VS 2008 SQL Server - Notified When A New Entry Is Added?
May 15, 2010
I have a VB.Net application that connects to a SQL Server database on my web host at GoDaddy. I'm wanting to use it for a chat program so that users can add messages to the database and then everyone else gets the new messages when it re-queries the database.
The only problem is that the only way to get the new messages is to re-query the database every # seconds.
Is there any way to have my program not re-query the database until an entry is added by another user?Would the SQL.SQLNotificationRequest be used for this?
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Mar 22, 2009
I want to be able to add a range and get updated for the entire bulk. I also want to be able to cancel the action before it's done (i.e. collection changing besides the 'changed').
[Code]...
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Jul 29, 2010
Display a Dialog Box that asks for some user input. Take that input and add a new entry to an access datatable. Refresh a List Box that displays the Keys from the datatable. Steps 1 and 2 work just fine. After the following method is executed (without closing the program) I can open the Access Database and the data has been stored to the datatable.[code]...
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Dec 18, 2010
I'm trying to write an application that will notify me when a webpage changes. I used a web browser form and it opens the main website fine. You have to click a submit button to get to the page that I need to track. After this page opens I copy the text I want to track into an input box and then I need to refresh the page every minute or so to see if the text changes.The problem I am having is I cannot get the page to refresh properly. I send the WebBrowser1.Refresh() command but my ap stops responding, but only sometimes. If the refresh works then I get a popup window where I need to send [enter] to get the page to
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Dec 27, 2010
I would like to specify a function to be called in my VB.Net 2005 WinForms project at midnight when the system date changes. Is this possible?I know I could do this by setting a timer by setting the interval to midnight minus the current time, then after the first tick, setting the interval to 24 hours. I was wondering if there was a cleaner, simpler way.
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Mar 2, 2011
I have a class and one of the properties is a list of a custom class. The caller gets the list and is adding instances of class to the list. How do I get notified that the list has been updated?
Private _list as List(of MyType)
Private _totalField1 as Integer
Public Property MyTypeList As List(Of MyType)
Get
Return _list
End Get
Set(ByVal value As List(Of MyType))
_list= value
_totalField1 = _list.Sum(Function(x) x.Field1)
End Set
End Property
What I'm trying to do is every time a MyType object is added to the list keep a running total of Field1, but adding to the list doesn't use the setter. How can I know when the list has been added or changed?
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Aug 10, 2010
I'm creating an application that notifies users if a new row has been added to a table in the applications database. Would it be best to create a trigger for this or just check every few seconds directly from the application?
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Oct 3, 2011
Access <asp:table> table rows added by javascript in asp.net webform . Apologies for the duplicate question but I'd really like an explanation why this is the case. It is probably due to my lack of understanding on how browsers process HTML tables on submission to the server.If I have a <HTML> table or an <asp:table> control on an aspx page and I add rows to it client-side using JQuery / Javascript, why can I not include these added rows in a post-back to the server?
I've been trying to get this to work and it looks like I can't do it based on the answer to the previous question. But can someone explain why this is the case? The table itself can be returned in the post-back but the only rows present are the rows that were part of the table when it was sent to the browser originally - it does not include the rows added by the browser.there was a way to include these new rows in the post-back, the same as any client-side user input?
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Sep 8, 2009
i am pulling together a cash register that will allow both bar code product entry and manual key entry.imagine if you have a tin of beans in front of you, in a small corner shop they would probably type "47" and then hit "Produce". Fairly straight forward as I have the button Produce to act upon my code and update my salestrans.mdb but,if you scan the bar code I want the same form to handle both 'real' actions, (i assume that keyboard emulation barcode scanner includes "ENTER" after providing 13 digits)....
Q. in perhaps a long winded way i want to know how to kick off an event based on the "ENTER" key being activiated by the barcode scanner)?i do not want to have to hit any buttons if i am scanning bar codes.
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Jun 14, 2009
I am just added new project class library to make dll file. when i write the first line i got this problem
Dim objStreamReader
As
New
StreamReader(Server.MapPath("TextFile.txt"))
name 'server' is not declared
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Nov 4, 2011
What is the code for ignoring the case of an entry while checking to see if the entry is correct or not... (i.e. in a flashcard program... given definition, asks for the name) I don't want the case of a character to affect whether the answer is correct or not.
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Jul 10, 2009
I am trying to make a program with a bar code reader for the first time. I am programming with VB 2005. I want to differentiate a bar code entry to keyboard entry. My questions:
1. Does bar code reader generate a keydown (or keypress) event for each of the digits of the entry? For example, if the barcode read: 1234567890, does that mean that there will be 10 keydown (or keypress) events for that single barcode that was read?
2. I have read from the posts that the best way to differentiating keyboard vs bar code input is to analyse the time between keystroke (for less than certain number of milliseconds).
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Mar 5, 2012
if could modify the following code for me so that it save data row by row from a DataGridView into SQl Server. Currently, the code saves data from all rows at time instead of saving only the recently added data in a row or rows when the user clicks a button.[code]...
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Jul 11, 2009
I am trying to make a program with a bar code reader for the first time. I want to differentiate a bar code entry to keyboard entry. My questions: 1. Does bar code reader generate a keydown (or keypress) event for each of the digits of the entry? For example, if the barcode read: 1234567890, does that mean that there will be 10 keydown (or keypress) events for that single barcode that was read?
2. I have read from the posts that the best way to differentiating keyboard vs bar code input is to analyse the time between keystroke (for less than certain number of milliseconds).
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Jun 21, 2010
I have a program that adds controls on the fly to an auto-scroll panel. When the panel is scrolled (viewing the bottom of the panel for example) and a control is added, it looks like it is added assuming the top left corner of the panel is still at 0,0 when in fact it may be 0,500. To see what I am talking about, create an empty "Windows Forms Application" project and insert the below code into it.
Friend WithEvents Panel1 As System.Windows.Forms.Panel
Friend WithEvents btnAdd As System.Windows.Forms.Button
Dim ButtonCount As Integer
[code]......
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Jun 10, 2009
i have multiple forms in a project and all have statusbar. there is no way to add textbox on status bar but in my previous thread i got the help to add the text box. i created a function in module so that i call that function from all the forms on load and add the textbox on status bar and also add the event on textchange. the function to be called on event change is in individual form (at present)[code]
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Aug 18, 2010
I am creating a very simple Voting System, that will be use on electing new set of officer in a teacher cooperative...
So I have to create two separate program, a Server Program that will manage all the information in the election and a Client Program where voters will vote their selected candidate...
The election officers wanted that the Server Program will display the Voting Results at real time... So when the Voter finished voting, The Voting Result displayed by the Server Program will also be updated every time the Client Program Insert the data to Database....
An action listener in Server Program that will execute if new data is inserted in a Table in the Database made by the Client Program...
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Oct 16, 2009
All I want to do is to stop my application at a certain point, wait until a certain key is pressed - say for example the space bar, then continue execution. How simple is that! Any other normal programming language, this would take me a few secs - but not VB2008
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Mar 21, 2010
I'm trying to set up Name entry in a text box, and I don't know how to make it so it is Letters only, not alphanumeric. (spaces too) How do I set up a date label for the form using the current date? On a try statement, I'm attempting to set up two different Quantity exceptions, one for radio buttons and one for quantity in a text box, is this possible or do I have to break it up into 2 statements? Or do i have to set up a numeric if statement like I'm trying to do with the name entry.
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Dec 7, 2010
basically, i have a database full of records and i want my list box to be able to display all the data from one column in one table in it. i can do this, but only when i enter the same amount of items into the listbox's "items collection" as the number of records in the database. other wise with my code alone, i get this error message:
Incorrect coding?:
ListBox1.Items(inc) = ds.Tables("TTDB").Rows(inc).Item("ChildName") -
Error Message:
InvalidArgument=Value of '0' is not valid for 'index'. Parameter name: index
[code]....
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Jan 17, 2010
How can I Tell Visual Basic or Studio to alter the entry point other that its default one(The first Form)[url]....
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Dec 29, 2011
Im trying to build a user control to enter date as dd/mm/yyyy. I want to create a text box control so the user can enter the date without making a mistake.ex:-Lets assume that the user is trying to enter 31/03/2010 so when the user types 3 first the next number allowed should only be 1 or 0 because there cant be any date more than 31.and if the user enters 31/ then he should only be allowed to enter a month which has 31 days. Im trying to implement this codes in keypress method.So it checks the errors at runtime and prevents the user from typing a wrong value.So far i have got to something like this but Im stuck.Please help
Dim IndexOfCursor As Integer
IndexOfCursor = textbox1.SelectionStart
chr = e.KeyChar
[code]....
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Dec 16, 2010
I've been coding a Windows applicaton for the past seven months but there aren't a lot of "windows" in the application so I have a question on getting and returning data from forms. I display a form and the user makes a listbox selection then presses Ok. Normally I can proceed from there (in a class module) with values from the config file, but sometimes his selection will require me to ask for more information. So I want the class to display a form, pass control to it, then when the user hits OK on this form, return to the class. What is happening is the class continues with all its inline code and function calls and doesn't show the form until the end of its current function.
Dim flClientInputFile As New CFile
Dim flPreparedOutputFile As New CFile
Dim lRecordCount As Long
Dim sProcessing As String
Dim sTest As String
Dim frmAbc As New frmAbc
frmAbc.Show()
frmAbc.Activate()
x()
When I run and step through this code, I find I'm in x() before I even saw the form. x() needs the data the user has entered on frmAbc in order to continue.
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Oct 23, 2010
I'm creating a project with an Add-on system, and I'm releasing an API so people can develop for my application (its called Levanta, its a basic Sub-OS, and i want people to be able to develop for it). I try to call a sample DLL i made to test out the system i created. Well, i CANT, because its not finding the functions entry point of the said function (its named initialize)...?
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Aug 30, 2009
Seeing how Notepad++ does this, is it possible to achieve something like this:using Registry class?
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Feb 10, 2009
I'm successfully refreshing my DataGridView/Access DB by using the following.[cod]My only problem is after the refreshes the DGV rolls back to the first entry.Is there anyway to have it refresh but stay on the same line?
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May 11, 2010
how to reference/add mshtml.dll to project as described on this url. It explains how to reference SHDocVw.dll but not mshtml.dll. I can't see it in the list and when I browse to the file on windowssystem32 an error pops saying I can't add it to the project.
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Aug 26, 2010
Public LabelX As Integer = 12
Public LabelY As Integer = 9
Private Sub AddLabel(ByVal LabelName As String)
[code]...
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Aug 31, 2009
I am developing a program and stuck up with an issue. I am able to enter single value in MSAccess database however, when I create a programe to enter multiple entries I am getting an error. developing a code to enter multiple entries in MSAccess 2002 db with the help of VB based form?
I Following code I am using for single entry:
Private Sub Button1_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Enter
Dim query As String
[code]....
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May 3, 2011
I have an application that has 3 list boxes, one selects a workshop, the other a location. the third is to display selected costs.to do the calculation a loop is required. i have written the code but when i calculate the cost the final result to be displayed ends up as being the cost of the last work shop and location * 3,What is supposed to happen is the location is multiplied by the number of days(3 in this case) and added to the workshop cost.the loop is supposed to add all cost from the list box till all have been added.what is happening is the calculation goes to the last entry as stated the multiplys this total by number of days(dbl)?
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