DataGridViewComboBoxCell Tag Cleared In EditingControlShowing Event?
Aug 23, 2009DataGridViewComboBoxCell Tag cleared in EditingControlShowing event?
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Raise EditingcontrolShowing Event When We Try To Change The Value Of A Combobox Cell In Datagridview
Jul 21, 2011is it possible to raise EditingcontrolShowing event when we try to change the value of a combobox cell in datagridview
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DataGridViewComboBoxCell SelectedIndexChanged Event?
Jul 31, 2008On a form I have a DataGridView. Inside this DataGridView i have several columns of which one is combobox and the others are textboxes.The combobox column is populated with values from a MySql database table using a query. So far so good. What i want next is to populate a certain textbox from that DataGridView, automatically after a value from the combobox is selected. When a value is selected from the dropdown list of the combobox, that value is used in a SQL query to find the value that will be displayed in the textbox.All the textboxes and the combobox are inside the DataGridView!)I did this using DataGridView EditingControlShowing event because a DataGridViewComboBoxCell does not have aSelectedIndexChanged event.The value is displayed correctly in the textbox, but the problem is that the value selected from the combobox disappears after the selection, and the combobox remains empty. I need the value to remain in the combobox after it was selected and after the corresponding value was inserted in the textbox!Here is the code for this:
Code:
Private Sub test_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Populating the combobox
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Handling Datagridviewcomboboxcell Event?
Jun 15, 2009I have come accross many scenarios of handling datagridviewcombobox events, however none seem to fit my scenario, or I may be missing something.1. I need to capture the column index that the combobox is resident in. This is because I have a complete row of comboboxes that should set the header text to the selected value.here is the code I have so far:' I also use a list of string as datasource publicly declared
Public cs As New List(Of String)
'to insert the combo's into the grid
Dim row As New DataGridViewRow
cs.add("Book")
cd.Add("Author")
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Datagridviewcomboboxcell No DropdownClosed Event Other Data Cannot Be Displayed Immediately
Dec 9, 2009I use VS2005 and visual basic. I have a SaleDetail table has the following fields:
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Display ValueMember Of DataGridViewComboBoxCell On Combobox Changing Event?
Mar 19, 2012I'm using this code:
Dim cListItems As New System.Collections.Generic.List(Of Combobox_values)
cListItems.Add(New Combobox_values("One", "1"))
cListItems.Add(New Combobox_values("Two", "2"))
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"Cleared" Event Gets Added To The Listview?
Nov 11, 2011I've made a SCADA system with VB.net and AdvancedHMI, which is a program that monitors plant equipment etc.I've also made an alarm logger which out of a listview, so, when an alarm comes in, say "Alarm 1", en entry gets added to the list view as an "Active" event.
If the alarm clears, then another "Cleared" event gets added to the listview.This works OK, but when you start to get lots of alarms, it's difficult to determine which alarms are actually active, because you may have multiples of the same alarm.What I want to do, is to be able to press a button, which looks for when there has been an "Alarm" event and then a "Cleared" event for the same alarm, and then removes both of them from the listview. So it should then show only active alarms.I know that maybe a listview possibly isn't the best choice for my ultimate goal,
EditingControlShowing Events Firing Multiple Times?
Feb 24, 2009I have a DGV in VB.Net 2008 connected to an Access DB table. The DGV is not Read Only, but is full of read-only columns except for one, which contains a combo box. The combo box allows the user to select an outcome for that particular row, and then the program copies in a pre calculated value into the "Profit" column depending upon the item selected in the combobox. Then the user hits the Save button and the DB updates (currently via SQL methods in the XSD).
Easy enough so far.
Here is the code.
Private Sub DGUserBets_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DGUserBets.EditingControlShowing
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The problem I have is that it would seem that if a user selects the desired outcome from the combobox but does NOT hit Enter, and simply mouses on to a different combobox to again select the outcome for a different row, the first eventhandler is not disconnected and thus the events fire multiple times. This then causes various default MsgBox errors and brings up problems when the user tries to commit all changes to the DB/exit program etc etc.
What do I need to do? Do I need to .EndEdit somewhere appropriate to force the row to save the changes? And where should I call this?
DataGridViewComboBoxCell Value Is Not Valid
Aug 12, 2010Using VS2010 and VS2008
I have a DataGridView bound to a DataTable which has an Int16 DataColumn. The DGV has a DataGridViewComboBoxColumn tied to the DataColumn.
I enter integer values in the Items section of the DGVCBColumn properties. When I run the program I get "DataGridViewComboBoxCell value is not valid".
I assume this is because my Items are text and the data column is integer so I created a List of Integer, added my integer values/choices to the list and made the List my data source for the ComboBox column. Same error.
I then created another DT in the DS with one column type Int16, added my integer choices to the DT, created a BS for the ChoicesDT and set this BS as the DataSource, the column as the DisplayMember and the ValueMember. Same error.
There are no issues like this when the DataColumn is bound to a ComboBox outside of the DGV so I assume there is some issue with the DGV understanding the underlying binding.
Set Datasource For DataGridViewComboBoxCell?
Aug 20, 2009I have a datagridview and a column which is DataGridViewComboBoxCell
I want to set datasource for that DataGridViewComboBoxCell?
Message Box Pop Up Not Cleared Properly
Aug 2, 2011I have an application in VB.net. I am using the msgbox inside the execution of a loop. Now the message box pops up fine, but when i click on "Ok" in the pop up, the message box
View 1 RepliesDatagridview - Get The SelectedItem Of DataGridViewComboBoxCell .NET?
Mar 17, 2012The problem I have now is that I can not get the value selected as a combobox, I'm trying to set the text and value to each item in the combobox of each cell in the datagrid.
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Looking For A Workaround For Using DatagridViewComboBoxCell Dynamically?
Nov 20, 2009[URL]..But I can't design a solution. Could anyone try to help me out here? I know there are some workarounds to be found, but either the links are dead (check above link) or it's writter in a language I still can't read. Here's my code.
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NullReferenceException When DataGridViewComboBoxCell Is Clicked?
Jan 19, 2012I get the following error message when entering edit mode on a DataGridViewComboBoxCell:
System.NullReferenceException was unhandled Message=Object reference not set to an instance of an object.
Source=System.Windows.Forms
StackTrace:
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Rebind DataSource To DataGridViewComboBoxCell?
Sep 16, 2009I have a DataGridView with two DataGridViewComboBoxColumns. I want to use the selected item in the first column to trigger a re-population of the items in the second column, on a per-row basis.
Here's the code I have so far. "addlInfoParentCat" identifies the first column, and currentRow.Cells.Item(1) is the DataGridViewComboBoxCell that I want to re-populate. ExtEventAdditionalInfoType is a type I defined that contains the string/value pairs.
Private Sub dgvAdditionalInfo_CellValueChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvAdditionalInfo.CellValueChanged
Dim currentCell As DataGridViewCell
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Switch Between DataGridViewTextBoxCell And DataGridViewComboBoxCell?
Nov 18, 2009I want to have a DataGridView that has two columns.The first column will always be of type DataGridViewComboBoxColumn. Based on the selection in that column, I'd like to be able to change the corresponding cell in the second column to either a DataGridViewComboBoxCell or a DataGridViewTextBoxCell.I'm thinking I just need to make the second column of type DataGridViewColumn, but don't understand the mechanics of how to change the cell type on the fly.I'm working with VB.NET in Visual Studio 2005.
Update: One way around it, I suppose, is to make the second column as a DataGridViewComboBoxColumn, and change the attributes of the cell so that it either behaves like a drop-down list, or as an (editable) drop-down with no elements. The latter looks enough like a text box that I could live with it, and it wouldn't involve changing the type of the cell.
VS 2010 DataGridViewComboBoxCell Tag Property?
Apr 24, 2011I'm getting some data from a database and I'm setting them to a DataGridViewComboBoxCell. I also need to set the Tag property of each DataGridView ComboBoxCell item to a specific value, so later, I can query the DB with those two items.The issue, is that I can't seem to figure out how to access the DataGridViewComboBoxCell Item's Tag property.[code]I wrote it on the spot and it wasn't until later that I realized that I'm setting the Tag property of the DataGridViewComboBoxCell itself and not the DataGridViewComboBoxCell's Items.
View 7 RepliesWindows - SelectedIndex Of A DataGridViewComboBoxCell?
Mar 21, 2012How do I set SelectedIndex of a DataGridViewComboBoxCell?The code fill the combobox with items, but I need to select one of them My Code:
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Asp.net - Dropdownlist Is Cleared On Page Postback
Apr 8, 2011I have a FormView bound to a SqlDataSource on my page. One of the controls on the FormView is a DropDownList, which gets populated on Page_Load (it's being populated with a list of file names from a specific folder).
Everything goes well when the page first loads. I am able to view the list of files, select one and, upon hitting the "save" button, store the correct filename in the database. However, when the page refreshes after the post back - the DropDownList is empty.
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Checkbox When Unclicked Cell Not Cleared
Jul 7, 2010I have the code below which works fine when checkbox at Cell 2 is Checked ie., the date is inserted in Cell 9. Now, when I uncheck Cell 2 I want the Cell 9 to be cleared. Presently, it is not cleared after unchecking. [code]
View 5 RepliesWhat Is This List Of Objects (arrayLists) Being Cleared?
Jul 12, 2011I am obviously not understanding something about scoping that is very basic. I have a very simple class:
Public Class testListClass
' This just contains a single list that is set by a property or the constructor
Private classArrayList As New ArrayList()
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Fill DataGridViewComboBoxCell Items With An Array?
Mar 1, 2012I have a TextBox column in my DataGridView. When the user clicks one of the cells in the column I turn that cell into a DataGridViewComboBoxCell and fill the items using the columns Tag property which is a 1-dimensional array with 3 items. This is what my Tag looks like:
?CType(sender, DataGridView).Columns(e.ColumnIndex).Tag
{System.Array}
(0): ""
(1): "No Reportable Result"
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Setting CellTemplate Of DataGridViewComboboxCell Cause DataError
May 28, 2012I am using VB 2010 Express to create a windows forms application with an unbound DataGridView. The DataGridView has multible columns, two of which are ComboBox Columns. I would like to make the borders of the cells be bold when selected as some type of indication to which cell is the current cell. It is possible that I overlooked something completly but I could not seem to find a property that would allow this to happen.
My solution was to create a custom class which inherits from the appropriate DataGridViewCell type (e.g. DataGridViewTextBoxCell, etc..), in that class I override the Paint sub. There I check the selected property and draw a rectangle using the cell bounds.
This works with every type except the DataGridViewComboBoxCell. On the columns of this type I receive an ArgumentException on the call to the Paint Sub. Even if I just have an empty class that only inherits from the DataGridViewComboBoxCell.
Again, it is quite possible that I have overlooked somthing and am making the a lot more complicated than it needs to be.
System.argument Datagridviewcomboboxcell Value Is Invalid
Feb 19, 2009i encountered a problem but this happened on the client side. In my PC, i don't encounter this error.
The error is: System.argument datagridviewcomboboxcell value is invalid
Is there anyone who encountered this problem? Could the client's PC needs updating on a certain dot net fix?
System.ArgumentException: DatagridViewComboBoxCell Value Is Not Valid?
Jun 5, 2009I have an error but will explain how i set up my db:Two tables, One is called Area and the other Postal_Code.
The aim is to assign a postal code to the area.Sometimes we add postal codes and sometimes these codes change or need to be deleted.I used the wizard to create the datasets and dropped them on two forms linked to a SQL db.We can Add,Edit,Update & Delete so all is working fine there is no relationship between te tables as they dont need to be linked, I only require the PCode to me added to the Area Table, not any ID or Index etc.
One of the fileds in the Grid on the Areas form is the Postal Code, its set to a combobox that when the user is adding it gives them a selection of postal codes to select from.I get the error when loading the datagrid on the Area form: System.ArgumentException: DatagridViewComboBoxCell value is not valid
This happens only when the postal codes are changed or deleted in the Postal codes table.
I know what causes the error - the dropdown on my Areas form looks for the value in the Postal Code table and does not find it beacause it has either been changed or deleted.Im doing this manually - I go into SQL and remove the postal code data from the record.Then the form loads with no errors.
Q: Is there any way when the Datagridview loads that I can tell it when the PCode does not exsist in the Postal Codes table that it should rather leave it blank and warn the user that there are errors they need to fix befor they can save.
VS 2008 DataGridViewComboBoxCell Dropdown List?
May 6, 2010Given a datagridview, using complex binding I have a datagridviewcomboboxcolumn that displays data from a different table. My question is: when the dropdown list of the comboboxcell is shown is it possible to display a different text than the DisplayMember, lets say more detailed?I search for a solution but could not find any.
View 3 RepliesAsp.net - Browser History Cleared After Navigating To A Pdf Via Href?
Feb 23, 2009I'll start off by saying my website has a landing page of http:[url]....
On PageOne.aspx, I have a link to another page: http:[url].....
On PageTwo.aspx, I have an link to the following:
<a href="http:[url].....
The /MyFiles/ directory is actually a virtual directory which points to a file server that holds many other files (PDF, jpeg, doc, etc.).When I navigate to PageTwo.aspx from PageOne.aspx, I can click "back" and still get to PageOne.aspx (my browser history is ok). When I click on the link on PageTwo.aspx, the PDF opens in the same window...then I can click "back" to get back to PageTwo.aspx, but I can't click "back" again to get to PageOne.aspx (it seems like my browser history has been reduced by one page).
I can only imagine that this happens because of the virtual directory since I can't duplicate this problem if the PDF resides on the same server as my .aspx pages. If that is the case, does anyone know how to get around this and still have my PDF reside on the file server (virtual directory)?
C# - Text Inside Textbox That Must Be Cleared When Clicked
Oct 9, 2009I am using ASP.NET. I am not sure what you will call this but I would like text to be displayed in my text box called txtName. So when the form load the text box will have faded text that will say "Required". Then when the user click inside the text box i want the user to place a value inside the text box. Is this possible in ASP.NET? If so, how can this be done????
View 5 RepliesDataGridViewRow.IsNewRow Not Cleared After Setting DataGridViewCell.Value
Jun 18, 2009DataGridViewRow.IsNewRow property is set for the bottom (empty) row. If I set a cell value in the bottom row using DataGridViewCell.Value, IsNewRow remains set. What is the correct way to programatically set a cell value in the botton row to clear IsNewRow?
View 4 RepliesTextboxes Cleared But Memory Remains Stored
Apr 28, 2009I am working on completing the Clear event for Button Clear Sub routine. I have been able to clear the textboxes with the code I already have. However, in playing with the application, I noticed that the memory remains stored somewhere in the program. How to both clear the textboxes, and clear the memory?
Code
Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
txtTestScore.Text = ("")
lblNumberOfScores.Text = ("")
lblAverageScore.Text = ("")
lblBestScore.Text = ("")
txtTestScore.Focus()
End Sub