Changes in Datagridview not saving in table SQLite vb.net - vb.net

Question

I'm trying to save changes made to datagridview into the table tbl_invent, the changes i make commits to datagridview but it does not save to the table (database), also it doesn't have any error, all i received is a message saying "Records Updated = 0". anyone could point me to the right direction?
Dim da As New SQLiteDataAdapter("select * from tbl_Invent", connection)
Dim ds As New DataSet
'Dim cmdbuilder As New SQLite.SQLiteCommandBuilder(da)
Dim i As Integer
da.TableMappings.Add("tbl_Invent", "tbl_Invent") 'add due to error unable to Update unable to find TableMapping['Table'] or DataTable 'Table'
Try
i = da.Update(ds, "tbl_Invent")
MsgBox("Records Updated= " & i)
Catch ex As Exception
MsgBox(ex.Message)
End Try
connection.Close()
i already check out this thread:
How to save changes from DataGridView to the database?
-and-
Datagridview save changes to Database vb.net
thank you very much in advance.

Answer 1

It should be obvious that you're not going to save any changes if you don't make any changes between creating/populating your DataTable and trying to save the changes. You need to create the DataTable, populate it and bind it in one method (probably the Load event handler of the form), then the user makes the changes, then you save the changes from the same DataTable in another method (probably the Click event handler of a Button. E.g.
Private table As New DataTable
Private adapter As New SqlDataAdapter("SQL query here", "connection string here")
Private builder As New SqlCommandBuilder(adapter)
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
adapter.Fill(table)
BindingSource1.DataSource = table
DataGridView1.DataSource = BindingSource1
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
BindingSource1.EndEdit()
adapter.Update(table)
End Sub
The DataTable is created when the form is, the user makes the changes in the grid and clicks the Button and then you save the changes from THE SAME DataTable, not a new one that you just created that contains no changes.