Pass DataTable Event To Class?
Apr 17, 2012
I have a form that contains a DataTable variable (dt) that has a RowChanged event assigned to it. I use a UserControl (DataGridViewFilterAndSorter) to get a subset DataTable from dt. I need dtSubset to have the same event as dt. How can I do this?
In other words, I need to pass the dt event to the DataGridViewFilterAndSorter class and store that event as a class level variable. How can I do this?
Public Class frmCalculatedResults
Private dfs As DataGridViewFilterAndSorter
Private WithEvents dt As DataTable
[Code].....
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Sep 29, 2011
I have procedure (Import) that calls a for a new instance of frmImportData. I also have a class name clsBatch that has a data table property called prpParametersTable.For some reason, I get an error (indicated below with ERROR>>>) when trying to assign prpParameterTable to cv_dtImport2. The error states "Object reference not set to an instance of an object.". Why does this error not happen when I assign dtBP to cv_dtImport1? Both cv_dtImport1 and cv_dtImport2 are equal to Nothing and in my Import procedure dtBP = prpParametersTable.
Public Sub Import(ByVal clsB As clsBatch)
Try
Me.cv_clsB = clsB
[code]....
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Apr 26, 2012
I have a winforms application connected to Mysql using the.Net driver. I written a class to handle to all the database functionality. I use a dataTable to store query results for binding from mysql.
Imports MySql.Data.MySqlClient
Imports System.IO
Public Class MysqlConSjC[code]......
This method does a select query. How would I write a method to insert/update/delete rows of the DataTable in the database?
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Aug 9, 2010
Is it possible to pass adodb.recordset from VB6 to datatable? Just thinkin', I have created a dll from VB6 that is returning a record, in the future I want my .net apps to call from it. Or I have to build a new one from .NET?
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Dec 27, 2010
Is it possible to raise event in one class and handle the event in another class? If so, how?
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Jul 29, 2011
how to Pass datatable as a parameter to a SQL Server stored procedure
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Nov 18, 2010
I have a class that is stored after serialization and compression.Is there any event built in the class that is fired automatically when a class is deserialized and ready to be used??
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Apr 14, 2009
I have a "partial" class in VB.NET. Half of it is auto generated by a code generation tool. That half implements INotifyPropertyChanged, so any properties in that part of the partial class raise the PropertyChanged event.In my "custom" part of the class, I declare another property that depends on one of the properties in the auto-generated side. Therefore, when that auto-generated property changes, I also want to raise a PropertyChanged event on my custom property that depends on it.
If I go into the generated part of the class and raise the event there, that will get overwritten if I ever re-generate that part, so I don't want to do that. I would rather add an event handler in my side of the partial class that checks if the generated property changed, and if so, raise another event for my custom property.
[Code]...
I'm assuming it's because normally you'd use the WithEvents keyword to tell the compiler that you're subscribing to events from that object. I don't have a clue how to do this inside of the class that's actually raising the event, or if that's even possible.
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Nov 3, 2009
The value from the text box is not being passed to the class.[code]...
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Feb 16, 2011
Can any one please tell me why the following code is not giving me the expected result Application type as Class library Form with 1 text box and 2 button
form1.vb
Public Class Form1
Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cl As New WindowApp.Class1
[Code]...
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Nov 9, 2010
The reason why I need to do this is because I have a sequence of two lines of code that is littered all over my program, where I dynamically remove the handler to an event, then set the handler again. I'm doing this for several different events and event handlers, so I've decided to write a function that does this. [code]...
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Jul 4, 2010
I want to invoke another control on the from when i click on one control.
Eg. When i click on btnOpen , i want btnClose to be activated
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Mar 6, 2009
I have been reading the following thread by perito which was resolved with a great deal of assistance from Athiest.[url]...
Using the sample code in this thread I have now created a Client and Server app which is successfully sending messages over a network between two machines.
Now that I am able to send simple text messages I would like to progress to my intended pratice of sending more complex information between the machines. I have already written a program which generates and stores data with a class which I use as a data type. I would like to be able to pass this class from one machine to another.
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Oct 19, 2011
I have a class, LogRequest, which contains parameters (members) for an object.This object is turned to an sql query using another class, DataAccess.And lastly, I have the class Search which run the sql query.[code]...
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Apr 7, 2011
I'm still trying to develop p2p chat application from this thread. I have 2 applications, server and client. A client has: Form1.vb, BB_Client.vb, and RTS_SocketClient.vb. Dataflow is Form1 creates new object of BB_Client, BB_Client calls RTS_SocketClient.[code]...
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Jul 25, 2011
I have a main class named PortaLinhaFrio and a child class named Ambiente [code]...
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Jun 13, 2011
i struggling to pass two parameter to an event handler basically when the page is load it dynamically create some control lable, textfield, and linkbutton when i click on the link button it fire an event handler, here is my problem i want to pass first the Product ID and quantity, the product id is fetch from the database passit thorugh an object where as the quantity it enter by the user first part of the code it connect to database loop through and display all record on the page dynamcally
[Code]....
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Nov 1, 2008
I have a function that creates a button and textbox on my form dynamically. That all works fine, but now I need to pass values to my click event.[code]...
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Nov 11, 2010
What is the best way to pass a variable from an OnClick event. To elaborate I would like to bind some data to the button and then when that button is pressed I would like to pass that data back to the code behind and do something cool with it.[code]...
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Jun 25, 2011
i have a class called car and within that class i have a few vairables
Public Class car
Public Property Name As String
Public Property ID As Byte
[Code].....
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Dec 11, 2010
Okay so what im trying to do is make a simple particle system in VB (Yes i know this isnt a ideal setup). Im going to have particles dieing and spawning new ones tho, To do this i need to be able to pass a function to the particle when its created then call that function when it dies. Is there a way to do this by passing function pointers?
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Jun 18, 2009
I create a object type entity in the main function and would like to pass it to a separate class, do some calculation, and then pass the result back to the main function. But I keep getting errors, can someone point me where I did wrong? It's in windows application[code]...
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Sep 12, 2011
How can i use a js variable in mouseOver event?Here is my code:
<script type="text/javascript">
window.String1 = <%=GetLocalResourceStringEscaped("String1")%>;
window.String2 = <%=GetLocalResourceStringEscaped("String2")%>;
[code].....
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Jan 13, 2011
I have an application that reads another processes memory.I initially had multiple scanning threads for the various areas I needed to read.This was processor intensive so I decided to go with the observer pattern.All was well except that I am having a weird behavior.Here is what is happening.I have 2 radars (overlay and mapped)Both have a watcher class that attaches to the memory scanner and is notified on a new list of mobs.so I open radar 1 (mapped) it attaches it's watcher to the scanner and waits for mob list update notifications
Open radar 2 (overlay). same thing happens and another watcher is attached.all is well and good so far.Now there are properies on the mobs in the list, one of which is IsFilteredOut.This property is set in the radar code after it receives the list. Now the weird behavior is that no matter what I do, the second radar to be opened changes all the properties of the mobs in the list of both radars.It is as if I am passing the list by ref, but I am not.I actually create a new instance of the moblist class every time I pass the list.Here is the notify code. As you can see I create a new instance of the moblist class each pass.
Private Sub NotifyMobListUpdated(ByVal Mobs As List(Of MobData))
If Mobs IsNot Nothing Then
For Each w As Watcher In _watchers[code].....
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May 5, 2011
I am having a hard time trying to pass the values from a list inside of a class. I am trying to display multiple lines of values from a list inside of a class. My "client" class stores multiple lines of values into a list(of class transaction), with the number value (num) counting each transaction that it adds to the list.
Ex:
Public Class Client
Private m_tranlist As New List(Of transaction)
If CInt(tid) = m_ID Then 'create client tran, add to list
nextTran = New transaction(m_ID, tcode, tdate, ttype, tshares, tprice, value, num)
m_tranlist.Add(nextTran)
num += 1
End If
Now I am trying to display each line that is stored in the list in a label, and I am having major trouble. How do I call the list in my main form in order to display all of the values?
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Apr 23, 2009
Is there a way to pass code blocks to a method or class?
I'm trying to write a number of exception handling methods.[cod]e...
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Dec 11, 2011
I am using an email verification program I have downloaded to test the validity of a given email address.I have setup a class in VB using Visual Studio 2010 with the required code that runs the check.I have then registered this as a COM so I can call it through VBA in Excel.In an excel workbook I have then created a module that calls the VB class. The excel module tests whether the email address typed in cell "A1" is valid or not. At the moment the VB class simply gives me a messagebox output saying "Success" or "Fail" which works fine.What I actually want though is for the "success" or "Fail" message to appear in cell "A2" next to the email address as opposed to the current messagebox output.
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Aug 7, 2009
I'm trying to take a resultset, store in a class then retrieve the complete record for a given value. For example, the recordset has AnalystID (Unique), LastName, FirstName. I want to be able to pass the AnalystID and return the name. I need the ability to look up either last or firstname by analystID throughout the program. Here's what I have so far. I'm not sure I'm even headed in the right direction.
[Code]...
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May 3, 2012
I'm writting a class that needs the form handle but there is a way to use it without send it as argument in the class constructor or in a property?I know that the handler is not set until the form is completely loaded so that is another problem too.The basic idea is catch the form handle without pass it as argument and handle the wm messages.
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Feb 11, 2012
Implementing a simple MVC in vb. The controller instance creates and holds instances of the model and view:
Public Class Controller
Public Property myModel As Model
Public Property myView As View
[code].....
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