Write Some Code Which Parses Data And Then Populates A Listbox
Oct 24, 2009
I'm trying to write some code which parses data and then populates a listbox. I'm using the IPWorks IPPort component which basically does the reading of port 30003. The ipport1_OnDataIn event is where all the action is. I parse the data, which works great.. however when I try and do something simple such as add text to a listbox, I get the dreaded error "Cross-thread operation not valid: Control 'lstListBox1' accessed from a thread other than the thread it was created on".I've googled the error and tried copy and pasting some workarounds but nothing seems to fix the issue.
If anyone can offer help, it would be greatly appreciated. If you could possibly show the code already implemented into mine, it would be even better so I can see how it works. It would make more sense to me. My code is below. The part i'm trying to get working is the lstlistbox1.items.add("Test") in Case "2". This is to just get it working.. I'll be adding listbox items in the other cases as well, and they'll be parsed values instead of "Test". This is just to simplify things at the moment.
Is there a more elegant way to structure the following code, which takes a comma delimited string containing certain values in specific positions and assigns the values to the properties of an object?[code]...
I am developing a program that populates a rich text box and from a click event on a listbox. The data that is being loaded into the rich text box is located in a richtextformat file located on the hard drive. I noticed that when I entered a URL into one of the richtextformat files that it appeared that I was able to click on the text as if it were a link. So I wondered if it was possiable to click on that URL and open a web browser from the loaded richtextformat file? I have read several articles in regards to opening hyperlinks in rich text boxes which can open a web browser with a given URL.
I am trying to get my datagridview to display more than one row of data.Every time I call the program it only writes the 1st line of data in the datagridview instead of adding it to a new row.I have been looking on the forums for hours but combined with my inexperience I can not understand it. The following code is in a loop and it reads an xml file each time.The goal is to put the xml data from each file into a new row in the table.Public Sub ReadData(ByVal filename As String, ByVal file As String)Try
DS.ReadXml(filename) DS.Tables.Add("MyTable") With DS.Tables("MyTable")
I am trying to get my datagridview to display more than one row of data.Every time I call the program it only writes the 1st line of data in the datagridview instead of adding it to a new row.I have been looking on the forums for hours but combined with my inexperience I can not understand it.The following code is in a loop and it reads an xml file each time. The goal is to put the xml data from each file into a new row in the table.
I am trying to get my datagridview to display more than one row of data.Every time I call the program it only writes the 1st line of data in the datagridview instead of adding it to a new row.I have been looking on the forums for hours but combined with my inexperience I can not understand it.
I need to write data from a list box to an lsv text file. I can do that if I rea an entire line at a time and write it out, but the data in the listbox are columnated.For example:Cey,Ron 50 75 75 66.67would be an entire line from the listbox. It was entered into the listbox by reading an lsv text file and using format string to set up column info, but I don't know how to read it back out by column, only by entire line.
i just write code for application, in which data is get by user and entered data is to print in a particular format?give me a code for vb.net button by which after click on it will print entered data?
I am creating a reporting app that pulls information off of a Sql database and populates the data in a datagridview control (DVG). I am using tab pages (Tabcontrol), and I have about 10 tabs with within the control. What I have done is created a dynamic control that will populate in each tab page once the tab is selected. I am using a split container and in my split container.panel 1 is where all my buttons and search functionality will be. In my split container.panel2 to is where the main DGV control will be. I have got this to function properly, however now I am unable to add anything to my split container.panel1. I would like to add diffrent labels and buttons in the panel1 one without putting another panel on top of the split container.panel1, and also if i do this when I resize my container the panel will just sit there. I am using the selected index changed event to get my split container to show in each of the diffrent tabs
Private Sub searchTab_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles searchTab.SelectedIndexChanged searchTab.TabPages(searchTab.TabPages.IndexOf(searchTab.SelectedTab)).Controls.Add(splitContainer1)
I would like to write a code to read data from .gpx file, but I get stucked with classes: I have a problem with creating working array of objects in object and setting or getting data from it.
I wrote this:
Module Module1 Sub Main() Dim i As Integer
[code]....
but I get always the latest values of points for all slots of array... Lets say we got 3 points as an input: 1. lon: 5, lat: 1; 2. lon: 2, lat: 3; 3. lon: 4, lat:9. I always get the same values for i = 0 to 2... lon: 4, lat: 9.
I'm having difficulty figuring out how to run different programs with my VB program. Using Excel and other MS office programs is easy enough since I just add in the relevant COMs, but I can't for the life of me find out how to run other programs. I promise I spent many hours searching before bothering you kind folks here! I'd think this is a common issue so maybe I haven't been searching for the right thing.how to write code that will control and read data from applications.I know you can do "Process.Start" to open any application, and it looks like there are ways to determine the controls available on an open application, but I can't figure out how to do it. Is this possible? Or do I have to import a .dll file for every program I want to control? Or are both possible?
I have a VB.net application that gets data off our server with ODBC and populates and saves a Word Document. When I try to deploy it to another computer it will get the data just fine and populate the first document, but it will crash before saving it. I've installed the .net framework 4.0, Microsoft Data Access Components, and the Microsoft ODBC .net data Provider. The error code is 0xC0000005, which is from what I can see is called an "Access Violation Exception." It works fine on my computer.
I'm VERY new to VB, and haven't coded since the TRS-80 days. I;m attempting to write code to read several NMEA ports and format the data for archive. When I execute the following on a port with the device turned off, the readline instruction hangs. can someone point me in the right direction to handle this exception.
i have a notification j-query plugin .. i taste it in my page (working 100%)but when i want to use it in a event SqlDataSource1_Deleted with the response.write method it does not work
Protected Sub SqlDataSource1_Deleted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles SqlDataSource1.Deleted Response.Write("<script type='text/javascript'> showNotification({message: 'This is a
how to create a function that parses the input from a textinput.Text into an array of named reading, as string, and returns the number of arrays, or perhaps a negative number if there is an error in the input.
My app currently sends GET httpwberequests and parses the content after reading the response stream for each request and the repeats this process over and over. I need to implement a continuous http stream which uses the same GET request but the connection stays open, from what I understand. how would I change my existing code to do this?
The drive is connected via USB and the problem I'm having is that, periodically, while my code is executing, the usb drive seems to disconnect and reconnect. (Nothing to do with the program, but the drive itself).I want to find a way to prevent these temporary drive reconnects from interrupting my code. IE, i want to insure that whatever read or write that is requested is actually executed even in the case of a temporary drive interruption.
what is wrong with my code and I get no feedback from my button click event, i have imported. ( code Below) and i have tied differrent combinations of the code without sucess.maybe add extra to my code for the list to show open Port or closed ports.
i am asking that can i use c# language to implement "actions" fired on "click side events" such as mouse over the reason for this stupid question is that i remember some syntax of registering functions for particular events of formview, which are call when the event occurs (yes there ispostback involved" is something like the above possible for client side events using c# or even vb.net
I was just writing a windows application that populates three comboboxes from the same datasource. My datasource is a datatable. The way i populate the comboboxes is by repeating the following code for each of the comboboxes:
When the application is run, and I select an item from the dropdown list of, say, cbx1, my choice is reflected in cbx2 and cbx3 as well. I find this behaviour strange and will be grateful if anybody could explain what is going on here behind the scenes. On a side note, I've been able to circumvent this problem by modifying my code as shown below, but would still like to have an explanation for this seemingly strange behaviour.
I'm using System.Net.CookieContainer. I fetch an initial webpage which populates the container. I want to make a copy of this container to use in the future. Is there an easy way to do this in .NET? I'm still new to .NET.
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://www.google.com"); HttpWebResponse resp = null; CookieContainer cc = new CookieContainer(); req.Proxy = null;
The following code populates tab pages with array elements after doing some conditions. [code] Is it possible to have two controls on the With clause? This would allow me to populate not only a tab control with pages, but a combo box with items? Without having to duplicate the above code,
My question is the title how would you write a delegate sub for a list box? (notice the how Im not asking for code but knowlage of how to do it - I looked at this tutorial but it did not really [URL]..
