit(sender As Object, e As DataGridViewCellEventArgs)
        ' Ensure the edited cell is in either Start Time or Finish Time columns
        If e.RowIndex >= 0 AndAlso e.ColumnIndex >= 0 Then
            Dim currentRow As DataGridViewRow = DataGridView1.Rows(e.RowIndex)
            If IsTotalsRow(currentRow) Then
                ' Do not process totals row
                Return
            End If

            If e.ColumnIndex = DataGridView1.Columns("startTimeColumn").Index OrElse e.ColumnIndex = DataGridView1.Columns("finishTimeColumn").Index Then
                Dim startTimeStr As String = currentRow.Cells("startTimeColumn").Value?.ToString()
                Dim finishTimeStr As String = currentRow.Cells("finishTimeColumn").Value?.ToString()
                Dim startTime As DateTime
                Dim finishTime As DateTime

                ' Try parsing Start Time and Finish Time cell values
                If DateTime.TryParseExact(startTimeStr, "HH:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, startTime) AndAlso
                   DateTime.TryParseExact(finishTimeStr, "HH:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, finishTime) Then
                    ' Calculate Total Time
                    Dim totalTime As TimeSpan = finishTime - startTime
                    If totalTime.TotalMinutes < 0 Then
                        ' If totalTime is negative, add 24 hours (handles times past midnight)
                        totalTime = totalTime.Add(TimeSpan.FromHours(24))
                    End If
                    ' Update Total Time cell value
                    Dim totalHours As Integer = CInt(Math.Floor(totalTime.TotalHours))
                    Dim totalMinutes As Integer = totalTime.Minutes
                    currentRow.Cells("totalTimeColumn").Value = $"{totalHours}:{totalMinutes:D2}"
                Else
                    ' If parsing fails, clear the Total Time cell
                    currentRow.Cells("totalTimeColumn").Value = ""
                End If
            End If
        End If
    End Sub

    ' Initialize the context menu
    Private Sub InitializeContextMenu()
        ' Assign context menu to DataGridView
        DataGridView1.ContextMenuStrip = contextMenuMain

        ' Initially disable move up and move down menu items
        'moveUpMenuItem.Enabled = False
        'moveDownMenuItem.Enabled = False
    End Sub


    ' Event handler for adding a row
    Private Sub menuItemAddRow_Click(sender As Object, e As EventArgs) Handles menuItemAddRow.Click
        AddRow()
        UpdateMoveMenuItems() ' Ensure move menu items are updated
    End Sub


    ' Event handler for deleting a row
    Private Sub menuItemDeleteRow_Click(sender As Object, e As EventArgs) Handles menuItemDeleteRow.Click
        If clickedRowIndex >= 0 AndAlso clickedRowIndex < DataGridView1.Rows.Count Then
            Dim selectedRow As DataGridViewRow = DataGridView1.Rows(clickedRowIndex)
            If IsTotalsRow(selectedRow) Then
                MessageBox.Show("The totals row cannot be deleted.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                Return
            End If

            DataGridView1.Rows.RemoveAt(clickedRowIndex)
            UpdateTotals() ' Update totals after deletion
            UpdateMoveMenuItems()
        End If
    End Sub


    ' Event handler for moving a row up
    Private Sub menuItemMoveUp_Click(sender As Object, e As EventArgs) Handles menuItemMoveUp.Click
        If clickedRowIndex > 0 AndAlso clickedRowIndex < DataGridView1.Rows.Count Then
            Dim selectedRow As DataGridViewRow = DataGridView1.Rows(clickedRowIndex)
            If IsTotalsRow(selectedRow) Then
                Return ' Do not move the totals row
            End If

            Dim targetRow As DataGridViewRow = DataGridView1.Rows(clickedRowIndex - 1)
            If IsTotalsRow(targetRow) Then
                Return ' Do not move a row above the totals row
            End If

            DataGridView1.Rows.Remove(selectedRow)
            DataGridView1.Rows.Insert(clickedRowIndex - 1, selectedRow)
            DataGridView1.ClearSelection()
            DataGridView1.Rows(clickedRowIndex - 1).Selected = True
            clickedRowIndex -= 1
            UpdateMoveMenuItems()
        End If
    End Sub


    ' Event handler for moving a row down
    Private Sub menuItemMoveDown_Click(sender As Object, e As EventArgs) Handles menuItemMoveDown.Click
        If clickedRowIndex >= 0 AndAlso clickedRowIndex < DataGridView1.Rows.Count - 1 Then
            Dim selectedRow As DataGridViewRow = DataGridView1.Rows(clickedRowIndex)
            If IsTotalsRow(selectedRow) Then
                Return ' Do not move the totals row
            End If

            Dim targetRow As DataGridViewRow = DataGridView1.Rows(clickedRowIndex + 1)
            If IsTotalsRow(targetRow) Then
                Return ' Do not move a row below the totals row
            End If

            DataGridView1.Rows.Remove(selectedRow)
            DataGridView1.Rows.Insert(clickedRowIndex + 1, selectedRow)
            DataGridView1.ClearSelection()
            DataGridView1.Rows(clickedRowIndex + 1).Selected = True
            clickedRowIndex += 1
            UpdateMoveMenuItems()
        End If
    End Sub

    ' Event handler for duplicating a row
    Private Sub menuItemDuplicateRow_Click(sender As Object, e As EventArgs) Handles menuItemDuplicateRow.Click
        If clickedRowIndex >= 0 AndAlso clickedRowIndex < DataGridView1.Rows.Count Then
            Dim selectedRow As DataGridViewRow = DataGridView1.Rows(clickedRowIndex)
            If IsTotalsRow(selectedRow) Then
                MessageBox.Show("The totals row cannot be duplicated.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                Return
            End If

            ' Duplicate the selected row
            Dim newRow As DataGridViewRow = CType(selectedRow.Clone(), DataGridViewRow)

            ' Copy cell values
            For Each cell As DataGridViewCell In selectedRow.Cells
                newRow.Cells(cell.ColumnIndex).Value = cell.Value
            Next

            ' Insert the duplicated row below the selected row
            DataGridView1.Rows.Insert(clickedRowIndex + 1, newRow)
            UpdateTotals() ' Update totals after duplication
            UpdateMoveMenuItems() ' Update move menu items
        End If
    End Sub


    ' Method to update the status of move menu items
    Private Sub UpdateMoveMenuItems()
        If DataGridView1.CurrentCell IsNot Nothing Then
            Dim currentIndex As Integer = DataGridView1.CurrentCell.RowIndex
            Dim currentRow As DataGridViewRow = DataGridView1.Rows(currentIndex)

            If IsTotalsRow(currentRow) Then
                moveUpMenuItem.Enabled = False
                moveDownMenuItem.Enabled = False
            Else
                moveUpMenuItem.Enabled = (currentIndex > 0)
                moveDownMenuItem.Enabled = (currentIndex >= 0 AndAlso currentIndex < DataGridView1.Rows.Count - 1)
            End If
        Else
            moveUpMenuItem.Enabled = False
            moveDownMenuItem.Enabled = False
        End If
        SaveData()
    End Sub

    ' Event handler for DataGridView CellClick to update move menu items
    Private Sub DataGridView1_CellClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellClick
        If e.RowIndex >= 0 AndAlso e.RowIndex < DataGridView1.Rows.Count Then
            UpdateMoveMenuItems()
        End If
    End Sub

    ' Method to initialize DataGridView columns
    Private Sub InitializeDataGridView()
        ' Add columns to the DataGridView
        DataGridView1.Columns.Add("nameColumn", "Name")
        DataGridView1.Columns.Add("typeColumn", "Type")
        DataGridView1.Columns.Add("dateColumn", "Date")
        DataGridView1.Columns.Add("startTimeColumn", "Start Time")
        DataGridView1.Columns.Add("finishTimeColumn", "Finish Time")
        DataGridView1.Columns.Add("totalTimeColumn", "Total Time")
        DataGridView1.Columns.Add("amountColumn", "Amount")
        DataGridView1.Columns.Add("commentColumn", "Comment")

        ' Add a hidden column to identify the totals row
        Dim totalsFlagColumn As New DataGridViewTextBoxColumn()
        totalsFlagColumn.Name = "totalsFlagColumn"
        totalsFlagColumn.HeaderText = "IsTotalsRow"
        totalsFlagColumn.Visible = False ' Hide the column
        DataGridView1.Columns.Add(totalsFlagColumn)

        ' Set AutoSizeColumnsMode to Fill
        DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill

        ' Set the FillWeight to control the width of each column
        DataGridView1.Columns("nameColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("typeColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("dateColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("startTimeColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("finishTimeColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("totalTimeColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("amountColumn").FillWeight = 10 ' Adjust as needed
        DataGridView1.Columns("commentColumn").FillWeight = 30 ' Comment section should be the longest

        ' Set column types for date and time
        DataGridView1.Columns("dateColumn").ValueType = GetType(DateTime)
        DataGridView1.Columns("startTimeColumn").ValueType = GetType(String)
        DataGridView1.Columns("finishTimeColumn").ValueType = GetType(String)
        DataGridView1.Columns("totalTimeColumn").ValueType = GetType(String)
        DataGridView1.Columns("amountColumn").ValueType = GetType(Decimal)

        ' Make Total Time column read-only
        DataGridView1.Columns("totalTimeColumn").ReadOnly = True

        ' Disable automatic addition of new rows
        DataGridView1.AllowUserToAddRows = False

        ' Handle the CellValueChanged event
        AddHandler DataGridView1.CellValueChanged, AddressOf DataGridView1_CellValueChanged

        ' Disable automatic sorting for all columns
        For Each column As DataGridViewColumn In DataGridView1.Columns
            column.SortMode = DataGridViewColumnSortMode.Programmatic
        Next

        ' Handle the Sorted event
        AddHandler DataGridView1.Sorted, AddressOf DataGridView1_Sorted

        ' Handle the UserDeletingRow event
        AddHandler DataGridView1.UserDeletingRow, AddressOf DataGridView1_UserDeletingRow

        ' Handle the SelectionChanged event to deselect the totals row
        AddHandler DataGridView1.SelectionChanged, AddressOf DataGridView1_SelectionChanged
    End Sub

    ' Method to add a totals row to the DataGridView
    Private Sub AddTotalsRow()
        ' Move "Total" to the "Name" column (index 0)
        Dim totalsRow As String() = New String() {"Total", "", "", "", "", "0:00", "£0.00", "", "True"} ' Include the flag value
        DataGridView1.Rows.Add(totalsRow)
        Dim totalsRowView As DataGridViewRow = DataGridView1.Rows(DataGridView1.Rows.Count - 1)

        ' Set every cell in the totals row as read-only
        For Each cell As DataGridViewCell In totalsRowView.Cells
            cell.ReadOnly = True
        Next

        totalsRowView.DefaultCellStyle.BackColor = Color.LightGray ' Grey out the totals row
        totalsRowView.DefaultCellStyle.Font = New Font(DataGridView1.Font, FontStyle.Bold) ' Bold font for emphasis

        ' Set the totals row flag in the hidden column
        totalsRowView.Cells("totalsFlagColumn").Value = "True"
    End Sub
    ' Method to add a row to the DataGridView
    Private Sub AddRow()
        ' Example data to add
        Dim name As String = " "
        Dim type As String = " "
        Dim dateValue As DateTime = DateTime.Now ' Use current date
        Dim startTime As DateTime = DateTime.Now
        Dim finishTime As DateTime = DateTime.Now.AddHours(1)
        Dim totalTime As TimeSpan = finishTime - startTime
        Dim amount As Decimal = 0
        Dim comment As String = " "

        ' Create a row with the data
        Dim totalHours As Integer = CInt(Math.Floor(totalTime.TotalHours))
        Dim totalMinutes As Integer = totalTime.Minutes
        Dim totalTimeStr As String = $"{totalHours}:{totalMinutes:D2}"

        Dim row As String() = New String() {name, type, dateValue.ToString("d"), startTime.ToString("HH:mm"), finishTime.ToString("HH:mm"), totalTimeStr, "£" & amount.ToString("0.00"), comment, ""} ' Include empty value for totalsFlagColumn

        ' Insert the row before the totals row
        Dim insertIndex As Integer = DataGridView1.Rows.Count - 1 ' Index before the totals row
        DataGridView1.Rows.Insert(insertIndex, row)
    End Sub

    ' Method to save data
    Private Sub SaveData()
        ' Save data to a CSV file
        Using writer As New StreamWriter("data.csv")
            ' Write header
            writer.WriteLine("Name,Type,Date,Start Time,Finish Time,Total Time,Amount,Comment")
            ' Write rows
            For Each row As DataGridViewRow In DataGridView1.Rows
                ' Skip the totals row
                If Not IsTotalsRow(row) Then
                    Dim name = If(row.Cells("nameColumn").Value, "").ToString()
                    Dim type = If(row.Cells("typeColumn").Value, "").ToString()

                    ' Format date as short date string
                    Dim dateValueObj = row.Cells("dateColumn").Value
                    Dim dateValue As String = ""
                    If dateValueObj IsNot Nothing Then
                        Dim dt As DateTime
                        If DateTime.TryParse(dateValueObj.ToString(), dt) Then
                            dateValue = dt.ToString("d")
                        Else
                            dateValue = dateValueObj.ToString()
                        End If
                    End If

                    Dim startTime = If(row.Cells("startTimeColumn").Value, "").ToString()
                    Dim finishTime = If(row.Cells("finishTimeColumn").Value, "").ToString()
                    Dim totalTime = If(row.Cells("totalTimeColumn").Value, "").ToString()
                    Dim amount = If(row.Cells("amountColumn").Value, "").ToString()
                    Dim comment = If(row.Cells("commentColumn").Value, "").ToString()

                    writer.WriteLine($"{name},{type},{dateValue},{startTime},{finishTime},{totalTime},{amount},{comment}")
                End If
            Next
        End Using
    End Sub

    ' Method to load data
    Private Sub LoadData()
        ' Clear existing rows
        DataGridView1.Rows.Clear()

        ' Check if the file exists
        If File.Exists("data.csv") Then
            Using reader As New StreamReader("data.csv")
                ' Read header line
                Dim header As String = reader.ReadLine()

                ' Read rows
                While Not reader.EndOfStream
                    Dim line As String = reader.ReadLine()
                    Dim values As String() = line.Split(","c)
                    If values.Length < 8 Then
                        Continue While ' Skip invalid rows
                    End If

                    ' Add an empty string for the totalsFlagColumn
                    Dim extendedValues As String() = New String(8) {}
                    Array.Copy(values, extendedValues, values.Length)
                    extendedValues(8) = "" ' Empty flag

                    DataGridView1.Rows.Add(extendedValues)
                End While
            End Using
        End If

        ' After loading data, add totals row and update totals
        AddTotalsRow()
        UpdateTotals()
    End Sub

    ' Event handler for cell value changes
    Private Sub DataGridView1_CellValueChanged(sender As Object, e As DataGridViewCellEventArgs)
        If e.RowIndex >= 0 AndAlso e.RowIndex < DataGridView1.Rows.Count Then
            Dim currentRow As DataGridViewRow = DataGridView1.Rows(e.RowIndex)

            ' Make sure we're not on the totals row
            If IsTotalsRow(currentRow) Then
                Return
            End If

            ' Update Total Time if Start Time or Finish Time changed
            If e.ColumnIndex = DataGridView1.Columns("startTimeColumn").Index OrElse e.ColumnIndex = DataGridView1.Columns("finishTimeColumn").Index Then
                DataGridView1_CellEndEdit(sender, e)
            End If
            ' Update totals
            UpdateTotals()
            ' Save data
            SaveData()
        End If
    End Sub

    ' Method to update totals in the totals row
    Private Sub UpdateTotals()
        Dim totalDuration As TimeSpan = TimeSpan.Zero
        Dim totalAmount As Decimal = 0D

        For Each row As DataGridViewRow In DataGridView1.Rows
            If IsTotalsRow(row) Then
                Continue For
            End If

            ' Calculate total time
            Dim totalTimeStr As String = row.Cells("totalTimeColumn").Value?.ToString()
            Dim totalTime As TimeSpan
            If TimeSpan.TryParseExact(totalTimeStr, "%h\:mm", CultureInfo.InvariantCulture, TimeSpanStyles.None, totalTime) Then
                totalDuration += totalTime
            End If

            ' Calculate total amount
            Dim amountStr As String = row.Cells("amountColumn").Value?.ToString().Replace("£", "")
            Dim amount As Decimal
            If Decimal.TryParse(amountStr, amount) Then
                totalAmount += amount
            End If
        Next

        ' Update totals row
        Dim totalsRow As DataGridViewRow = GetTotalsRow()
        If totalsRow IsNot Nothing Then
            Dim totalHours As Integer = CInt(Math.Floor(totalDuration.TotalHours))
            Dim totalMinutes As Integer = totalDuration.Minutes

            ' Display total hours and minutes, including hours over 24
            totalsRow.Cells("totalTimeColumn").Value = $"{totalHours}:{totalMinutes:D2}"
            totalsRow.Cells("amountColumn").Value = "£" & totalAmount.ToString("0.00")
        End If
    End Sub

    ' Event handler for Sorted event
    Private Sub DataGridView1_Sorted(sender As Object, e As EventArgs)
        ' Move totals row to the bottom
        Dim totalsRow As DataGridViewRow = GetTotalsRow()
        If totalsRow IsNot Nothing Then
            DataGridView1.Rows.Remove(totalsRow)
            DataGridView1.Rows.Add(totalsRow)
        End If
    End Sub

    ' Event handler for UserDeletingRow to prevent deletion of the totals row
    Private Sub DataGridView1_UserDeletingRow(sender As Object, e As DataGridViewRowCancelEventArgs)
        If IsTotalsRow(e.Row) Then
            MessageBox.Show("The totals row cannot be deleted.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            e.Cancel = True ' Cancel the deletion
        End If
    End Sub

    ' Event handler for SelectionChanged to deselect the totals row
    Private Sub DataGridView1_SelectionChanged(sender As Object, e As EventArgs) Handles DataGridView1.SelectionChanged
        If DataGridView1.CurrentRow IsNot Nothing AndAlso IsTotalsRow(DataGridView1.CurrentRow) Then
            ' Deselect the totals row
            DataGridView1.CurrentCell = Nothing
        End If
    End Sub

    ' Helper method to check if a row is the totals row
    Private Function IsTotalsRow(row As DataGridViewRow) As Boolean
        Return row.Cells("totalsFlagColumn").Value IsNot Nothing AndAlso row.Cells("totalsFlagColumn").Value.ToString() = "True"
    End Function

    ' Helper method to get the totals row
    Private Function GetTotalsRow() As DataGridViewRow
        For Each row As DataGridViewRow In DataGridView1.Rows
            If IsTotalsRow(row) Then
                Return row
            End If
        Next
        Return Nothing
    End Function

    ' Event handler for form load
    Private Sub frmMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        LoadData()
    End Sub

End Class

Originally, the contextmenustrip was added in the code. I've gone ahead and added the contextmenu to the form to make it easier. But the code is now a mess as it references both. I only want it to reference the one I just put on the form. The correct variables etc are the following

For the ContextMenu on the form: contextMenuMain

For menu items: menuItemAddRow, menuItemDeleteRow, menuItemMoveUp, menuItemMoveDown, menuItemDuplicateRow