![]() ![]() Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.LoadĪddHandler TextBox1.TextChanged, AddressOf AllCompleteĪddHandler TextBox2.TextChanged, AddressOf AllCompleteītnInsert.Enabled = False End Sub Private Sub TextBox1_Validating(sender As Object, e As ) Handles TextBox1.Validating MessageBox.Show(strErrorList, " List Of Errors") OrElse txtrack_no.Text = String.Empty OrElse TxtNo_of_Books.Text = String.Empty OrElse txtvol_no.Text = String.Empty OrElse DateTimePicker1.Text = " ")ītndelete.Enabled = Not (cboISBN.Text = String.Empty) Not (txtbook_name.Text = String.Empty OrElse txtauthor.Text = String.Empty OrElse txtprice.Text = String.Empty _ StrErrorList += ErrorProvider1.GetError(ctrl) & ChrW( 10) &Įnd If Next If Len(strErrorList) = 0 Then ' Process stuff if no errorsītnsave.Enabled = Not ( Of TextBox).Any( Function(t) t.Text = String.Empty) And Not (cboStaff_id.Text = String.Empty OrElse cboPub_id.Text = String.Empty OrElse cboSub_Code.Text = String.Empty _ītnSaveUpdate.Enabled = Not ( Of ComboBox).Any( Function(cbo) cbo.Text = String.Empty) And _ If Len(ErrorProvider1.GetError(ctrl)) > 0 Then StrErrorList = " " For Each ctrl In Me.Controls ' Also adding below handlers for textboxes to check for value change AddHandler txtbook_name.TextChanged, AddressOf ValidateInputsĪddHandler txtauthor.TextChanged, AddressOf ValidateInputsĪddHandler txtprice.TextChanged, AddressOf ValidateInputsĪddHandler txtrack_no.TextChanged, AddressOf ValidateInputsĪddHandler TxtNo_of_Books.TextChanged, AddressOf ValidateInputsĪddHandler txtvol_no.TextChanged, AddressOf ValidateInputsĮnd Sub Private Sub ValidateInputs( ByVal Sender As Object, ByVal e As EventArgs) ' creating a FOR EACH LOOP to check all comboboxes for value presence For Each cbo As ComboBox In ( Of ComboBox)()ĪddHandler cbo.TextChanged, AddressOf ValidateInputs ![]() ' Also adding below handlers for comboxs to check for value change AddHandler cboStaff_id.TextChanged, AddressOf ValidateInputsĪddHandler cboPub_id.TextChanged, AddressOf ValidateInputsĪddHandler cboSub_Code.TextChanged, AddressOf ValidateInputsĪddHandler DateTimePicker1.TextChanged, AddressOf ValidateInputsĮnd Sub Private Sub btnUpdate_Click(sender As Object, e As EventArgs) Handles btnUpdate.Click ![]() ' creating a FOR EACH LOOP to check all textboxes for value presence For Each t As TextBox In ( Of TextBox)()ĪddHandler t.TextChanged, AddressOf ValidateInputs Private Sub txtZip_Validated(ByVal sender As Object, ByVal _Į As System.EventArgs) Handles txtZip.Private Sub btnInsert_Click(sender As Object, e As EventArgs) Handles btnInsert.Click ' Give the ErrorProvider the error message to ' display.ĮrrorProvider1.SetError(txtZip, "Invalid ZIP code " & _ ' Cancel the event moving off of the control. Private Sub txtZip_Validating(ByVal sender As Object, ByVal _Į As ) Handles _ When you move to the third TextBox, the Validating event fires and the fun begins. If you move to the second TextBox, nothing happens because it has CausesValidation = False. The second has its CausesValidation property set to False while the third has CausesValidation = True.Įnter a value in the first TextBox. The first has the following event handlers thuat veify that it contains five digits. Use the ErrorProvider's SetError method to clear any previous error for that control. The Validated event handler executes when a control is successfully validated. Then use an ErrorProvider control's SetError method to flag the control's value as invalid. Optionally select theh offending text (for example, in a TextBox). If it does not, set the event handler's e.Cancel value to True to cancel the event that is trying to move out of the control. Use the Validating event to see if a control contains a valid value. Validate, validation, Validating, Validated VB Helper: HowTo: Use validation events in VB. ![]()
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