Sql - Validate Datagridview Using The Cellvalidating Event

Jun 5, 2009

I have a datagridview that I would like to validate using the cellvalidating event. however as the user doesnt navigate between cells or rows in the datagridview. just enters data in a cell in the datagridview and then clicks a save button the cellvalidating event doesnt get fired.


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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Validate Email Address On An Event In .net?

Jun 12, 2011

validate e-mail address on an event in vb.net?

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Validate Text Box On A Button Click Event?

Mar 27, 2009

Is there a nice simple way I can validate that text box using an If statement to make sure it follows the rule [#][#]:[#][#] (The #'s are single numbers) and not allow anything but a ':' to separate the pairs?

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.net - Why RowLeave Fires Before CellLeave/CellValidating

Mar 19, 2009

I have an update statement under RowLeave event of my datagridview. Before I update it I need to validate the cell if there is an empty value. But whenever I moved the focus to another row, RowLeave is called first before CellLeave/CellValidating.Is there another way of validating the cell when leaving a row?

Note: Leaving a cell in the same row is not a problem.

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Possible To Use Exclamation System Event To Validate Data Capture?

Aug 23, 2010

In a Windows XP Pro environment, my system uses a mainframe emulator in a window in which a scanning application is running. The data populating the mainframe app comes from various instruments, scales, barcode scanners, etc.. The data inputs are captured by a winwedge type RS232 data aquisition software.

When all the data is processed correctly, the mainframe application sends an "operation completed" message and creates an exclamation system event associated with a specific sound to inform the user.

My goal is to create a MS Access application that would use the Exclamation system event  to validate writing the barcode that was just read to a database without further querying the mainframe, creating a local database. I only want to write the barcode when the mainframe application completed and therefore played the sound.

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VS 2008 CellValidating - Cannot Convert A DBNULL Value To STRING

Nov 2, 2009

I am having a problem with the DIM statement. It is saying that it can not convert a DBNULL value to STRING even though there is something in the cell.


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How To Validate A Cell Of Datagridview

Oct 15, 2011

I have a datagridview on my form.There is a column of roll no in the datagridview. I want that whenever user presses anyother key than a number key(ex:1,2,3,4....)than immediately i should get a messagebox that only numbers allowed. I have tried the below code on datagridView Cellvalidation event but its not working. how can i do such validation.

If GridView2.Item(2, GridView2.CurrentCell.RowIndex).Selected = True Then
If e.ColumnIndex = 3 Then
If Not IsNumeric(e.FormattedValue) Then


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Validate Selected Column In Datagridview?

Mar 6, 2010

I'm trying to validate that a particular column in a datagridview has been selected.

I've created this code which transfers the value of the selected Customer ID cell in the datagridview to another form.

Private Sub mnuFileEdit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFileEdit.Click
'Define variable for the current selected cell value


It's working fine but at the moment any column in the datagridview can be selected and transferred which causes an error.

So I want to create an If Then statement which confirms that the selected column with the dgv is the PK_ID (customer ID) column before processing the rest of the code. I've tried playing around with "If dgvCustomerSearch.SelectedColumns("PK_ID") Then" but a "Value of type...cannot be converted to Integer" error occurs.

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Validate Html.editorfor - Validate The User Data Entered

Apr 26, 2012

I'm trying to figure out a way to validate the user data entered:


This is in MVC3, VB.net. I'm looking for an easy way to validate a users input data into the editorfor field.

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Asp.net - Validate User Role During Login Button Click Event In Login Control?

Apr 9, 2011

I have a login control in my asp.net webform i uses the roles manager...i have two roles admin and vendors i want when user enter username and password in login control then on login button click event it validates either the user is admin or vendors if vendor is admin then it will redirect to default.aspx other wise stay on login page with error. ...how to do this using vb.net ?

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Validate Event From Executing When "X" Close Form Is Clicked

Apr 21, 2011

I have some code in a textbox.Validating event I don't want to execute when the user clicks on the form "X" button to close the form.

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.net - DataGridView & ComboBox Event?

Nov 16, 2009

Using VB.Net, I have a DataGridView with a ComboBox Column. What even do I use for when the user changes a selection in the ComboBox?

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DataGridView :: Which Event To Use In Selecting A Row

Feb 14, 2010

I have a bound datagridview containing 4 columns. All I want to do is click on a row and then assign the value for each column to other controls (in this case textboxes). My problem is, I'm not sure which Event to use. I don't know how many events I've tried the code below in several different events but none of them are working.[code]

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Datagridview DefaultValuesNeeded Event

Mar 1, 2007

I can't seem to find the exact answer I am looking for. I have a datagridview control on a form bound to a binding source. I want to use a binding navigator to control the additions and deletions of rows. I also need to prompt several default values when a new row is created.

I can accomplish this task if I allow the user to add new rows. When the row is added, my default values are loaded through the DefaultValuesNeeded event. However, the click event on the Add Item in the binding navigator does not call this event. How can I force this event to be raised when clicking on the binding navigator add item button?

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DataGridview Doubleclick Event?

Sep 13, 2011

How do I set the all data in the datagridview goes into the textbox?For Example Fields name.LastName the data will be shown into lastname.text , FirstName will be shown into the firstname.text and also the other fields into the sql database.And how also to can not type into the datagridview or will be disable to type in every cells.

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Datagridview.Selectionchanged Event

Oct 28, 2009

i got another problem with this selectionchanged event in datagridview1, i set my datagridview1 to Selectionmode = fullrowselect.

the problem is i got nullreferenceexception error whenever i clicked the column header, so meaning selectionchanged fire when i click the columnheader since columnheader will have a row value of null the exception appears, i tried to catch it but ending up in messy situation which the code i written doesn't run right. is there anyway to prevent user from clicking column header but it still visible? but if i do that user cant sort the data right. [Code]

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DefaultValuesNeeded Event Of The DataGridView?

Jul 26, 2010

I have found a problem with the DefaultValuesNeeded event of the DataGridView Setup a form with single DataGridView and add 2 columns using default names. Go into form design and in the Form header write a Dim I as interger line Create a DefaultValuesNeeded event for the grid and enter the following code.


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Is There Any Event In Datagridview Like Dgv_TextChanged

Oct 5, 2011

Is there any event in datagridview like Dgv_TextChanged. Like When we double click on a textbox it create a Textbox1_TextChanged event. Actually i want that, when i start writing numeric value in datagridview cell, it start calculating in another cell, as we write in textbox it start acting/calculating with the each inserting value in another textbox.

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Capture Event When Value In Datagridview Is Changed?

Apr 2, 2010

I've been searching all over and I'm either not searching for the right words or it just doesn't exist. I've got a datagridview (dgv) on a form with some textboxes that are databound to different fields in the dgv's datasource. I want to capture an event if someone changes a value through one of the databound controls so I can mark the row as modified. I've been going through the dgv events trying to capture something, but I can't find anything that fires when a value is changed. The dgv is read only, so the values can only be changed through the databount textboxes.

How to I know if someone changes a value in the dgv? Is there a setting in the dgv that will tell me if a row is modified?

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Colorize Datagridview In Event Cellformating

May 22, 2010

I am trying to colorize my datagridview in event cellformating (as written on msdn [URL])but it works so slowly. I have seeing before more difficult possibility to set color for cells thrue Class, but currently I forgot where it was and can't find. Or may be my datagridview is slow self. Is it exist a possibiity to make this element faster on VB.net?

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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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Datagridview Checkbox Click Event?

Mar 9, 2011

my Question is that if i ./ tick the Checkbox in datagridview the datagridview Column (4) value show in textbox if user click multiple tick in datagridview , the datagridview column(4) value  add in textbox

For a = 0 To DataGridView1.Rows.Count - 1
If DataGridView1.Rows(a).Cells("checkbox").Value = True Then
TextBox8.Text += DataGridView1.Rows(a).Cells(4).Value
End If

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DataGridView: Catch Event When It's Row Became The Current Row?

May 11, 2009

I just want to know if there any equivalent event (ADO. NET VS 2008) event as in MS ACCESS Form's OnCurrent Event.The reason is I like to make some calculations based on some data bound controls with current datarow data when user clicked a row in DataGridView (or by using bindingNavigator). I've tried with DatagridView's RowEnter event. But some Data bound controls are not yet reflect the data of current datarow when that evet was fired.

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DefaultValuesNeeded Event Not Firing In Datagridview

Apr 9, 2010

Private Sub dgvEquipTran_DefaultValuesNeeded(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewRowEventArgs)   Handles dgvEquipTran.DefaultValuesNeeded
e.Row.Cells("ID").Value = Me.cbxID.Text
e.Row.Cells("Rate").Value = 12
End Sub

I've got the above event setup. However after select and delete the last row of a one row datagridview, the above event doesn't fire. Even when the current selected row is the new row (one with *). I have to click away, on the next tab and back again before it is fired and populated the new row with the values.

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Handle A DataError Event With Datagridview?

May 13, 2009

I have been reading up on this, but I can't get it to work for me. I am reading in comma delimited text into a three-column datagridview control. The third column is a combo box which only accepts certian values. If the data being imported into col 3 is not in the combo box list I get an error that tells me to handle the data error event.trying to capture that error and get rid of the default error message box. I am working with a Try/Catch statement, but it doesn't seem do anything.

Do Until fileReader.EndOfStream
stringLine = fileReader.ReadLine()
If Not stringLine.StartsWith("'") And Trim(stringLine) <> "" Then


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How To Handle A DataError Event With Datagridview

May 18, 2009

I cannot Unresolve a post.I have a datagridview control with a combo box. The user loads data from a file into the control. If there are errors (the element in the combo box column is not in the combo box list) I would like to:

1. capture the row in which the error occurred, and store it in code/memory
2. change the cell backround to red (this is not that important)
3. continue without a message at the time of the error
4. post a message with all of the errors after the load is complete

I am using the code staight out of the Microsoft example to try to figure how to do this, but it is not posting any messages when I load bad data, so I am not getting any smarter from the example.[code]

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New Table In Datagridview On Click Event?

Oct 11, 2010

how to load a new table into a datagridview on a click event. What I have is one datagridview and three buttons. I have a sales button, an inventory button, and an add inventory button. What I want to do is be able to click a button and have it load the corresponding table into the datagridview.

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VS 2008 Which Is The Best Datagridview Event To Perform

Dec 9, 2009

I have a datagridview comboboxcolumn populated with jobs. these jobs have a wage attached to them. for example job "Policeman" has a wage of R20.I have 5 checkboxcolumns for each day of the week as well. so if I check 3 of the checkboxes and have the job "Policeman" selected, I must then calculate the weekly wage (3*20=60) and display the wage in the weekly wage column. which event is best to handle this.

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What Fired An EndEdit Event In A DataGridView

Mar 8, 2010

I have a datagridview that completely updates anytime changes are made to it. It is not connected to a source but rather the datagrid is filled when first launched.

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


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.net - Datagridview Cellcontentclick Event Not Getting Time To Complete

Apr 11, 2012

i have a datagridview i have an edit button associated with each row. on CellContentClick event i am dynamically deleting and creating number of textbox and label controls in my tablelayoutpanel this dynamic deletion and creation of control is taking some time also flickering (well thats not a big issuse)but the problem is if someone continuously keep clicking on edit buttons of various rows after some time the whole tablelayoutpanel is a complete mess.

accordng to me this is happening coz my CellContentClick event is not geting time to complete and before the event get complete one click the edit button of some other row . and i am unable to handle this situation

am adding some more details -

the handler code is here

Private Sub gdXMLDOc1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles gdXMLDOc1.CellContentClick
If lockThis = False Then


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.net 2008 DatagridView - Changing What Triggers An Add Row Event?

Nov 3, 2009

I have a datagridview which is populated from the SelectionChangeCommitted event of the combobox. The datagridview contains both bound and unbound data columns (see below).

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Add And Remove Datagridview With Button Click Event

Feb 27, 2012

I want to add and remove Datagridview in VB.NET with button click event. Can it be possible.

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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
End If

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Capture Decimal Value In Datagridview Keypress Event

Jan 18, 2011

i am using the following logic to capture the keypress event in a dataGridView so that I can edit numeric cells but cannot capture decimal value in my code i cannot pass the digit.


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CheckBox Event Of DataGridView - Transaction On Click?

Mar 3, 2011

I have field NAME nvarchar(5),Checkval bit in sqlsever. I want to bind already to Datagriview in vb2005. When I check filed checkval. It will to do something that I need. I don't want to use event cellmouseclick or cellvaluechanged because it didn't react when we click. Which event that do transaction when we click check.

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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 - How To Intercept Button Click Event

Nov 19, 2010

I am learning Visual Basic 2008. I have created a form with a datagridview bound to a dataset. I also added a button to the datagridview. When the button is clicked I want to be able to update a couple fields in the grid with new values. How do I intercept the click of that button?

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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


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