Define Control Within A Tab Page From A Module?
Dec 1, 2009
i am currently building a MDI application. Both my Add and Edit screen use a form called frmStaffDetails.
On load, this form is redefined as 'AddStaffChild' and 'EditStaffChild' dependant on which menu item is selected. I've defined the CurrentForm as Form.ActiveForm.ActiveMdiChild.
Within a module I am checking the text within certain textboxes. So for example here I am checking a name has been inputted. If it has, then I will allow the record to be saved.
[Code]...
The problem I am having is that this code works perfectly if the textbox control is not within a Tab Control. As soon as I put it in a tab page I get the error.
"Referenced object item has a value of Nothing" Also if I reference it directly for example
If Not AddStaffChildForm.txtFirstName.Text this works fine too, but i want it to be more genric so I can use it for my edit screen as well. How can I define a control within a Tab Control from a module (or any other way to declare a public sub).
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May 25, 2011
below is my code to use binarywriter it work fine on class form1 level
[code]...
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Jul 12, 2011
I was just practicing some coding and noticed that I was able to use class instead of Module in VB .NET. So I replaced my module to class and I got this error message:No accessible 'Main' method with an appropriate signature was found in 'practicevb'.practicevb
I made sure that the startup object was set correctly in Properties > Application > Startup Objects.The error message disappears if I change it back to Module but I would like to keep it class since the other parts of my code I changed to class and didn't return and error messages.
Class Atic
Sub Main()
Console.WriteLine("Hello, this proram will calcaulate the quadratic forumla ax^2 + bx + c")
Dim Quads As New Quads
[code]....
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Jul 11, 2011
My module's Page_Load event is firing twice for each "actual" load. On the initial load both loads' Page.IsPostBack property is false.I've renamed Page_Load to Module_Load to verify the name wasn't an issue. I've made sure the method isn't handling both Me.Load and MyBase.Load, which has been the case in the past.The only thing I'm doing out of the ordinary is that my module is inheriting from an intermediate base class. Could this be the culprit? [code]I had an Image without an ImageUrl. Presumably this is set by my CollapsiblePanelExtender but rendered with a blank src.
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Feb 14, 2012
Currently when i add my control to a form and double click it it adds a sub with the handle control.load to the code but i want it to be control.click when i double click it
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Jan 19, 2010
I have created a User Control (UC) where user type the information it needed and save it ti MS SQL Database and also have created a User Control dedicated for it's button, since my main form has split container and has two panels, one for UC which contain the button only and the other one for my Main UC where user enter the information.I created a Module that contain the function on adding the data type in UC Main to the database.
[Code]...
on My UCButton named "Save" I just call the function AddUserInformation. But the problem is the variable where it bind to the ucUserControlMain textbox remains Blank, When i query the my database table, only the UserInforID and the DateAdded has been updated and the other column remains blank where the variable get it in the UCMain Textbox...
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Mar 8, 2009
I have a form with a Tab Control that has 18 pages. When I click on a tab it opens the page and select a textbox on that page (txtTextbox1. Select() ). This works for the first 8 pages but not for the remaining 10 pages. Although on these pages I can mouse click on the textbox, enter info, save then click my Add button that clears the textboxes and has the code (txtTextbox1. Select() ). The textbox is selected just fine. The code for all my pages is the same except for the tab name and the control names. The tab key will move the selection to the next textbox in order on all pages and the Enter key is coded to do the same. The first 8 pages have a total of 256 labels, buttons, list boxes, textboxes and checkboxes on them.
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Apr 27, 2011
I have a user control that checks if a certain query string and session value are present then returns a boolean based on that, if it's true I want to set the master page. The page is throwing an Object reference exception when it tries to call the method EditUser1.UserAuthorization(). Why is this happening? I imagine that the method doesn't exist at that point in the stack. Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreInit
[Code]...
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Nov 18, 2011
Using vb.net on an aspx code behind event, is there away to tell from a parent page if the child page popup is open, and then close the child page if it is truly open based on some event on the parent page, like clicking a gridview edit link, again?
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Dec 27, 2009
I want to access a page variable from a user control placed on that page. All the solutions work in C# via casting to the page class. The problem is that this doesn't work in VB. The page class is not selectable from the Intellisense dialog. Manual typing results in the error type not defined. It is strange that C# can do this without a problem. What is the proper solution for this in VB? I had other cases where I needed to access a control on the main page. C# again uses a cast to the page class to access the control. This doesn't work in VB again. So how can I access the page class from a user control in generell?
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May 21, 2012
I am using <%@ MasterType virtualpath="~/__.Master" %> to embed my master page content into child page to access control belong to Master Page. I have one DropDownList in Master page. And I want to access its SelectedValue in my Child Page.
Problem is when page first time loads and as I am trying to access DropDownList's Selected Value by writing in child Page - "Master.DropDownList.SelectedValue". I am not able to get DropDownList's Value. Its display's Blank.
But When Page.IsPostBack I am able to get SelectedValue of that DropDownList.
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Jun 3, 2009
I have an ASP.NET 3.5 page with some AJAX, some Validators and some business-rule validation done in the code-behind page (VB.NET).
The Validators set focus to the 'offending' control when an error is detected.
When a business rule is violated, I used the following code to generate some javascript "on the fly" and execute it to simulate the Winforms "MessageBox.Show" functionality:
Sub DisplayMessages()
Dim lblError As New Label
lblError.Text = "<script language='javascript'>" & Environment.NewLine & "window.alert('"
[Code]....
At the end of the "btnSave.Click" code, if everything went ok, calling that subroutine.
What I get is the page scrolling to the top and then back to where it was when the Save button was clicked.
For various reasons, 'MaintainScrollPositionOnPostback="True"' is in the Page directives at the top of the .aspx code. What I'd really like is to make that FALSE for just a moment so that the page resets at the top - again, only if everything is ok and only for this button (there are other buttons on the page that require the page to keep it's scroll position).
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Jun 20, 2012
I recently have convert my project from VB6 to VB.NET2008,after the convert here is a sub that control form from a module that i create,the error was something like
"cmdAdd is not a member of System.Windows.Forms.Form"
Public Sub ButtonSet(ByRef frmObj As System.Windows.Forms.Form)
frmObj.cmdAdd.Visible = True
frmObj.cmdCopy.Visible = True
frmObj.cmdEdit.Visible = True
[Code]...
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Mar 20, 2012
I'm trying to use it in writing VB.NET Windows Form code.So I'm thinking, instead of using a VB.NET module, or having code embedded in the forms, I should create my own "Control" Class, to handle all operations and "application" level variables.Is this the right approach?Ex:
Private Sub frmLogin_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
goControl = New MyControlClass()
goControl.sUserID = txtUser.text[code]....
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Jan 30, 2010
I have a MS Access database set up, with a Period field that has either values 1, 2, 3, 4 or 5. I retrieve these values using a database connection and I would like to reference a particular control based on what period was grabbed from the database.
Here's example code, pseudo of course.
TextBox(dr(3)).Text = dr(0)
dr(3) contains the period, and dr(0) contains the content I would like to put into the text box. I have these text boxes on my form: TextBox1, TextBox2, TextBox3, TextBox4 and TextBox5.So if dr(3) contained 2 then I would want to reference TextBox2.
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Apr 12, 2012
I'm building a apps that which allow to check the room availability for a hostel.I am looking some controls which is similiar to the following which allowed me to change the color of the box during runtime.
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Mar 17, 2010
I have a dynamically created CheckBoxList in a DotNetNuke module I'm building. When DNN creates the page, it prepends the control name with the moduleID and moduleName.
So, when I have "AddLicenseCheckBoxList" on the page, it becomes:
"dnn_ctr949_addRateGroup_AddLicenseCheckBoxList" depending on what the ModuleID and page name is (in this instance it's 949 and addRateGroup respectively). Now, I don't know what the name of the page or moduleID will be when this module is finished, so I need to make sure I am accessing the control my whateer name DNN gives it, and getElementById or getElementByName do not work even when using '<%= %>'.
So what I need to do is use Javascript or some VB to retrieve the checked values of the dynamically created CheckBoxList so that I can run an update on the database with those selected values. [code]...
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May 7, 2012
I simply cannot refer to a control on a form from module code as in all other versions of VB. Here is the code that I mean:[code]The fact that this cannot seemingly be done without getting into looping through an array of controls, assigning the control to a general control variable etc. and much more guff is puzzling and is in my opinion an added complexity to Visual Basic. There must be a simple way to do this - I just want to refer to the value in a control, on a form, from a module.
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Oct 29, 2009
I can't find a media player control or module. I'm using the Express Edition does it even have one?
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Jan 3, 2012
I am trying to access a browser control in one of my forms from a module but keep getting an error. I attached a screen capture showing the code and the error balloon. The subroutine is public, and I am addressing the browser correctly. If I copy that same code into the "Main" form, and it works perfectly.
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Jul 2, 2011
My application has a total of 1 form. I have several modules, one of which is a module that handles a background worker dynamically. But what I need to be able to do is update a textbox from the background worker thread. Again, this code is contained within a module, not directly on the main form, so I am totally clueless as to how to make a reference to it. It's easy in WinForms, but I can't for the life of me figure out how to do it in WPF...
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Mar 7, 2012
I have a single form application with two modules. The first module holds all the Sub procedures that provide the filtering functionality for 3 DataGridViews on the form. The second module holds the Predicate of T functions that actually filter the List(Of T) objects that are bound to the DataGridView controls.
I split them into modules since I was starting to have difficulty organising and finding the procedures and functions if I held them all in the form code.In some cases I can happily both Get and Set form control properties from within the modules. In one case I simply can't, I suspect I may yet find some more instances as I test further. The offending line is in one of the Predicate of T functions:
If tWord.Length <= Investigator.NumericUpDown.Value Then Investigator is the Class name of the form.
I suspect my problem might be that the Predicate of T functions (which are collated in a module) are called from the DoWork procedure of a BackgroundWorker that is a component of the form - hence the DoWork procedure is in the form code, but I'm not certain. The same code worked fine when everything was all in the form code. The error reported when adding a watch to the Value property in the module function is "
'Value' is not declared. It may be inaccessible due to its protection level ". I have tried the following to no avail:
1) Setting the NumerciUpDown modifier to Public
2) Adding a Public ReadOnly Property to the form class that simply returns the Value propety of the NumericUpDown
3) Adding Imports Root Namespace.Investigator to the module
I am considering adding a Public Shared variable to hold the curent value of the NumericUpDown and referencing that from the Predicate of T function.I realise, and have read many times, that accessing form control properties from module functions is generally not seen as a smart thing to be doing, but since I am not trying to chnage anything, I simply want to know what the current value is I decided that I wasn't too worried.
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Mar 14, 2012
Currently I'm working on a Contact Address Book module for DNN 6 and I would like to show a list when a user logs in and some settings to add, delete and change contacts on the Manage section (left upper corner in Edit view).I have no idea how to archieve this, so far, I created two modules. One to display all contacts and other to add, edit, update and delete contacts.How can I add special settings to my dnn module (using vb)?
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Feb 12, 2011
I have an asp.net usercontrol which represents a "popup" dialog. Basically, it's a wrapper for the jQuery UI dialog which can be subclassed to easily make dialogs. As part of this control, I need to inject a div into the page the control is used on, either at the very top or very bottom of the form so that when the popup is instantiated, it's parent is changed to this div. This allows "nested" popups without the child popup being trapped inside the parent popup.
The trouble is, I can't find a safe way to inject this div into the page. A usercontrol doesn't have a preinit event, so I can't do it there, and calling Page.Form.Controls.Add(...) in Init, Load or PreRender causes the standard exception "The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases."
I thought I had found a solution by using. ScriptManager.RegisterClientScriptBlock(Page, Me.GetType, UniqueID + "_Dialog_Div", containerDiv, False) which seemed to work well normally, but recently a coworker tried putting an UpdatePanel inside the dialog and now she's getting the error "The script tag registered for type 'ASP.controls_order_viewzips_ascx' and key 'ctl00$ContentBody$OViewZips_Dialog_Div' has invalid characters outside of the script tags: . Only properly formatted script tags can be registered."
How are you supposed to add controls to the pages control collection from inside a user control?
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Aug 16, 2010
how we can declare a connectionstring in a module and call that module
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Apr 16, 2009
I have a webbrowser control, where I show images (bmp files, that the program creates), and I want to add some UserControls to setup the images (as showing layers, or choosing colors to display). Is easy to do appropiate UserControls on VB.NET, and I know almost nothing about HTML, so, I would like to add standard VB.NET UserControls near the images.
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Apr 27, 2012
I have a VB.Net interface that communicates with an Access 2k3 Database using this module:
Module MOD_ENGINE
'Declare Database connections controls
Dim con As New OleDb.OleDbConnection
Dim dbProvider, dbSource As String
[code]....
I want to call EngineConnect procedure from MOD_ENGINE module into popCboBox module so I can ignate the engine!
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Oct 17, 2011
I have an aspx page that has two different user controls. I want to find user control A and be able to set properties, etc., from user control B.
I was thinking I could do something like this:
Dim CMFilters As Control = Me.Parent.FindControl("CMFilters")
...but that doesnt work to be able to set properties and call methods. I somehow need to get the user control and and declare it as that user control type.
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Jun 12, 2011
I have a text input in textbox1 in tab page 1 and i want that text from textbox1 will be displayed in textbox2 in tab page 2.
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May 26, 2009
How to add existing Tab page to tab control like i am removing Me.tbIncoming.TabPages.Remove(tbPgViewer) 'I removed in button close and after i want to show in form load eventadil
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