Inform User That A DataGridView Is Being Populated?
Oct 19, 2009
I am writing a program in VB.Net to manage text messages sent through an API. It allows you to view messages in a datagridview and filter by date, sent/unsent etc...
To load the messages I'm executing an SQL statement and retrieving a DataTable which then gets set as the DataSource for my DataGridView control.
The problem is that depending on the filters selected the user could be selecting a lot of records and it would take some time for the DataSource to update. I want to inform the user of this load time by providing a progress bar or label of some kind.
I have used progress bars before when looping through data but this is loading it all at once. I thought of displaying a label when the user clicks to load the data and then hiding it when the data is loaded. But this happens instantaneously even when the data is still loading.
Is there an event on the DataGridView I can use perhaps?
I want to display a message box to inform a user of a requirement. In this case, the requirement is to insert a USB flash drive. This is easy enough:
MessageBox.Show(blah, blah, blah)
This message box will only have an OK button. What I need to happen is this:The OK button should not be available (enabled) until after the flash drive has had a chance to initialize. We will say this takes 2-4 seconds. So how to I keep the OK button disabled during this time and then enable after the time has passed?
I'm using a DataGridView to post the results of LINQ-from-SQL query. I was hoping that the data would be editable in the DataGridView, but it isn't. I made sure that DataGridView.readonly = false. I'm using VB.
VB 2008 DB = New CXToolDataContext() Dim Systems = (From TBLSYSTEMS In DB.tblSystems, TBLSYSTYPES In DB.tblSystemTypes _ Where TBLSYSTEMS.ProjectName = projectnumber And TBLSYSTEMS.SystemType =
I tried binding a DataGridView to a DataSet using the DataSource property but no data appeared in the DataGridView. I placed a DataGridView in an empty form, making no property changes except for the name. I did not create columns in the DataGridView. In the form's load event I placed the following code for loading a dataset named ds Executing in debug mode, I confirmed that there was data in that dataset. No column headings or data appeared in the DataGridView. What am I doing wrongly? There are 34 fields (columns) in the DataSet - maybe it exceeds the capacity of a DataGridView.
How do I add rows that have already been populated. I saw a param that took an array. I have 8 columns, so would I need 8 elements in my array when I add them I have the code: me.datagridview1.rows.add() But I want to modify the data in the row using code, how would I go about doing this?
How do i delete a row from datagridview and datasource that is populated by a class file?dding of item goes like this, but not not sure how to delete the item.
Dim dt As DvdEzyDataSet.DVDCopyDataTable = DvdCopyDB.getDvdCopyByID(CInt(txtCopyID.Text)) Dim dr As DvdEzyDataSet.DVDCopyRow = dt.Rows(0) Dim dt1 As DvdEzyDataSet.DVDDataTable = DvdDB.getDvdByID(CInt(dr.FK_dvdID))
I am having problems deleting any rows from a cascaded DGV. I get a run time error complaining that I am breaking a constraint almost as if LINQ is try to delete from the parent table. I have 2 DGVs on a form one displaying Species and the other all SubSpecies for the currently selected species and that works fine.
However when I try to delete a SubSpecies I get the following exception:- An attempt was made to remove a relationship between a Species and a SubSpecies. However, one of the relationship's foreign keys (SubSpecies.SpeciesID) cannot be set to null. At first I thought the error was raised by SQL server due to the Cascading Delete limitations on L2S but the error message for that is very different the DataContext.Log doesn't show any attempt to change the data.
The code used to bind the DGV's is as follows:-
Protected Sub BindControls() Try DC = New DataClassesWhatToPlantDataContext
Wanting to have multiple datagridviews showing unique information (via filters?) based on cell content all coming from one data table.
Example: 3 datagridviews accessing the same datatable that has a [Job Status] column limited to one of the following 3 entries NEW, JOBS IN PROGRESS or COMPLETED and having that column hidden from view on all gridviews
I have a DataGridView on a form that is being populated from a SQL table dataset by giving criteria from a previous form. I have 6 columns in the dataset, of which the last column should be combo box column containing items "Done" and "Pending". How do I make this bound column to a combo box column and display the value as well as the alternate item too in the combo box?
I have a DataGridView where Cell_Validating is being done. I have a Cancel button on my form that allows the user to exit out of the DataGridView changes. The problem is that if a cell was currently flagged as in error, I cannot exit and remove columns from the DataGridView. I get the following error: Operation did not succeed because the program cannot commit or quit a cell value change. Is there a way to cancel the validation once the focus has been removed from the DataGridView? Here is my Cell_Validating
I have a combo box and onload I want the combobox to be populated with data in a field from the database. However, when I execute I receive an empty combo box please could someone look what am doing wrong..
Private Sub populatecmbprojtype() Dim cmd As New SqlCommand Dim conn As SqlConnection = GetDbConnection()
I am having a strang problem with button event handlers that I am creating at runtime.Actually if I set the form as startup form everything is working fine but when I set the main apllication form as startup form the events for buttons created at runtime are not firing.I am posting the code so that you can have a better look and see whts wrong?I have two classes under spotlight here "Class1" and "Grid"I am creating an instance of grid in class 1 and in a sub in grid I am creating buttons dynamically as follows and adding event handlers
For i As Integer = lIndex To uIndex Dim btn As New Button btn.Name = ds.Tables(tblName).Rows(i)(btnName).ToString
In the code below in the btnAmountEarnedClick event, the lblResults is not being populated.
Private Sub cboRecycleSelection_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboRecycleSelection.SelectedIndexChanged
I have several combo controls that need to be populated with a specific ID and name. I want the user to choose the name and have the ID in the background. Later when the data is exported from the database the specific ID's are exported and not the names.
I see that I can create the items in the combobox rather easily using their names. However, how can I associate the ID number for each of the items. Private Sub frmReceipts_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' Add receipt types to combo box cboReceipt.Items.Add("Monetary") cboReceipt.Items.Add("Inkind") cboReceipt.Items.Add("NSF") End Sub
I thought it would be better to have a seperate table with the different receipt types and then somehow connect/link the contents of this new table to the combo box on this form. However, I am at a loss on how to do this.
I have set up a search form so that when the user enters a character, a search occurs. I have some code behind to do the search. The code I am using is as follows:
Javascript:
<script type="text/javascript"> function TextBox_OnKeypress() { document.getElementById("ctl00_MainForm_ibtnSearch").click();
I'm using this line to populate my combobox with all files in my application path:
ComboBox1.Items.AddRange(IO.Directory.GetFiles(Application.StartupPath))This works fine, however it displays the path as well, and I only want to display the files with extension .txt
I am fairly inexperienced with using datatables in VB. My question is this: Can I access a particular column of a table by name if it is not defined elsewhere like when I populate a datatable using sqldataadapter.
[Code]...
Is this the way it can be done? I believe this is the case, but can't find any definitive examples online (probably not searching properly)
I have a DataGridView in my Form. I am adding a handler as follows:
Private Sub DataGridView1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGridView1.SelectionChanged If Me.DataGridView1.SelectedRows.Count > 0 Then
I would like to have the datagridview adjusted by the user. What i mean is: teh user to be able to resize it just by dragging the side or the corner of the datagridview. I use vb 2010.
I'm having an incredibly frustrating problem with datagridview that seems like it should have a very simple solution, but I haven't been able to find it yet.I have a form with a datagridview on it that is only usually 1 to 2 rows long but can be much longer. So when the form loads it populates the datagridview with values for however many rows there should be, and there is a blank last row. On the column header on that last row is an asterisk. If you click on the asterisk or anywhere in the blank line, it adds a new row where you can enter data, however, the blank line with the asterisk does not move down to be under it. In fact the asterisk stays on that line, and if you click anywhere on that same line, it adds another row, placing it on top of the one that was just added, and this can happen forever. I have a sub that refreshes the whole table and repopulates, however I can't run it in the new line code with an "Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function." which I can't seem to get past. If I exit the form however and come back in (it runs the refresh on loading), now all the lines that were added show up, with a blank line with an asterisk at the bottom.
I'm trying to add functionality to my DGV that enables the user to edit the cell data and then save it to the datasource but I'm not getting very far. Right now, I'm just concerned with the editing the DGV part.
What's the best way to do this taking into consideration: A column of type date in hh:mm format will not edit. At the moment this column won't display the new edit and if I attempt to enter and display a string instead of a hh:mm rime format, I get an error)I need to provide validation for the value that is entered.There are loads of events for DGV cells
I'm having trouble using an arraylist with an object. [code] The arraylist Phrase gets populated with 4 objects (WordObject) filled with the word "Fox".The arraylist AnotherPhrase gets populated with strings "The", "Quick", "Brown", "Fox".Why does the Phrase Arraylist do that? Shouldn't there be 4 objects each with different words?
withautopostback=true? i am using vb.net and have 50 checkboxes that shall show up from the database data depending on the selected value of the previous dropdownlist. also can i change the label of the checkbox
I have a test Listview with four rows. In the code below when I start at the top and check each row the textbox is populated with the selected value. When I randomly check a row the correct value (checked row) does not consistently populate.
Private Sub lvwInjuredWorker_ItemCheck(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles lvwInjuredWorker.ItemCheck If lvwInjuredWorker.Items.Count > 0 Then For Each lvitem As ListViewItem In Me.lvwInjuredWorker.Items [Code] .....
I have a checklistbox and I'm running the following
Public Sub ProcessCompanyAssociations() Dim clientID As Integer Dim fullname As String Dim CheckedItems() As String = frmMain.clbCompanies.CheckedItems.Cast(Of String).ToArray Dim UnCheckedItems() As String = frmMain.clbCompanies.Items.Cast(Of String).Except(CheckedItems).ToArray
I have a project that currently uses an XML config file to create some groups. Based on these groups, you can search a database for information. What I want to do is create a form for editing that file. I can get to the information via messagebox, but when putting it into a ComboBox, I can't get the list updated. I have tried the text property which only populates the initial selection, and the Items is a read-only property. Nothing else looks close to what I want to do.
My other thought is to populate a datatable with the information and then populate the combo box from the database. It seems like an extra step that I shouldn't need, but it may be the only option right now.
The reason it can't be hardcoded is that the XML config file is already being used by a program, and the file may be updated from two or three computers, meaning I need a central location for the file.
I'm trying to get a combobox to be automatically filled from a text file and have it editable by the user.
So far, when the program is running I can add new items and they appear in the text file and combobox but when I restart the program the combobox list is empty even though the text file has stuff in it.
Dim w As New IO.StreamWriter("z:url.list.txt") Dim linecounter As Integer For linecounter = 0 To ComboBox1.Items.Count - 1
