Data gets not saved?

Question

Hi
i am new at programming and also i am dutch so my english is not that high quality. sorry for that.
reading is a lot better than writing ;)
So here is my problem (i use visualstudio 2013 express)
my goal is to design a desktop app that keeps track of rented tv`s and Phones in a care home. (place where old people live)
i made 2 forms and 1 local database.
form1;
Public Class main
Private Sub AddTvToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles AddTvToolStripMenuItem.Click
add.Show()
End Sub
Private Sub main_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
End Class
form2;
Public Class add
Private Sub TelevisieBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs) Handles TelevisieBindingNavigatorSaveItem.Click
Me.Validate()
Me.TelevisieBindingSource.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.Database1DataSet)
End Sub
Private Sub add_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'Database1DataSet.Televisie' table. You can move, or remove it, as needed.
Me.TelevisieTableAdapter.Fill(Me.Database1DataSet.Televisie)
End Sub
Private Sub TelevisieDataGridView_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles TelevisieDataGridView.CellContentClick
End Sub
Private Sub TelevisieBindingNavigator_RefreshItems(sender As Object, e As EventArgs) Handles TelevisieBindingNavigator.RefreshItems
End Sub
End Class
now the problem is, when i debug all is working ok
it gives no errors, all data shows i can add and remove data etc. But when i close the main form (form1) and restart debug
it has lost all changes. so it is not saving the data. earlier when i had just 1 form it did. and i cant figer out why?
greets masters.

Answer 1

But when i close the main form (form1) and restart debug it has lost all changes. so it is not saving the data. earlier when i had just 1 form it did. and i cant figer out why?
That is correct. The data that you are using for debug should be the same each time you start a debugging session.  If it changes, you can't compare one debug session with the next, so you can't know what effect your code changes have had.  
Also, if there are errors in your code, you do not want invalid or incorrect data being stored into your database.
You can see some discussion of how to use data for debugging here:
https://msdn.microsoft.com/en-us/library/ms246989.aspx