In my project,, I have three forms. In my main form, I have a DataTable filled with some data from a MySQL-server.In the two other forms, I have a DataGridView which is bound to a BindingSource, which again is bound to the same DataTable in the main form. So It looks something like this:
Datagridview Datagridview
| |
BindingSource BindingSource
[code].....
I use vb.net and windows form and sqlserver
I added Data Source(Microsoft SQL Server (SqlClient)) to my project. and now I need to change it to ODBC Data Source .
I have a ComboBox which is bound with a DataSource from (obviously) a Database. However, there are 659 different entries inside this Database and I was hoping to tack on AutoComplete.
I tried setting the Source to the ListItems since, after initialization and the data is bound, all the items necessary are in fact inside the ComboBox so I had assumed that it would pick that up. I was wrong. I tried using a Custom source but VS errored out saying that I couldn't do that since the ComboBox was bound.
My question is, how can I utilize AutoComplete's "Suggest" mode with a bound ComboBox?
I'm having an issue wherein my combobox is populated from a datasource (access database >> [URL] and unwanted duplicates are shown.
-Example- [URL]
How can I make it so no duplicates arise?
Also on another note...I'm having difficulties linking the 2nd combo (model) to the first (make).
I would like the program to function in such a manner that
>makeCombo is populated from the database
>the user selects the Make of the vehicle from makeCombo
>modelCombo is populated from the database according to the make selected
>the user selects the Model of the vehicle from modelCombo
>user hits search
>datagrid is populated with appropriate vehicles
I am customizing a DataGridView control. The DataGridView is supposed to be bound to a collection of some type (be it a List(Of T) or ArrayList or whatever), and the idea is that one can easily determine (at design-time in this case) which properties of the type have to be shown in the grid and which column header name they should get. One can do this using an attribute. For example, if I have a class Person with Name, Age and HairColor and I don't want to show the HairColor property, and want to show the Name property as 'Person', I would use:
vb.net
Public Class Person
<Grid.GridOptions(displayName:="Person", visible:=True)> _
Public Property Name As String
[code]....
I do this during run-time by simply looping through the properties of the bound type (in this case Person), retrieving the GridOptions attribute (if any) and checking the values provided. This works just fine except for one thing: I'm not really sure how to determine the type in the databound collection...
At the moment, I cast the DataSource property to an IList and retrieve the type of the first instance in that list (if any). If there isn't a first instance (the list is empty) then I don't know how to get the type... Often I know that it will be impossible to know the type. If someone is binding an ArrayList for example, then it's impossible to know what kind of items he's going to put in that ArrayList. Even the normal DataGridView cannot show any columns when databound to an empty ArrayList. However, the framework's DataGridView does show the columns when bound to, for example, an empty List(Of Person), or a Person array.
I'm pretty sure that casting the DataSource to an IList is not the correct way as all information about the type of items in that list is then lost. But I'm not sure what else to cast it to... ITypedList? IBindingList? I even considered List(Of T) because that's all I am going to be using, but besides the fact that the grid would then obviously only work for a List(Of T) I still don't know how to do this... I don't know 'T' so I can't cast it to a List(Of T)...
I have a ReportViewer showing a report that is bound to a dataset. The dataset gets its data from a Access database backend. I have a separate form that allows the user to add/update/delete data. My problem is when the user makes changes to the data using the data entry form, the report does not reflect those changes. I have to close the entire program and reopen it before the changes take effect on my report. This piece is used to bound the report to the dataset
[Code]...
I am converting a VB 6 app to VB.Net. In the vb 6 version I have a table that contains roughly 80 fields. Over that table the users currently have a single form which gives 12 diferent views. Each view is placed on a different tab, which, although giving a distinct set of fields per tab, also leads to a ton of duplicated code. Changing the underlying table is not an option.
What I would like to do is to use a single datasource (containing all 80 fields), a single datagridview on the form, and have a combobox act as the filter choice for the differing views. Does my solution seem like the right way to handle this? If so, I'm not sure I know which controls would best be used.
Like i want it to read the lines i have in the text file but i get an error Each time i press the button Why?
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim objreader As New System.IO.StreamReader("C:UsersJamesDesktopMusicas.txt")
Do Until objreader.EndOfStream
[code]....
Error:
Quote:
Items collection cannot be modified when the DataSource property is set.
Error line
Quote:
ListBox1.Items.Add(objreader)
I want to know how to perform row delete to datatable which is a datasource to the grid.
In details: I have a datagridview (dg) and its datasource is set to dtItem. User will select some rows in dg and press 'delete' button.
dg.DataSource = dtItem;
I will perform a loop and delete the records. Here is the code eg:
foreach (DataGridViewRow drw in dg.Rows)
{
if (drw.Selected)
[Code]....
The problem is it didn't delete correctly. If user selects row index 0 and 1 in dg and delete it, it will delete the first one correctly and then finished cuz no more row is selected in next gridviewrow.
I tried google and didn't find what I want. may be because i don't know the correct keywords I should use to search.
1) Do you typically allow Deletions, Additions, and Edits in a DataGridView?
2) Have you found any simple way to use combos in a DataGridView? (See edit below.)
3) What type of binding do you typically use on a DataGridView? Do you manually code it? Bind it to an custom BindingSource object?
I'm accustomed to programming in MS Access and I'm now working on learning VB.NET. In Access I typically use updateable DataSheet view bound forms but this doesn't allow me to separate my business logic and create a Data Access Layer. Now I'm trying to figure out how to have an updateable DataGridView in .NET together with separate layers for Business Logic and Data Access. So far I haven't really been able to make sense out the many things I'm reading about this.
I need my DataGridViews to be easily sortable, filterable, and allow up to 10,000 records to be displayed at one time. I've achieved this using ADO.Net with standard DataTables (all written in code) but all my business logic and Data Access is in the code behind my form.
Edit:I guess I was under the impression that ComboBoxes are really difficult to use in DataGridViews so that's why I had posted question #2 above. I think I need to research this a little more as it's probably not as difficult as I thought it was but it doesn't appear to be anywhere as simple as a combo in MS Access. However, I realize that MS Access has many other limitations that VB.NET does not have.
I think I already know the answer to this, but I figured it would not hurt to ask.
Is there any possible way to nest Databound DataGridViews in .NET? What I would like to have happen is for each row in the DataGridView to have a button to expand, which would then give me a DataGridView underneath that. I would like this nested DataGridView to also be able to do this, so I could go n levels deep with them.
Is this possible with the .NET Winforms standard DataGridView? (Or another standard .NET control?) I have seen people reference some third party controls, however they are really expensive, and I don't really want to go that route.
I want to copy a DataGridViewRow from DataGridView to another but when I try it I get this error:
InvalidOperationException: Row provided already belongs to a DataGridView control.
is there any other way to copy a DataGridViewRow ?
I wrote a program using VB.NET. When I run the executable, it displays a DataGridView that may (or may not) have rows in it. The user can enter data, or hit an Update button to fetch data from a database. (The grid is NOT being used as a DataSource.)The user can also set the font with another button: DataGridView1.font = "..."
If the grid DOES have rows in it, everything works as expected and the font is used in the grid.If the grid does NOT have rows in it, the font does NOT change. Even after the user hits Update, or types in data.He has to entirely exit the program, and rerun it to see the font actually change.
Question: How do I set the font on the grid, regardless of whether it:
Has rows.
Doesn't have rows.
Will have rows later.
I would think DataGridView1.font would ALWAYS change the font. No?
I have an idea, but i am not sure how to implement it with code.I have an application where a user can view current bookings for rooms.I have two datagridview controls, the first one shows the rooms and the second shows all my current bookings.What I want to be able to do or more the user, is click on a room and the current bookings for that room (datagridview1) to be shown in (datagridview2).What I think I need to do is apply a filter and a sort in a sub routine, then link my tables with a binding source.
View 1 Repliesim searching the best way for Printing a whole form / Several Datagridviews and some Specific controll contents in my WindowsForm application.
I know the internet is full with bad and good examples. Its hard to separate the Good examples from the Bad examples.
I have two relayed tables (teams and players) and two datagridviews. In the datagridview1 i have a combobox with datasource <teams>.In datagridview2 i have a combobox with datasource <players>. In this combo i can see all players. I want to filter and see only the players related to the team of the combo in the datagridview1.
View 10 RepliesI have 2 forms (form1 and form2). I'm passing 2 numbers from form2 to form1 (see image/attachment). I want to make sure that 1 of those 2 numbers (passed from form2) aren't the same as any number on form1 in column2. For example, if I were to pass the numbers "2, and 3", the program should give an error saying, there is already 3 in column2. It doesn't matter if the first number (in column1) is the same, but the second number should NOT be a duplicate of any number in column2.
View 7 RepliesI am novice at best with VB. I have a dataset built from a complex query. Well I have a lot more items in the dataset than I wish to show in a datagridview. Some items will be used for other purposes at the time, filling txt boxes, dropdowns, etc...all independent of the dgv. I am lost at how to fill just a 3 or 4 of the items rather than just filling the entire thing. So, instead of just filling the entire ds into the grid, how would I fill in selected columns into the datagrid that has specifically named columns at runtime?
View 2 RepliesI have a datagridview with two columns; one named Names the other named Scores. This is my code so far Dim hScore As String() = New String() {strName, lblPercent.Text}
[Code]....
What I want it to do is sort the scores by greatest value to least value, but the problem I'm having is that the scores are stored as strings so they are being read and sorted from left to right. My question is, how do I store the scores in a numeric array and place them in the same row as the name, but in the second column? The names and scores only need to be stored as long as the program is running so I don't want to add anything to the registry or create new files to store them.
I have 2 datagridviews on my form. One lists products and when you click on a product in the first datagridview the other lists tests for the selected product. I have a products table with a productid,productname and productcode. I have a tests table with a testid and a testname and I have a prodtests table with a prodtestid, productid, testid and a few other fields.
Public Class frmProducts
Dim myConstr As String
Private WithEvents ProductBindingSource As New BindingSource
Private WithEvents TestBindingSource As New BindingSource
Private Sub frmProducts_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code] .....
Also I need to add a combobox column to the second datagridview that is bound to my prodtests table and to list the testnames from the test table in a combobox. In my save button, should I just call both adapter.update methods to save all changes. I will add the appropriate update commands etc.
VB 2010 form has 1 panel, 1 DGV in the panel, 1 TabControl with 3 tabs in the panel each tab has a DGV all 4 bound to the same DataSet through code.
I have a form that has multiple Datagridviews on it, 1 in the main portion of a panel and the other 3 in a tabcontrol. If I click on cell 0,4 of DGV1 cell 0,4 of DGV2 is also "hilighted" and the same goes in the reverse order. If I click on cell 1,4 in DGV 1, cell 0,1 is hilighted in DGV2 (basically it stays with the last selected col and what ever row for that DGV).
This isn't the functionality I'm really looking for here, when I single click or change cells on any of the DGV's I don't want any of the others doing anything.
As you can see there are 2 cells selected this was created by a single click in the 4th cell of Param0
I have a problem with my DataGridViews, actually i have a form with a TabControl with 8 tabs, each tab have a DataGridView control. I'm populating them when the form load, the problem is that i got kind of a limit here, only 3 DataGridViews are getting populated, not 3 specific ones but any 3 i put first on my code. I'm populating them manually, doing a mysql query, filling a DataTable and then making the data source equal to the DataTable.
[Code]...
I have a Form with a TabControl with 8 tabs, each tab have a Datagridview that needs to be populated each one from a different table of my database. I'd like to know if i need to make all the 8 connections and queries or i can apply the DRY principle and how i can do it.[code]...
View 1 RepliesI use Visual Basis 2008 With MySQL. I Have one from with 6 (six) Datagridviews controls I Have the following problem: If i use Form1.Show method than the form1 is only show if data connections are made and all the datagridviews are filled with data What i want is to first show Form1 with alle the empty Datagridviews (6)controls and then After that i want that the program make the data connections and fill DataGridView with data. form1.show ' call form other Form
Private Sub Form1_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load 'in this Load event i make all the data connections en fill the datagridviews
i have a datagridview on my winform that is bound on the click of a node in a tree this is the binding code...
Dim myDocList As IList(Of DocumentTemplate)
myDocList = CorrespondenceHelper.GetDocumentTemplateByCorrespondenceId(Convert.ToInt32(e.Node.Name.ToString()))
'add new blank row at bottom
myDocList.Add(New DocumentTemplate())
[code].....
i added a blank row in because if i bound without it then i was unable to add new row.
AllowUserToAddRows = True is set also
but when i populate the blank row and tab of it i would like another blank row to be created below but unsure where/how i go about this?basically im aiming for teh user to be able to edit or add numerous records to the datagridview then commit all changes on one click (Save) at the end.
I discovered a problem in C# (boo hiss!!!) but it applies to VB.NET as well.I decided to build a little app to load info from some audio files using Taglib-sharp (nice little thing it is!) and create a Winamp playlist from the loaded files. (I know it's lame, don't laugh! I just wanted to learn some C#!)I have a form with 2 DataGridViews. I load the first dgv with some tag info from the selected files. I then move those files from 1 grid to the other, shuffling their positions along the way.The annoyance I found is during form design. If I try and name a column in the second DGV the same as in the first (eg. "Filename") I get an error that says the name is already in use by another component.To me this is not right. The column is part of a separate object, shouldn't this mean that "Filename" in object1 isn't the same as "Filename" in object2? I even have to refer to the specific object to get the column's value in a row. [code] to access the column's value in the first row of dgvMine or dgvOther, then why does the darn designer care if "Filename" exists in dgvMine and also in dgvOther? Shouldn't they be separate declarations "within" each of dgvMine and dgvOther?
View 4 RepliesI have a strange problem; on my form there is a TabControl, and every tab contains a DataGridView.I set all DataGridViews Autosize column property to DataGridViewAutoSizeColumnsMode.Fill and then I set for every column the width with FillWeight, using the same set of values for every DataGridView.Although all these DataGridViews should look the same, the one on the first TAB looks different, it looks like I used different FillWeight values.All others DataGridViews on subsequent tabs looks the same, only the one on the first tab looks different..
View 2 RepliesI'm trying to generate my own dataset and create parent/child relation on the fly so that the subsequent datagridviews (dgv) that will be displaying the information will filter each child dgv by the record chosen in the parent dgv (I hope this makes sense).
So far I am able to display info in each dgv, but every record from each corresponding table is displayed in each dgv- no filtering is occuring. I think the problem might be in how I'm creating the relation and/or how I'm linking it to the dgv. Here's the code I have on the UI:
[Code]...
I wrote a function that allows me to retrieve data from a single SQL table and place it into 3 datagridviews. The problem i am having is as follows:* Whenever a user types something in anyone of the datagridviews that information is recorded in all three of the datagridviews.I am seeking partnership to address my issue. I have enclosed my function that is called to populate the 3 datagridviews
Function SetupColumns(ByVal str As String) As BindingSource
Data_set.Clear()
Try
[code]......
I have an MDI application that shows MDI forms with a single DataGridView on each form. The grid is bound to a List(Of Item), where Item is some class. Now I need to be able to drag (possibly multiple) items from one grid (in one form) to another grid (in another form).
Unfortunately, I know nothing about DataGridViews and even less about drag and drop, so this is turning into a real pain for me...I have been looking at examples for ages, but none of them work for me. Most of them don't deal with databound items, others don't seem to work at all, and yet others can only deal with a single row at a time (pretty useless for me).
This must be something that people need a lot, so I can't understand why the examples are so 'bad'.