RE DataGridView Not Populated
Feb 18, 2010
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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.
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Oct 20, 2009
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?
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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?
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Jun 11, 2010
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))
[code].....
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Nov 18, 2009
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
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Jan 28, 2011
VB2008 & mysql
Is it possible?
If so how?
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
Top grid showing only NEW jobs
Middle grid showing only JOBS IN PROGRESS
Bottom grid showing only COMPLETED jobs
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Apr 3, 2009
how can add icon to the left side of the item populated on a datagridview (just like in a listview)?
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Dec 12, 2010
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 =
[Code]...
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Apr 8, 2009
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?
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Apr 29, 2010
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()
[code]......
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Nov 25, 2009
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
[code]....
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May 12, 2010
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
[Code].....
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Jun 22, 2011
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.
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Dec 28, 2010
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();
[Code]......
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Apr 9, 2009
I am adding items to a combobox through user entry and need to save them, so when I close the application down, they will reappear when again opened.
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Nov 14, 2011
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
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Nov 24, 2010
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.
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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)
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Mar 16, 2010
I need access to the information in a populated listview so that I can load some textboxes with the contents of the selected row.
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Jan 6, 2009
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?
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Jan 26, 2010
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
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May 17, 2011
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
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May 24, 2012
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
[Code]...
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May 10, 2010
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.
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Apr 6, 2012
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
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Apr 15, 2010
I'm using visual basic 2008 express I have 1 combobox which is populated from a coloum from my database, when I select a value from the combobox I wish to populate several textboxes with data from the row selected. I have created a dataset. How can I do this? Is there a tutorial I can read anywhere
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Jan 7, 2011
I hav a program that has an icon in the system tray using Notifyicon, i have linked this with my Context menu so when right clicking the tray icon, you get the Context menu pop up.I have a list of URL's that i have read into a string from an SQL database, i want to show these url's on the Contextmenu. and then when the user clicks on the url, for it to open the url in iexplorer. I have read through stuff online but i'm very lost!
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Nov 18, 2009
I am adding a DataGridViewComboBox Column to a DataGridView. The column is added But when I click onto the dropdown arrow, nothing show up in the cell.
Dim lstCol As New DataGridViewComboBoxColumn
lstCol.HeaderText = "Type"
lstCol.DisplayIndex = 0
[code]....
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Feb 27, 2010
this is my code -
[Code]....
this shall populate the dropdownlist data, but in the value i need it to pick up the "ID" field from the stored proc. the stored proc sends two parameters, ID and Name. so i populate name, but how do i populate the id in value like this -
[Code]....
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Sep 17, 2009
I'm trying to create a form application in which the user is prompted to enter a date in a textbox by clicking on a button next to it that would popup a calendar. Then the user would select a date from the calendar and the textbox would be automatically populated with the date selection. The user could also just type it in, but I would like to have some kind of validation before accepting the date. I will be converting the date to an integer in this format YYYYMMDD to pass it to a query on a SQL Server 2005 database. Don't ask me why they're storing dates as integers I have no idea I'm just working with what I have hehehee. I've been looking online and trying different things but haven't been able to figure this thing out.
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Oct 6, 2010
I have several .txt files (equal matrix, say (200,15) polated with integers) and I need to read and merge them into 1 file (matrix elements aggregated), then this resulting file to be used for loading a grid. Is there any rapid method to do that?
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