Use next, previous, pause button

[rachana.setty]

I wanted some help with vb.net code to use the previous, next and continue button. The program reads a text file and displays the info in textboxes on the form. It will then insert a new record into the sql database. It then moves to the next line on the text file. The problem is that the process is fast so the user does not get to see the details on the form before it moves to the next line. I want to be able to read one line, save to database and then pause to give the user time to read the information in the textboxes. They can then click the next button to read the next line in the text file and save to database. But I also wanted the functionality of being able to move to the next or previous record at anytime. Any ideas how to go about this?

[Begginnerdev]

What it sounds like you want is a dataset to use, or threaded process to upload.

The dataset being the easier of the two.

Private Function GetDataFromFile(ByVal sPath as String) As List(Of List( OfString))
    Try
        Dim sr As New StreamReader(sPath)
        Dim lstStrings As New List(Of List(Of String))

        Do While sr.Peek <> -1
            'This will split on the , characters.
            lstStrings.Add(sr.ReadLine.Split(",").ToList)
        End While

        Return lstStrings
    Catch ex As Exception
        MsgBox(ex.ToString)
        Return New List(Of String)
    End Try
End Function

Private Function FillDataSet(ByVal lstStrings As List(Of List(Of String))) As DataSet
    Try
        Dim da As New OleDBDataAdapter("SELECT * FROM MyTable",myCon) 'myCon is an OleDBConnection
        Dim ds As New DataSet

        da.Fill(ds,"myTable")

        If Not IsNothing(ds.Tables("myTable")) Then
            For i = 0 to lstStrings.Count - 1
                Dim dr As DataRow = ds.Tables("myTable").Rows.Add()

                'For columns that do not allow NULL
                dr("Column1") = IIF(IsDBNull(lstStrings(i)(0)),TrueValue,FalseValue)
                                                       '^ 1st column of the n'th list.
                'For columns that allow NULL
                dr("Column2") = lstStrings(i)(1) '2nd column of the n'th list.
            Next

            Return ds
        Else
            Return New DataSet
        End If
    Catch ex As Exception
        MsgBox(ex.ToString)
        Return New DataSet
    End Try
End Function

Now, with that being said, you will have a dataset containg all of the values you wanted to pass in and update.

To view them, just step through:

Dim iCurrentRecord As Integer = 0


Private Sub NextButton_Click(ByVal Sender As Object, ByVal e As EventArgs) Handles NextButton.Click
    Try
        If iCurrentRecord + 1 <= ds.Tables("myTable").Rows.Count - 1 Then
            LoadCurrent(iCurrentRecord + 1)
            iCurrentRecord += 1
        End If
    Catch ex As Exception
        MsgBox(ex.ToString)
    End Try
End Sub

Private Sub LoadCurrent(ByVal dr As DataRow)
    Try
        'Load your information controls here.
        'Example:
        NameTextBox.Text = dr("Name")
    Catch ex As Exception
        MsgBox(ex.Tostring)
    End Try
End Sub

To update - issue an update statement.

da.UpdateCommand = New OleDBCommandBuilder(da).GetUpdateCommand
da.Update(ds) 'ds will be the value returned from FillDataSet.