I'm trying to load data from DB with a BackgroundWorker but I'm getting the follow error:
Quote"Cross-thread operation not valid: Control 'DataGridView1' accessed from a thread other than the thread it was created on" Well I didn't created any other thread or call it from other place, my code is just:
[Code]...
What is the best way of quickly loading a datagridview with thumbnails of images and filenames/paths found within a particular folder using a backgroundworker without affecting UI performance ?
While loading, I'd like to continuously filter the dgv's image column through a textbox to display results as the user is typing.
how to safely load a datagridview via a backgroundworker while showing progressbar feedback ? My data is coming from an access mdb.
View 4 Repliesin my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
Whenever i start my form (window application) and link from one form to another, my data doesn't load but when i close the respective form and open it again , it appear. Can i know where is my problem ? Thx in advance. Here's the code snippet :
Private Sub AccessControl_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim sqlstring As String = "select * from depttable"
Dim connection As New SqlConnection(db.cs)
Dim dataadapter As New SqlDataAdapter(sqlstring, connection)
[code]....
I have a couple of tables in a sql server database and i want to load the data from them in form load.
Here is the code i use to load the first table
connection string here
Con.Open()
Dim objCmd As New SqlCommand("SELECT * FROM Customers", Con)
Dim cust As SqlDataReader = objCmd.ExecuteReader()
[Code]...
i hve create combobox & text box and add database source to my project...i know how to binding data or load data to combobox using SELECT query..but can i change SELECT to INSERT query cz i wont when i type data into textbox,data will be in database...second..can i binding without add database to project..i mean mydatabase in debug folder..i hve problem binding data if database is not in myproject..
View 7 RepliesI have a datagridview which have 5 columns. The name of the columns are T,C,F,S,H. [cod]e...
So i want to display this data in datagried view. I must display the number beside T to T column, the number beside C to C column and so on. It should only display number in the respective column. It should not display the T,C and so on. [code]...
i'm in the need to start a backgroundworker inside another one.Now...The first one BGW starts a for cycle, and inside this one there is the second BGW that has to upload an image to a server.The trouble is that, the progress event and the complete event of the internal BGW are never called.
View 11 RepliesI have a data grid view on a FrmItem Form, data grid fill with table item master and item master have 1 lack item. when user click on item text box then FrmItem Form call and when user choose any item then FrmItem form close and it return item code.The problem is every time when user press any key on Item text box, Frmitem load 1 lack item which takes a lot of time around 10 second.So i want Data grid fill when i start application and use that Data grid on the Frmitem form.data grid is already loaded and its not take more time. may be its show with in seconds.
View 4 RepliesI am trying to load a xml file into a data set by loading the information into a data row. when i try to complete the task it throws a nullReferenceException. the row has data in it and i used the code earlier and it work.
[URL]
Imports System.IO
Imports System.Xml
Public Class frmMain
[Code].....
I just discovered the joys of UserControl's and I was wondering if it is possible to populate the usercontrol with data from a database in the UserControl's Form.Load event instead of the form the userControl is placed on. I feel it would make using the control a lot easier if it just populated itself without anymore code.I tried it with a ListView but it gave me a bunch of errors, so I didn't know if it had to be done a certain way or if it was just one of those things that doesn't work no matter what.
View 8 RepliesI am trying to load data from one datagridview into a datagridview, make change in datagridview, and use update function to update change back to initial datagridview.[code]...
View 12 RepliesThis error occures when I try to load my data into a datagrid with btnTonen or frmLoad after starting up the program. But after I do something else in the program the data will acctually load when I click btnTonen.
Private Sub btnKlantTonen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnKlantTonen.Click
Dim strSQL As String = ""
strSQL = "SELECT * FROM tblKlanten ORDER BY fldKlantNaam"
[code]....
I have been dealing with this problem for quite sometime. I am really hoping that my friends at EE will be able to give me a viable solution.
I am working on building an application that reads and stores information about documents (access databases, excel files, word documents) into a database.[code]...
I would like to put the items in my database to a textbox
Public Class Form1
Public cn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & My.Application.Info.DirectoryPath & "\dbase.mdb")
[Code]....
im new to vb.net.i have two forms.first form contains two textboxes and a view button.when i click my view button second form open and it displays datagrid contains values.this works properly.but i want do some more. when i double click the datagridviewcell of second form how to pass the particular cell value to my first form's textboxes.
View 14 RepliesI want to make a program that can get data on a web page such as game stats. The data is already on the web page, and it is readable, I need to know how how to make the labels on program sa the words or numbers on page. I know a little about html and what not so if it has to do with html than I should be able to do it.
View 7 Repliesi have an error when executing this
ExecuteReader: CommandText property has not been initialized
I am creating an application that is a services calculator. The user selects various options and an amount is calculated. I do not want to hard code the values due to the potential for pricing changes then I would have to change the pricing as opposed to an authorized user. I do not want to use a database, and this will be an offline application
View 6 RepliesMy code is working fine I just need a way to reset the DataAdapter1 into 0 (like reset) So if the user hit the button search 2 times to shows up only 1 time the elements of database "product".. If i used the code below and hit 2 times the button the DataGridView show 10 product for examplat the first time and +10 for the second, a total of 20 products, even if I search then edit a product and search again it's fixed the previous table and prints again 2 times the table....
DataAdapter1.SelectCommand = Sql2 ''database load
DataAdapter1.Fill(ds2, "products") ''dataset
DataGridView1.DataSource = ds2
[code].....
i create 2 combobox in form, comboproduct & combomodel. i using accessdatabase and using oledbconnection..database in debug folder... i create 1 table, i name it"stock" & 2 column.. first column is product,second model..
i wont load data in product column into comboproduct and model to combomodel..like binding data..
This is the first time i am using an DGV and also an DB.I have written some code,but i am not sure whether it is the correct way of doing.Basically i want to load the data from the db and display in the dgv. I only want to display the data , manipulation of this data is done using other form.I am setting the columns manually because i want to use the same dgv for multiple purpose
vb
Private Sub LoadDivisions() Using conn As New SqlConnection(My.Settings.IDSConnectionString) Using cmd As New SqlCommand("select * from divisions order by divname", conn) [code]......
I was wondering what is the easiest way to save and load data through different forms in vb. I just want to save 3 textbox.text that a user saves and be able to load it on a different form.
View 3 RepliesI understand how to read lines from a simple text file and loading them as variables to be used in an equation doing the following:
Private Sub ReadButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ReadButton.Click
[code].....
I have a form with a listbox that when the form is opened I need it to display info from a file. I don't know what would be easier to work with Excel or a txt file, but it is in this format:
Phillip Frank
3/19/1990
3
999-555-8618[code].......
I would like it to populate the list box when the form is loaded, but if I have to use a button to tell it to load that is fine also.On the same form I have 4 textboxes that ask for each of the above items (name, DOB, Level, PH#) and a button that when pushed I want it to save it to the same file where the above info was pulled from in the same format.The Show Contacts button doesn't have to be used if it is not needed.
Let's say I got a Dictionary type object holding some important info. Well, my user wants to close the program and work on it later.
How do I save the Dictionary and other variables in one single file, which can only be read by my program itself?
I have problems with a form and load event.My form manage items that can be added, deleted or modified. In load code, I initialize all vars to cero. This is OK to be ready to add items.
My problem is with modify and delete. To carry this, I must load vars from a source. So, in my foreing code I have this:
[Code]...
My problem is that when showdialog is called, all data which were loaded from duplicar funct is put again to cero. How can I avoid this and load correct data into the form.
I have more then 3000 data in my database when i load this data in my form its work very slowi try to load this data at my application load but cant quarry form this
View 10 RepliesI have a Lightswitch application that is running fine, connects to the database and shows the data just fine. I am trying to write another one using the same database but I get the error "Unable to load data". I can't find anything I've done differently with this application. I can connect to the database in the development window and see the data by using the View/Server Explorer and show table data.
View 3 Replies
