title: Check if any control has changed and save data upon form closing
body: <p>We are using vb.net / dev express tools.  We have several controls textboxes, combos etc... instead of checking each value changed we want to go through all controls and check if anything has been edited, then save upon form closing. Below is some code i have tried to accomplish this.  Problem is, although it technically works... it uses recursion AddDirtyEvent(c) , so when i go to close the form and click yes to save.. it calls that messagebox multiple times due to multiple controls... if i take that out , it won't work and detect the dirty change.  I'm just wondering how can i get this to work the way i want or if there is an easier way... </p>
  
  <pre><code> Dim is_Dirty As Boolean = False
  
    Private Sub AddDirtyEvent(ByVal ctrl As Control)
  
      For Each c As Control In ctrl.Controls
          If TypeOf c Is TextEdit Then
              Dim tb As TextEdit = CType(c, TextEdit)
              AddHandler tb.EditValueChanged, AddressOf SetIsDirty
  
          End If
          'If TypeOf c Is ComboBoxEdit Then
          '    Dim cb As ComboBoxEdit = CType(c, ComboBoxEdit)
          '    AddHandler cb.SelectedIndexChanged, AddressOf SetIsDirty
  
          'End If
          If c.Controls.Count &gt; 0 Then
              AddDirtyEvent(c)
          End If
  
      Next
  
  End Sub
  
  Private Sub SetIsDirty(ByVal sender As System.Object, ByVal e As System.EventArgs)
      is_Dirty = True
  End Sub
  
  Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
  
      If is_Dirty = True Then
          Dim dr As DialogResult = MessageBox.Show("Do you want save changes before leaving?", "Closing Well Info", MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2)
          If dr = Windows.Forms.DialogResult.Yes Then
              SimpleButtonSave.PerformClick()
              Me.Close()
          End If
      End If
  End Sub
  </code></pre>