Prevent Firing RowValidate/Validating Event Before A Function?

Apr 4, 2012

I designed a DataGridView under the name "dgvTarifa" and took a chance on trying Row Validating (tried Validated, CellEnter, CellLeave, RowEnter, RowLeave all count same) event. The purpose of the code is to load the selected values of the respective columns into three textboxes in order to rephrase/revalue those and update them by pressing a button. All works fine every single line of code there's nothing wrong except one logical thing.

When the form loads the RowValidating automatically fires because I have a function that Selects the table from the Database and it fills the DataSet by then attaching it to the datasourse of the "dgvTarifa" table. After setting the datasource of the datagridview, it automatically jumps to the RowValidating event which I DONT WANT TO! It first has to finish the whole function and later when the user enters with mouse or enters/leaves a row this has to be fired. (eventually already have the CellClick event with the same code below so only RowValidating has to work properly...)

Here's the code I use at row validating

Code:
Private Sub dgvTarifa_RowValidating(sender As System.Object, e As System.Windows.Forms.DataGridViewCellCancelEventArgs) Handles dgvTarifa.RowValidating

[Code].....

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Prevent Validating/Validated Event From Firing In Custom Textbox?

Oct 28, 2009

I have a custom text box component (inherits from system.windows.forms.textbox) that I created in vb.net (2005) that handles the input of numeric data. It works well.

I would like to suppress the validating and validated events from firing if the number hasn't changed. If a user is tabbing through the form and tabs from the text box, the validating/validated events are fired.

I was thinking that the text box could cache the value and compare it to what is listed in the text property. If they are different, then I would want the validating/validate events to fire. If they are the same, nothing is fired.

I can't seem to figure out how to suppress the event. I have tried overriding the OnValidating event. That didn't work.

Update:

Here is the custom text box class. The idea is that I want to cache the value of the text box on the validate event. Once the value is cached, the next time the user tabs through the box, the validating event will check to see if the _Cache is different from the .Text. If so that is when I would like to raise the validating event to the parent form (as well as the validated event). If the _cache is the same, then I don't want to raise the event to the form. Essentially the text box will work the same as a regular text box except that the validating and validated method are only raised to the form when the text has changed.

Public Class CustomTextBox
#Region "Class Level Variables"
Private _FirstClickCompleted As Boolean = False 'used to indicate that all of the text should be highlighted when the user box is clicked - only when the control has had focus shifted to it

[Code]....

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Apr 1, 2009

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aircode below:

Code:

Private Sub OnNewCall(ByVal sender As Object, ByVal e As NewCallEventArgs) Handles tapiManager.NewCall
if newcall.callerid = "5551001" then
redirect(newcall)

[code]....

If callA.callerid = "5551001" then redirect(callA)but, once it is redirected to the new extension, do not then grab the call from the new extension and try to redirect again (resulting in infinite loop).I realize I could use an integer as a counter, but the problem is, I might actually get more than 1 call at the same time from the same callerid number. And, all the calls would need to be redirected (once).the calls do have properties like (which are unique identifiers to each call):

Code:

phcall.id and phcall.hashcode

I'm thinking I need to put that unique id into a temp var / array to run a check against to see if it has been redirected, if it has then skip, if it has not then redirect.The app would run 24x7, and I don't want the temp var / array to get too big, and would want to have it clean automatically (up on a timer maybe?)(I'm guessing it would be a dynamically growing array.)

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<asp:Button ID="btnsubmit" runat="server"
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btnsubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
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If txtAccountNo = "" Then
MessageBox.Show("Account no filed can't be left empty")
txtAccountNo.SetFocus
Exit Sub
End If

It's working properly. But suppose user don't want to fill form and exiting from application.Message box keep on appearing till user enters account no.

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Jul 27, 2010

I have a MDIParent form and 2 child forms. One of them,form1, has a textbox for which certain validations are present in the validating event. The other one has a button on it. When I try to navigate from form1 to form2, the validating event is firing twice for the first time. Is there a way to make it fire only once. And also, this event fires whenever I try to close the mdi parent form Attached is a sample project.

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Apr 11, 2011

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Private Sub txtMenuOwnIP_Validated(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtMenuOwnIP.Validated
MyIP = txtMenuOwnIP.Text
StatusLabelIP.Text = MyIP
End Sub

[code].....

Neither code is firing.The CausesValidatition of the txtMenuOwnIP is set to true.I can enter stuff into that Textbox and leave it using the Mouse or simply piush Enter, but the posted code won't get fired (used a Breakpoint in both subs). There are no other event routines for this command used.

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Feb 22, 2012

prevent a button serverClick event from firing on page refresh?

Markup:

<INPUT id="btnGo" type="button" value="Go" runat="server">

VB.net:

Public Sub btnGo_ServerClick(ByVal sender As Object, _
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The btnGo_ServerClick function needs to fire on the button click, but not on page refresh.I've tried using IsPostback, but that is always true- even on the button click.N.B. I'd rather not go into the reasons behind why I'm using a serverclick, rather than an asp:button and a click event. Suffice to say it just isn't suitable for I am doing.

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Consider a simple VB.NET form with a couple of radio buttons and a checkbox.

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I currently get around this by not initializing the radio button, but I need to set that default eventually and the best place is from the designer. I also can add a boolean field that's not set to true until the form is fully loaded and not process the events if that is false, but it's a dirty hack.

What can I do to prevent that handler from running its code?

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[Code]...

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Private Sub txtSuffix_validate(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtSuffix.Validating
If Not txtSuffix.Text = "" Then

[Code].....

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Private Sub createBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles createBtn.Click
Try
If addUsername.Text = "" Or addPassword.Text = "" Or addRole.Text = "" Or addName.Text = "" Or addAddress.Text = "" Then
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[code]....

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Private Sub txtName_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtName.Validating
If IsNumeric(txtName.Text) Then

[Code].....

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[Code]...

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Jul 1, 2009

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[Code]....

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[Code]...

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Visual studio 2005

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[code]...

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[code].....

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[code]...

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