Datagridview And The Cell Gets Validated In The Validating Event

Aug 8, 2010

I have a datagridview and the cell gets validated in the validating event;

[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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VS 2010 : Events Validating And Validated Not Firing?

Apr 11, 2011

I'm trying to use the events Validating and Validated on a ToolStripTextbox.

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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Remove Event Handler For Datagrid Cell Validating

Dec 16, 2009

I am having a problem with the cellvalidating event constantly firing when the datagrid is refreshed (since the trigger that fires the event is the originally selected cell losing focus).I would like to remove the event handler for this at certain points of my code so that it does not fire but the examples I have come across on MSDN don't appear to do anything, so I guess I must be doing something wrong.[code]

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VB - Validating Text Boxes - Customer Information Is First To Be Validated As All Being Strings And Not Empty

May 19, 2011

I have a problem in that I have five text boxes pertaining to a customer/client, where there is a txtbox for each: Name; Address; City: State; Zipcode. Of course all the txtboxes are "" at initialization. I also have 2 combo boxes and a 2D array for prices which I have finally been able to understand the array logic. I have also been able to do my necessary calculations for.

My problem. The customer information is first to be validated as all being strings and not empty. The combo boxes I was able to get to tie to my 2 dimentional array and get good output and calculations for a finished product. I am just having problems with the error messages. Also I don't want summary totals unless the data is valid. In other words, the user must enter a complete address and make decisions about the two combo boxes, both of which are needed to use the price array. I will change the comboBoxes to represent dress sizes,"S" "M" "L" and "XL" and the other combobox to describe colorRedSatin or colorBlackBroadcloth with a two dollar difference in price between them. 'That would be similar enough to the problem I need to solve.

Basically I do not want any numbers to appear for price of the dress or addons to the dress unless all validation is complete. I do understand how the radio objects work for discounts and check boxes for accumulating accessories. The program should not give any totals untill the user has input all customer information and made decisions about input from combo boxes and selected calculate from menu. Right now it calculates and puts zeros in when choices are not made from the combo boxes by the user. It will include correct amounts for radio buttons and checkboxes if anything is entered. I need error messages for customer inputs and combo box inputs (if not selected from list of option in drop down for choices) (basically if nothing was put in a text box, the text box is empty. Of course the problem is the user must enter something in all 5 textboxes and not get multiple error messages in rapid succession to fix. We can't always count on our users putting in good data.. When I tried a Do While False with ORs I was getting endless looping. I could not get it to work because it will never execute because the control never passes back to the user.

I don't want to list a series of If/Thens becauser the user will see about 7 messages, where he/she only needs to be fed one at the time. I hope someone can give me some direction. I just need guidance on how to validate the text boxes and combo boxes. The code is analyzed with a "Calculate" on the menustrip. I would like for the calculation not to calculate and put outputs into the summery text boxes unless all textboxes are filled and combo boxes are valid for all the customer information and combo box choices for my two combo boxes describing what is needed for the order to calculate. There are also the radiobuttons and checkboxes, DIMs, Const, Variables, but not having problems with that part I have my indexing problems on the combo boxes worked out also, so I am not concerned about those now except for getting the error messages when I should. I hope that I have described my issues fully. I am using visual studio 8 with Windows 7

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Never Ending Loop While Setting Focus To Control On Validating Event In Cantrol Validating Event?

May 9, 2012

I am writing below code for validating compulsary field account no. in form.User's requirement is set focus back on field when error comes :

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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Datagridview Cell Value - Get The Old Value Of The Cell In Event

Jan 28, 2011

In cellEndEdit event I need current cell editedFormatedvalue ( well it is done) now my question is can we get the old value of the cell in this event or have to handle some other event for this means let I have a cell in which current value is abc and when I edit it it become def now I want to get both the values in cell end edit event ( or any else ) but finally I have to perform task on cellendedit

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Datagridview Cell Textchanged Event?

Apr 25, 2011

I was wondering if there's an easy way to make a cell textchanged event for a datagridview, like you have the textchanged event for textboxes, an event that gets triggered everytime the user press a letter/number/symbol/backspace/space, so i can check in that event if the datagridview has changes and whether i should enabled my save button to save the changes made.

Or is there a better way to check whether i need to enable my save button?

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.net - DataGridView Cell Click Event In VS 2010?

Jan 7, 2011

why the first code block below works, but the second code block does not? (Only thing I can see is the

Handles DataGridClaims
syntax
Block 1
Private Sub DataGridClaims_CellContentClick_1(ByVal sender As System.Object, ByVal e As

[code]....

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Add New Rows In Datagridview When Cell Leave Event?

Jun 2, 2011

I want to add a new rows when cell leave event occurs.It shows error like Operation can not be performed in this event handler...

here is my code,

If PatientDataGridView.CurrentCell.ColumnIndex = 2 Then
PatientDataGridView.Rows.Add()
End If

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Change The Value Of A Cell In DataGridView.CellValidating Event?

Sep 8, 2011

I handle the validation in the CellValidating event, and if the cell is invalid display an error message, then cancel the exit of edit mode. However I would also like to erase the content of the cell currently in edit mode.

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Create An On-KeyDown Event For A Datagridview Cell?

May 24, 2010

I'm using an on key down event for my datagridviewer that fires every time a key is pressed while the datagridviewer is selected(Focused).I want the same thing to happen while in a cell, but there is no event for key down in a cell.

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DataGridView - ReadOnly Cell KeyDown Event?

Nov 25, 2011

i have a datagridview with a readonly cell, i would like to show a formdialog window when the user press the space key. but is not possible since the cell is readonly=true.

i'v been using the following code with the EditingControlShowing event. and when the cell is readonly=false it works sometimes.

Private Sub sub_fecha_keydown(ByVal sender As Object, ByVal e As KeyEventArgs)
If e.KeyCode = Keys.Space Then
Dim frm As New frmFecha

[Code].....

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DataGridView Cell Click Event In VS 2010?

Jul 28, 2011

I am a tad new to the DataGrid controls, but I am just curious as to why the first code block below works, but the second code block does not? (Only thing I can see is the
Handles DataGridClaims syntax

Block 1
Private Sub DataGridClaims_CellContentClick_1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridClaims.CellContentClick

[code].....

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VS 2008 Datagridview Cell Value Changed Event?

Aug 2, 2011

vb.net
Private Sub DataGridView1_CellValueChanged _
(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _
Handles DataGridView1.CellValueChanged

[code]....

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C# - After Which Event Should Perform An Action After Editing A Cell In A DataGridView

Mar 24, 2010

I have a WinForms DataGridView control on a form. There are two fields in this DataGridControl:

Email Address
Resolved Email Address (calculated based on the input in Email Address)

After the user inputs or changes a value in Email Address, I want the value in Resolved Email Address to update based on a separate method. What event should I tie in to so that that the Resolved Email Address cell is updated after the Email Address cell is updated?I'm not sure where to put the event because the user could do a number of things after adding/changing a value: tab to the next cell, click cancel on the form, click ok on the form, etc.

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Comboboxcolumn In DataGridView With An Event That Autosizes Cell Width

Nov 25, 2009

I have a comboboxcolumn in a DataGridView. I have loaded int with string data that appears in the dropdown box. I have added an event to it for an SelectedIndexChanged. What I am trying to do is autosize the width of the cell in the column based on the string chosen in the drop-down box within this SelectedIndexChanged event. This seems to work but it does not work off the initial selection change. When I select the desired string in the dropdown box the width of the cell does not autosize. I am not sure why.

I was trying to get around this by wrapping an IF stmt around the autosize logic by saying if cell value = "" then cell.width = Max Width of all loaded strings/ However, I can't figure out how to access the string array loaded into the dropdown list

[Code]....

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DataGridView - Trigger Event When Type Something Wrong In Cell

Jun 1, 2011

I want to have one event triggered when I type something wrong in the cell in the specific column in the datagridview. What event should be? Or cell leave?

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Change Cell Color Of A Datagridview On The Form Load Event?

Nov 10, 2010

I would like to be able to show the defaultstyle of the cell in the form load

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Pass Cell Location Of DataGridView To An Event Handler Via A ContextMenu?

Nov 20, 2009

I have a context menu which is shown over a DataGridView as follows below. The Context menu is shown if the mouse up occurs over the second column of the DataGridView. I also have a bunch of event handlers set up for each item in the context menu. I now want to pass the location of the cell in the datagridview to the event handlers.Do I have to pass the NewPoint() to a public variable and then translate that into a cell location within the event handler?

Private Sub DataGridView14_MouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) Handles DataGridView14.MouseUp
Dim hitTestInfo As DataGridView.HitTestInfo

[code].....

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Raise EditingcontrolShowing Event When We Try To Change The Value Of A Combobox Cell In Datagridview

Jul 21, 2011

is it possible to raise EditingcontrolShowing event when we try to change the value of a combobox cell in datagridview

[Code]...

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VS 2010 DataGridView - Event When User Edits Checkbox Cell?

Jun 6, 2010

I'm afraid this is a very simple question, but I can't figure it out... I hardly ever use the DataGridView (usually use a third party grid) so I never needed to do this before.Anyway, I have a DataGridView that is data-bound to a List(Of SomeClass). The grid is not ReadOnly, but I made every column ReadOnly except the very first, which is a boolean column so it displays a checkbox. This way, the user cannot edit any cell value, but he can check/uncheck the checkbox in the first column.

What I need now basically is an event that is raised when the user (not programmatically) changes the value of this checkbox. I also need to be able to retrieve the bound item from that event (from the row number I think?) but that should be no problem, I hope.Anyway, there's a bunch of events that looked promising but all have something I don't want:

1. CellBeginEdit - Fires before the checkbox value has changed, so can't use this.

2. CellEndEdit - Only fires after the edited row loses focus. I want to save it back to the database as soon as the user changes the checkbox value!

3. CellValueChanged - Same problem as nr 2.

I'm sure it must be possible for me to react as soon as the user changes the value of the checkbox? How can I do this?

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Populate A Single DataGridView Cell with Input Of A Textbox After Click Event Of A Button?

Jan 10, 2011

How can I populate a single DataGridView cell with input of a textbox after click event of a button?

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Validating Textbox - Which Event To Use

Feb 19, 2012

I have a textbox control to take some input and a button to execute something. I want the button's click event will not work as long the validation to the textbox is successful.

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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Validating Event Getting Triggered Twice In Maskedtextbox?

Aug 17, 2010

I am facing a issue while using the "validating" event of the maskedtextbox. I have an MDI form, in which there is a main form and a form acting as bottom bar. The bottom bar comprises of buttons for moving to "previous" and "next" forms. If suppose in the main form i have a maskedtextbox and the initial focus is set on it, then on the click event of the button (next; which is on the bottom bar form), it calls the validating event of the maskedtextbox twice. In the validating event of the maskedtextbox, i am checking some validations and if it doesnt pass, then i set [e.cancel = true]. just let me know the reason behind the triggering of "Validating" event twice?

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Bypass Validating Event For Exit Button?

Jan 31, 2009

I have a validating event for a txtbox called txtname. If the user tries to leave txtname for another txt box without entering their name a messagebox comes up giving an error. I have an exit button which will when clicked ask you if you really want to leave then you can choose yes or no. I can't seem to figure out how to allow the user to click the exit button while leaving the txtname blank so it would bypass the error message and only bring up the exit prompt. Here's what I have coded for the validating event and the exit event.

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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C# - Equivalent Of WinForms TextBox.Validating Event In WPF

Sep 11, 2009

In WinForms I could handle the Validated event to do something after the user changed text in a TextBox. Unlike TextChanged, Validated didn't fire for every character change; it only fired when the user was done.Is there anything in WPF I can use to get the same result, an event raised only after the user is done changing the text?

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Disable The Validating-Event When Form Close?

Dec 5, 2005

i have a form hold some textboxes ,writed validating-event code and sometime set cancel=true in validatingnow,the problem is,when i click the close button of the form,the validating-event fired,and the form can't close when the validating set cancel=true,but this not i want.i think click "close" that meaning abandon all the form's data,so it not need validate.how can i do ?

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Suppress The Validating Event When The Form Closes?

Jul 1, 2009

We have a window that has a text box on it that the user must enter in valid data before going on. So we have put in a message box letting the user know that they have to enter in the correct data before going on in the Leave event. That works just fine, but when the user press ALT+F4, or presses the X in the upper right corner of the window it still goes through the event. We would not like for that to happen. When we were using VB6 the same code was in the lost focus, and when the user pressed ALT+F4, and the X the LostFocus event did not fire, or acted like it did not fire. We have also tried moving the code to the Validating event, but it behaives similar to the Leave event? how to close a window, and either have the Leave, LostFocus, and Validating events not fire when the user Presses ALT+F4, or the X

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Validating Event For Multipel Text Boxes?

Jan 13, 2010

I have an application that has more than 20 text boxes used as inputs(numeric) ( in a form with multiple tabs), and from these numeric inputs I calculate many parameters and display them in other text boxes.The question is how can I trigger an event that will run the calculation procedures each time any of the text boxes numeric values change?( with out having to make procedure for each text box validated eventIs there some thing like a common validation event for any entry in any text box?

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