Visual basic 2010, database – how to fill specific field - vb.net

Question

I'm creating database connection in Visual Basic. When user click on "borrow book" it transfer chosen data into table used for lent books. It all works alright, but I need last thing. In my database in lent table I have attribute "End date of lent" and I want fill it everytime when user borrow a book with date today + 1 month (for instance, if now is 19/04/2016, end date will be 19/05/2016). I created method "BorrowTime" for this, but I don't know what I should type into and how can I get value of inserted row into "row". And sorry for horrible look of code and form...
Public Class frm_UserView
Dim BooksSource As New BindingSource
Dim BorrowSource As New BindingSource
Dim BooksView As New DataView
Dim BorrowView As New DataView
Dim ds As New DataSet
Dim Borrow As Byte
Private Sub frm_UserView_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
tmr_Timer.Start()
Me.LoanerBooksTableAdapter.Fill(Me.GMITLibraryDataSet1.LoanerBooks)
Me.BooksTableAdapter.Fill(Me.GMITLibraryDataSet.Books)
BooksSource = dgd_UserBookView.DataSource
BooksView = CType(BooksSource.List, DataView)
ds = BooksView.DataViewManager.DataSet.Clone
BorrowSource.DataSource = ds
BorrowSource.DataMember = "Books"
BorrowView = CType(BorrowSource.List, DataView)
dgd_User_Borrow_View.DataSource = BorrowSource
End Sub
Private Sub btn_Borrow_Click(sender As System.Object, e As System.EventArgs) Handles btn_BorrowBook.Click
Borrow = 1
MoveBooks(dgd_UserBookView, BorrowView, Borrow)
dgd_User_Borrow_View.Sort(dgd_User_Borrow_View.Columns(0), System.ComponentModel.ListSortDirection.Ascending)
BorrowSource.MoveLast()
BorrowSource.MoveLast()
End Sub
Private Sub MoveBooks(ByRef source As DataGridView, ByRef target As DataView, ByRef borrow As Byte)
For i = 0 To source.SelectedRows.Count - 1
Dim numberOfRow As Integer
Dim row As DataRowView
row = target.AddNew()
Dim col As Int16 = 0
For Each cell As DataGridViewCell In source.SelectedRows(i).Cells
row.Item(col) = cell.Value
If borrow = 1 Then
numberOfRow = 0
BorrowTime(numberOfRow, dgd_User_Borrow_View)
End If
col = col + 1
Next
Next
Dim count As Int16 = source.SelectedRows.Count
For i = 0 To count - 1
source.Rows.RemoveAt(source.SelectedRows(0).Index)
Next
End Sub
Private Sub BorrowTime(ByRef row As Integer, ByRef dgd_Table As DataGridView)
'Code for adding date
End Sub
Private Sub btn_ReturnBook_Click(sender As System.Object, e As System.EventArgs) Handles btn_ReturnBook.Click
Borrow = 0
MoveBooks(dgd_User_Borrow_View, BooksView, Borrow)
dgd_UserBookView.Sort(dgd_UserBookView.Columns(0), System.ComponentModel.ListSortDirection.Ascending)
BooksSource.MoveLast()
BooksSource.MoveLast()
End Sub
Private Sub btn_UserLogOut_Click(sender As System.Object, e As System.EventArgs) Handles btn_UserLogOut.Click
frm_Login.Show()
Me.Hide()
End Sub
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles tmr_Timer.Tick
Dim countBooks As Integer
Dim countLent As Integer
countBooks = BooksSource.Count
countLent = BorrowSource.Count
lbl_BookCounter.Text = "There are " + countBooks.ToString + " books"
lbl_BorrowCounter.Text = "You have lent " + countLent.ToString + " books"
End Sub
End Class
I need to put code here:
Private Sub BorrowTime(ByRef row As Integer, ByRef dgd_Table As DataGridView)
'Code for adding date
End Sub
My form

Answer 1

Public Class frm_UserView
Dim BooksSource As New BindingSource
Dim BorrowSource As New BindingSource
Dim BooksView As New DataView
Dim BorrowView As New DataView
Dim ds As New DataSet
Dim Borrow As Byte
Private Sub frm_UserView_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
tmr_Timer.Start()
Me.LoanerBooksTableAdapter.Fill(Me.GMITLibraryDataSet1.LoanerBooks)
Me.BooksTableAdapter.Fill(Me.GMITLibraryDataSet.Books)
BooksSource = dgd_UserBookView.DataSource
BooksView = CType(BooksSource.List, DataView)
ds = BooksView.DataViewManager.DataSet.Clone
BorrowSource.DataSource = ds
BorrowSource.DataMember = "Books"
BorrowView = CType(BorrowSource.List, DataView)
dgd_User_Borrow_View.DataSource = BorrowSource
End Sub
Private Sub btn_Borrow_Click(sender As System.Object, e As System.EventArgs) Handles btn_BorrowBook.Click
Borrow = 1
MoveBooks(dgd_UserBookView, BorrowView, Borrow)
dgd_User_Borrow_View.Sort(dgd_User_Borrow_View.Columns(0), System.ComponentModel.ListSortDirection.Ascending)
BorrowSource.MoveLast()
BorrowSource.MoveLast()
End Sub
Private Sub MoveBooks(ByRef source As DataGridView, ByRef target As DataView, ByRef borrow As Byte)
For i = 0 To source.SelectedRows.Count - 1
Dim numberOfRow As Integer
Dim row As DataRowView
row = target.AddNew()
Dim col As Int16 = 0
For Each cell As DataGridViewCell In source.SelectedRows(i).Cells
row.Item(col) = cell.Value
If borrow = 1 Then
numberOfRow = 0
BorrowTime(numberOfRow, dgd_User_Borrow_View)
End If
col = col + 1
Next
Next
Dim count As Int16 = source.SelectedRows.Count
For i = 0 To count - 1
source.Rows.RemoveAt(source.SelectedRows(0).Index)
Next
End Sub
Private Sub BorrowTime(ByRef row As Integer, ByRef dgd_Table As DataGridView)
'Code for adding date
End Sub
Private Sub btn_ReturnBook_Click(sender As System.Object, e As System.EventArgs) Handles btn_ReturnBook.Click
Borrow = 0
MoveBooks(dgd_User_Borrow_View, BooksView, Borrow)
dgd_UserBookView.Sort(dgd_UserBookView.Columns(0), System.ComponentModel.ListSortDirection.Ascending)
BooksSource.MoveLast()
BooksSource.MoveLast()
End Sub
Private Sub btn_UserLogOut_Click(sender As System.Object, e As System.EventArgs) Handles btn_UserLogOut.Click
frm_Login.Show()
Me.Hide()
End Sub
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles tmr_Timer.Tick
Dim countBooks As Integer
Dim countLent As Integer
countBooks = BooksSource.Count
countLent = BorrowSource.Count
lbl_BookCounter.Text = "There are " + countBooks.ToString + " books"
lbl_BorrowCounter.Text = "You have lent " + countLent.ToString + " books"
End Sub
End Class