Accessing Dataview In New Form?
Jul 31, 2009
I have a form where I open an Access database with 3 tables. I have defined datasets and dataviews for these three tables in the main form. I want to open a new form and access and update the tables using the dataviews I've already defined. When I try to access a record from the dataview using the new form, it's not defined. Can I pass the data between forms or do I need to redefine it in the new form? This is the first time I've tried to use multiple forms.
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Apr 19, 2011
I have a sqlDataSource that runs a stored procedure that returns a table of the days of the month that was passed in as a parameter, arranged as they would in a calendar. It also returns a second table which contains the event details associated with certain days of the month.Basically, how would I go about accessing the values contained in the 2nd table that is returned by my query?I have tried putting the result of the .select in a dataset, unfortunately I get a cast error. If I try to put it in a dataview, I only get the first table.[code]
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Nov 20, 2010
If want to do a DataView.Find on a DataTable that is already 'ORDERED' by the Column I am seaching, so a DataView.SORT should not be necessary, but it throws an Exception if I don't give a .sort command before the .find command. Is there any way to avoid this apparant duplication ? and speed up the search time. Its a very large table - 1 million rows. I am using VB 2010
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Jan 5, 2012
I got a problem with dataview that get data from datatabel (Col1 : ID,Col2: Time) and I'm sorting by Time in desc ... when the values for example {40.21,80.21,70.25,25.2} the dataview sorting them as I need but when one of values goes above 100 for example {40.21,80.21,100.25,25.2} the dataview always sort the highest number is the buttom, I don't know why ..
This is a sample code
Dim dt As New DataTable
dt.Columns.Add("ID")
dt.Columns.Add("Time")
[CODE]...
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Jun 21, 2010
I would like to know how to make a DataView global to a particular form.The DataView is currently created and returned from a function within a public class residing in another .vb module.[code]I would like to make objDataView global so I can use the RowFilter instead of doing a new DataSet every time the user clicks on this RadioButton.
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Aug 11, 2009
I have a program I've been working on for some time now and I'd like to try to streamline it somewhat. I have a main menu form that has a split panel, in the left panel is a treeview that displays forms you can open and when one is selected, it opens in a child window in the right panel. Each time I open form I called DWNForm, it does a series of dataset loads which are the populating items for a series of listviews.
What I would like to do is have these datasets load once during the mainMenu load and then have the DWNForm be able to access the datasets once it is called from the treeview selection.
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Aug 13, 2011
I have an array of variables called VolumeArray(12) which is declared as publlic shared in the main form1.I have a second form2 which allows the user to input various values. When this form2 is closed, I need the data the user has entered to update the values for VolumeArray(12) within Form1.
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Nov 30, 2011
how to access a form in a different project but within the same solution? Say I click a button on one form to display another form which is a part of the same solution but resides in a different project.
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Apr 11, 2011
i created a threaded form class that i call when i know an update is going to take a while....it is a simple form with a label and an animated marquee progress control. the code is listed at the bottom....whenever i try to set the message, it says i cant do it with error "{System.InvalidOperationException: Cross-thread operation not valid: Control 'MessageLabel' accessed from a thread other than the thread it was created on." from my form (in my SAVE function, i put the following line:[code]....
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Jan 19, 2011
how can i access the controls that i made from another form? i'm also going to also use function (on the same form as the controls) that access that controls?
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May 17, 2012
i started using VB 2008 recently (with perl background, its a big leap) and having a problem with database.i am trying to access a database that is attached to a different form. i managed to get my code to work if i was writing on the same form.example of code that will work just fine Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
[Code]...
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Apr 5, 2010
I have two tabs on a form, and I would like to know how can I display the second one when a button is clicked? The name of my tab control is tabSurvey.
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Mar 1, 2010
how can i getting data from listbox in second form named listform while i am at first form..i have search it a lot on google but not find any usefull ans...
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Jan 22, 2009
Private Sub btnsave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsave.Click
'If inc <> -1 Then
[Code]......
i got an error at the time of execution .
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May 12, 2010
I have a button on my form that loads a dialog. I have a logic on here that I want to test, what ever method I try I alway's get 'Object reference not set to an instance of an object'dialog1.vb:
Code:Public mainform As SettingsMainForm If mainform.LogicCheck.Checked Then textbox1.text = true End if
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Jan 31, 2011
I am trying to access a control (statusbar panel) on my MDI parent form from a child form.
Here's my
(located in child form)
Dim frmParent As frmMain
frmParent = DirectCast(Me.MdiParent, frmMain)
[Code]....
Object reference not set to an instance of an object.
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Feb 4, 2010
Accessing Properties Of Form Classes
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Sep 29, 2011
I'm using visual basic 2008. I am done coding the CRUD... but i want it to have confirmation first. Then, i tried using panel, it works. but, my interface looks not organize. Is it possible to access the values in the text boxes from the other form?
For example: the client's information text box are on the form1 and once add button is click, the confirmation box will pop out. and the pop out box is in the form2. Is it possible to access the form1 text boxes from the form2?
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Jul 18, 2009
Basically what I need to do is change a textbox on Form1 (AKA mainwin) from Form2 (AKA loginwin) using data that is inputted into Form2. I've done this before with applications by declaring Form1 in Form2, but this time I just get a NullReferenceException error. Here's the code I'm currently using for Form2. Maybe someone here can tell me why it's not working. [Code] I can't figure out why it's not working. I've used this same method before and it always worked.
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Jun 12, 2012
I have a datagridview on a form and this shows up my list of suppliers. I have a textbox which when i click shows up the supplier list and from there when i double click on a row, the supplier's name is shown in the textbox. The thing is i have to do same on the same page for search purposes which got its own textbox. But the cell double-click event already contains code that will display it in some other textbox like i mentioned previously. What i thought is to make another form with a datagridview. So this datagridview will be used to display the supplier's name in search textbox. But what if i have to access this form several times. Do i have to create several forms everytime?
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Jan 18, 2011
Im quite new to VB.Net so, this is what i have. A simple "console" form. Its just a form with a ListBox in it. To add stuff to the ListBox, i have to open the console, to let other forms know what the ListBox there is.
[Code]...
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Jul 22, 2009
I have created a project, and with form3, created a class for datagridview called MyDtGrd.nd when I created a form4 I used that same MyDtGrd. When I used before to publish the program no problem.But after publishing When I tried to make changes, giving error like"The variable MyDtGrd is either undeclared or was never assigned"Is there any technique to access the same class oject to use in other forms?
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May 23, 2012
I'm trying to iterate through a group of ComboBoxes and set a property using a concatenated string & variable to represent the name of the control. However, I can't get the instance of the form to recognize the (String & Integer_Variable) as one of its controls -- and so it doesn't recognize any of the appropriate properties or subroutines as members of the System.Windows.Forms.Control.Is there a cleaner way to do this?
For myTempCount = 1 To 6
If tempValue < Me.("ComboBox" & myTempCount).Items.Count Then
ComboBox.SelectedIndex = tempValue 'appears to work -- how?[code].....
This code was originally VBA / VB6, which I put through ArtinSoft's Visual Basic Upgrade Companion (VBUC). FWIW, I'm using Microsoft Visual Basic 2010 Express.
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Mar 1, 2011
[Code]...
i have a function that i have in my data access class now i want to access it then declare and assign parameters and then insert data into database.
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May 1, 2010
I have a "windows form" user control--that is, not on a web page etc. This user control has a form within the user control project. However, code from within the user control can't 'see' the form even though it is a public class---I don't understand why this is the case.
So how can I access the controls (a couple of radio buttons) on the form from code within the user control? I tried creating public properties on the form to return the state of the radiobuttons, but this still doesn't work. I get a "Reference to a non-shared member requires an object reference." error
Should I not be able to see the form since it is a public class?
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Jan 30, 2011
When I try to access the controls of a form which is not yet created (i.e. to modify the contents of a text box , to press a button etc) , I fail , usually without even an error message . I found out that the only way to make my program go right is to take care that the form is first created before I try to access anything on that form . However this means I must use the Show method to create it and then to Hide it , which leads to an instant awful optical effect . I remember back in VB6 there wasn't such a problem ; it seems that in VB6 each time I accessed a control on a not-created form led to the form being created silently . Is there any way I could do that in .NET too in order to access my precious controls ?
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Jan 18, 2012
I'm having a strange difficulty. Here is the order of events:User presses button on form1 New Form object is created for from 2 New form object '.show' command is fired Form 2 opens correctly In the Load Event of Form 2, the form attempts to do various things in a try, catch, finally clause On catch, I close form2 down '.close' as it cannot be used as something has gone wrong with the execution However, my problem is this. It is acceptable for things to go wrong on the from 2 load event which is why I have implemented the try - catch functionality. However, when I close the form2 down as a result of the problem, a real error ocurrs 'Cannot access a disposed object' and the VB IDE refers me to Form1's '.show' event for Form2.
It is almost as if the form hasn't fully 'shown' before I am closing it down. Does anyone have any idea what the problem is here? Do I need to close down Form2 ourside of it's Load event handler so that Form1 thinks it has loaded correctly?
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Feb 12, 2011
I have a new solution with 5 projects inside. a data access layer, database, 2 class libraries, and the main form. These are all components that I had worked on to get to this point of combining into 1 solution. Now what I have run into is I can not the actual functions in the class libraries. I can get to the class level, but that is it. ere is a sample line of code I need to get working. Once I get this one line, the rest will be obvious: Temperature is on the main form. get for options is "Equals, GetHashCode, GetType", etc... Before this I had bult, compiled, and referenced these classes separately, and it worked fine. I know this is going to be an easy answer, I'm just not seeing it for some reason.
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Mar 1, 2011
I'm writing a really simple file updater which downloads files off from a website and saves them. The download routine is working well, except that it freezes the project while attempting to connect to the host. Easily solved with threading except now when I try to access other form items such as text boxes, labels, form caption, it says I am not doing it in a safe manner and prompts an interrupt in debug. I did some reading on it and I'm still not sure what to do, I'm very new to vbnet and it is still a little confusing to me.
Error: Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.
Imports System.Threading
Imports System.Net
Imports System.IO
[code]....
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Nov 13, 2009
I'm using Outlook 2000 and I'm trying to access data held on a customised Outlook task form held in a public folder.I'm using the following code to get at what I need, and can see certain values via objTask, but I can't see where I get at other 'fields' used on the form.One of the fields, for example, is called "CC Ref", but I can't find where I can get at it.
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