How to update the database in MVC?

Why doesn't my original database update when I edit the datagridview in VB 2008?

• I had followed a tutorial on how to connect to an existing MS Access database using VB 2008. I was able to open the data source and drag the datagrid onto the form which created all the necessary adapters including the bindingsourcenavigator. In the tutorial with their existing tables, I was able to edit the datagridview on the form and click the "save" button on the navigator and see the records updated in the Access database. I created my own database and performed the same operations on my form and when I click save, the records do not update. This is the tutorial's code: Public Class Form1 --------------------------------------… Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.ClassesTableAdapter.Fill(Me.StudentsD… Me.InstructorsTableAdapter.Fill(Me.Stude… End Sub --------------------------------------… Private Sub SaveToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripButton.Click Me.InstructorsTableAdapter.Update(Me.Stu… End Sub --------------------------------------… End Class ______________________________________… This is my code from my project: Public Class Main --------------------------------------… Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEve… End Sub --------------------------------------… Private Sub Main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.Fire_AttendanceTableAdapter.Fill(Me.F… EntryForm.Visible = False End Sub --------------------------------------… Private Sub btnAddEntry_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddEntry.Click EntryForm.Focus() EntryForm.Visible = True End Sub --------------------------------------… Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click Me.Fire_AttendanceTableAdapter.Update(Me… End Sub --------------------------------------… Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click Me.Close() End Sub --------------------------------------… Private Sub SaveToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Me.Fire_AttendanceTableAdapter.Update(Me… End Sub --------------------------------------… Private Sub Fire_AttendanceBindingNavigatorSaveItem_… sender As System.Object, ByVal e As System.EventArgs) Handles Fire_AttendanceBindingNavigatorSaveItem.… Me.Validate() Me.Fire_AttendanceTableAdapter.Update(Me… Me.Fire_AttendanceBindingSource.EndEdit(… End Sub --------------------------------------… End Class ______________________________________… NOTE: I originally wanted to edit the database using an entry form in VB, but when that failed, I attempted to find the problem by trying to edit the table directly in the datagridview which led me to this current problem.

• Answer:

  Assuming the code is the same between the example and your own DB, maybe it's a permissions issue involving the user and password in the connection string. Do you get any errors or warnings at all? I'm currently working on a project in Visual Basic which connects to a MySQL database. I found it easier (maybe that's just me) to form my own queries and execute them manually. Then the datagridview updates and my changes are saved.