Database, Dataset, Table Adaptors Error "Unable to load, Update requires a valid DeleteCommand when passed DataRow collection with deleted row"

Question

Microsoft Visual Basic 2010 Express.
I am new to Visual Basic programing and i am trying to understand the relationships between Datasets, database, table Adaptors. I have to following code that is is giving me the following error" Unable to load, Update requires a valid DeleteCommand
when passed DataRow collection with deleted rows". 
I can track the error and its located in "OffsetTableTableAdapter.Update(MaterionOffsetDataSet.OffsetTable)" code. What am i missing?
It seems that i can delete the data on the DataGridView Table and it only displays the correct data. but my database is not updating, even though the data grid displays differently.I can determine this because, when i save the offset database, i have all
the previous uploads and all the rows that i wanted to delete are still there.
My final goal is to be able to import offset data from a CSV file, save this data on the pc, send a copy of this data to a NuermicUpDown so the customer can modify certain numbers. From here they download all the date to a controller.  IF the customer
needs to modify the imported data, they can go to a tab with a data grid view and modify the table. They will also have to option to save the modified data into a csv file.  
Im not sure if i am making this overcomplicated or if there is a easier way to program this.
CODE:
Private Function LoadOffSetData()
        Dim LoadOffsetDialog As New OpenFileDialog 'create a new open file dialog and setup its parameters
        LoadOffsetDialog.DefaultExt = "csv"
        LoadOffsetDialog.Filter = "csv|*.csv"
        LoadOffsetDialog.Title = "Load Offset Data"
        LoadOffsetDialog.FileName = "RollCoaterOffset.csv"
        If LoadOffsetDialog.ShowDialog() = Windows.Forms.DialogResult.OK Then  'show the dialog and if the result is ok then
            Try
                Dim myStream As New System.IO.StreamReader(LoadOffsetDialog.OpenFile) 'try to open the file with a stream reader
                If (myStream IsNot Nothing) Then 'if the file is valid
                    For Each oldRow As MaterionOffsetDataSet.OffsetTableRow In MaterionOffsetDataSet.OffsetTable.Rows
                        oldRow.Delete()                       
'delete all of the existing rows
                    Next
                    'OffsetTableTableAdapter.Update(MaterionOffsetDataSet.OffsetTable)
                    Dim rowvalue As String
                    Dim cellvalue(25) As String
                    'Reading CSV file content
                    While myStream.Peek() <> -1
                        Dim NRow As MaterionOffsetDataSet.OffsetTableRow
                        rowvalue = myStream.ReadLine()
                        cellvalue = rowvalue.Split(","c) 'check what is ur separator
                        NRow = MaterionOffsetDataSet.OffsetTable.Rows.Add(cellvalue)
                        Me.OffsetTableTableAdapter.Update(NRow)
                    End While
                    Me.OffsetTableTableAdapter.Update(MaterionOffsetDataSet.OffsetTable)
                    MainOffset.Value = OffsetTableTableAdapter.MainOffsetValue          'saves all the table offsets
to the offset numericUpDown registers in the main window
                    StationOffset01.Value = OffsetTableTableAdapter.Station01Value
                    StationOffset02.Value = OffsetTableTableAdapter.Station02Value
                   myStream.Close() 'close the stream
                    Return True
                Else 'if we were not able to open the file then
                    MsgBox("Unable to load, check file name and location") 'let the operator know that the file wasn't able to open
                    Return False
                End If
            Catch ex As Exception
                MsgBox("Unable to load, " + ex.Message)
                Return False
            End Try
        Else
            Return False
        End If
    End Function

Answer 1

Hello SaulMTZ,
>>I can track the error and its located in "OffsetTableTableAdapter.Update(MaterionOffsetDataSet.OffsetTable)" code. What am i missing?
This error usually shows that you do not initialize the
DeleteCommand object, you could check this
article to see if you get a workaround.
>> Im not sure if i am making this overcomplicated or if there is a easier way to program this.
If you are working CSV file, you could use OleDB to read it which would treat the CSV file as a Table:
http://www.codeproject.com/Articles/27802/Using-OleDb-to-Import-Text-Files-tab-CSV-custom
which seems to be easier (in my opinion).
Regards.
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