Navigating Around Classes Properly?
May 19, 2011
It has come to my attention even as a novice programmer, that there comes a time when you need to step it up a notch and take my programming to another level. For me I think that time has finally come in trying to learn how to use classes properly.
I suspect this is a common rookie fear and the leap to move out of the Form1 Class, or off Form1 is a daunting one. I learned how to add new forms many years ago and to get them to interact with one another in a crude manor, but never really mastered the whole concept of classes.
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Jul 9, 2010
I have a basic three form application. It doesn't seem to close after navigating through forms. If I were to open the application, and the main form is displayed. If I press the X button, the application closes fine(Goes from processes) If I were to open the application, and then navigate from the main form to another form using me.hide & form1.show, and press the red X on Form1, the application again, closes fine.
[Code]...
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Jun 22, 2010
I am looking for a code snippet which opens a image, creates a clone of this bitmap in memory disposes this opened image so that all handles are closed.
Usually we can open a bitmap using this[code...]
the following code however keeps the Image File locked until the application is running, any suggestions how to dispose it properly. (So that no handle is left open )
Things i already tried: use dispose method of bitmap <= doesnt work (need to write implementation)
Using Block also doesnt work.
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Jan 23, 2012
I have two classes, one nested in the other. [code]Neither "Name" or "ID" are unique between operations and records.I wish to construct a dictionary using LINQ = Dictionary(Of String, Of List(Of Integer), whereby the keys are uniqe examples of Names in my collection and the values are the collective set of distinct IDs that are associated with those names.
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Jun 13, 2012
How can I structure my classes so that the user interfaces though a single class while the supporting classes are hidden from their view? I think its best understood in an example:
Public Class MyInterface
Public Economic as EconomicClass
Public Sub New()
MyBase.New()
[code].....
So you might ask why am I even separating them? It's strictly for others who will be working with this interface. I need to funnel them though a logical structure:
interface.Economic.MyMethod
interface.Currency.MyMethod
etc
This way everything is already handled for them in the background and they only need to run the method they need. I don't know if I can have it both ways in VB.NET.
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Oct 24, 2009
Here is some example code of what I mean:
vb
Public Class Form1
Private Sub Button1_Click(ByVal sender as Object, e as systemEventArgs) Handles Button1.Click
[Code]....
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Jul 10, 2009
I m trying to raise Click event of Textbox explictly but I m getting "Derived classes cannot raise base classes" error.[code]....
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Apr 18, 2011
Another area i am now stuggling with is navigating through records one at a time using a database. I am making a quiz and I want the form to populate one row at a time. When Next button is pressed/called, I want to the next row to populate the form, so on and so forth.Problem is I don't really know how to do that.
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Aug 23, 2010
I am using Windows Forms on VB 2008 Exp. combining with Access 2007 as backend.I have designed a form to use ADODB connection with recordsets to retrieve and display data on label controls on the form.On the Form I have buttons like (First, Previous, Next, Last).... I want to use these buttons to navigate the rows of the recordset.However, I have problem in the codes - when I click the PREVIOUS button, it will tell me that either EOF is true. But if I click the NEXT button, it moves to the next record once.... Clicking on NEXT again, does not move to the next record..
See my code below:
Imports ADODB
Imports Microsoft.SqlServer.Server
Imports System.Data.Odbc.OdbcConnection
Imports System.Data.OleDb.OleDbConnection
[code].....
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Nov 18, 2008
What is the best place (event/procedure) to use the newest record when navigating from record to record on a form.
For example, I want to do a calculation on 2 text boxes that are bound to a dataset. This calculation will be done each time a new record is navigated to.
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Feb 15, 2010
I am using
VB
webbrowser.navigate(link)
in a timer and that sometime ended up with error and sometime the browser shows a blank screen and keep on refreshing and other times it shows an error and the application stop responding.
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Apr 24, 2012
i am having trouble navigating between forms in VB 2010. the code is as follows -
[Code]....
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May 11, 2009
currently i get data from 2 different tables.....and i need to navigating them into sum textboxes....which mean i need to 2 functions to do so rite?ok i categorized them into 2 parts.....i can get part 1 data correct into textboxes but then part 2 did not show any result and dun hav any error too. ....here is my code.
CustId = TextBox1.Text
For c1 = 0 To (MaxRows - 1)
If CStr(ds2.Tables("test1").Rows(c1)(2)) = CustId Then
[code].....
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Feb 20, 2009
I am developing an intranet site using VB.net 2005. I have a list of reports and their URL's located in a table. The list is displayed to the user using a Gridview control with select turned on. when the user selects one , the selected index changed event triggers looking up the URL from the table and stores it in a session variable. the problem i have is that i now need to open a new web browser window and display the page.
I tried using the envDTE.ItemOperations.Navigate but all of the information provided for this process is written in VB6 and VB2003. In 2005 the DTE proces is not native and when you assigned the ENVDTE.Itemoperatiosn to a shared variable (or any type) and
then try to navigate you get the following error: Object reference not set to an instance of an object.
so i tried to create an instance but when i try:
ItemOp = DTE.ItemOperations or
ItemOp = EnvDTE.ItemOperations
it gives me an error indicating that this is not possible. My quesion is, does anyone have the correct syntax for using the envDTE.ItemOperations.Navigate instruction from Visual Basic.Net 2005? None of the microsoft pages or microsoft books provide correct syntax. Or does anyone have any substitute code that can navigate a user from a protected sub in one page to a new web page?
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Jun 16, 2011
How will I navigate the buttons using the arrows keys? Example, from button Broccoli, I want to go to button Portobello Mushroom, i will just press arrow down. But it is not working. For me to reach button Portobello Mushroom, I have press the arrow right 6 times. How can I use the arrow down?
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May 30, 2009
I have multiple forms and I want to be able to navigate through each of them using buttons. "Next" and "Back" buttons would be used to navigate through the forms.I know that NickThissen has made a Wizard Control to do this, but I want to learn how to do something like this, but a bit more basic.
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Mar 25, 2010
How to block sites with my own webbrowser in vb2008
so when i navigate to a blocked site it wont be opened...
not things like : c:windowssystem32etchost
but when blocked site start navigating webbrowser1.allownavigation = false , or webbrowser1.documenttext = "<font size=7><font color=red>This site isn't allowed</font>
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Feb 24, 2011
I'm trying to load a specific game (Kingdoms at war, www.kingdomsatwar.com) into a web browser on my visual basic 2010 project (i dont mind if its a webbrowser, AxWebbrowser or Axshockwaveflash, it just needs to be in my form).
To answer this question you may need to go the extra mile and join the game to try what im asking Ok so details:
I have a few issues when trying this, I create a form with a standard web browser and change the url to www.kingdomsatwar.com , when it runs it will go to the website however when clicking the login button it will go to a black screen with a bit of writing cut off in the top left corner (which i found out was "Page Loaded"), so thats the first issue.
However this can be temporarily fixed by right clicking and going to "forward" or "play". After this you will go to a login screen where you can enter your details, however after this it will load the game with a "cannot connect security" (which may be a game issue, however i need to know how to make the vbwebbrowser work like internet explorer, which will load it).
This game runs in flash, so i need to know if there is any special way to make the vbwebbrowser work properly like the internet explorer version works with the game.
I tried running the game's url itself (using mochigames), which is http:games.mochiad.../play.swf?q=243 , (i have tried this in the vbwebrowser, axwebbrowser and axshockaveflash) and they all won't load the game (they will load the game when not logged in but wont load an account)
I know this is a very specific question and can probably not be solved but if anyone has some spare time, could they create an account and give it a shot. All i need is a form which will load a www.kingdomsatwar.com account on it.
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May 10, 2012
I'm automating a download,and I know the URL to the download page. Well, not exactly. This URL is indeed what I need to use, but the website redirects it to the REAL download page. Unfortunately the redirect only happens if I do an exit sub. That is to say, if I do a loop sleeping one second per iteration, the loop goes on forever waiting for the redirect. But if I branch out of the loop by inserting an Exit Sub in break mode, I can see the redirect occur onscreen. (I can watch the current page in the web browser transition to the desired download page). The trouble of course is that I don't WANT to do an Exit Sub at that point, so what's the solution? Do I need to call Browser.Navigate on a background thread?
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Apr 10, 2010
On the main form of my application, I added a menu strip button to it to open another form rcgntn.vb in my application.[code]...
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Dec 12, 2011
I am sure this is not a unique problem, but I am drawing a blank (Monday morning) on how to fix it.On my Nav menu, user opens a page with a DDL, selects a record from drop down which opens up a single line in a Gridview with a few fields displayed. User can click Edit and Update two fields or of course Cancel, or select another record from the drop down which displays the new record in the Gridview.All this works fine.Issue is when the user goes to Nav menu and goes to another page then comes back to the first page, the last record that was being viewed is still displayed in the Gridview instead of showing only the DDL and waiting for a selection. Its as if the Page Load event does not fire again (In fact it does not). I need it to fire as an initial load, in order for the 'If Not ISPostback Then' logic to properly fire.
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Jun 9, 2011
Is it possible to navigate multiple tables at a time.... The two tables are joined with primary and foreign key relationship...
some site to which i can refer or some sample code for all first,next,previous,last
I can do it when its single table....
Private Sub btnFirst_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFirst.Click
' con.Open()
[Code]......
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Mar 22, 2011
I want to make my webbrowser navigate to the clicked toolstrip item's text. for example:
Private Sub HistoryToolStripMenuItem_DropDownItemClicked(ByVal sender As Object, ByVal e As System.Windows.Forms.ToolStripItemClickedEventArgs) Handles HistoryToolStripMenuItem.DropDownItemClicked
[Code]......
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Sep 2, 2011
I am working with vb.net to making a form that prevents the web broswer on windows internet explorer from navigating to certian pages. The code can't just work on internet explorer because I could make a program with a web browser that navigates. It has to prevent the web browser itself from navigating.
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Jul 29, 2011
I am currently building a webbrowser that only loads one page, but I don't want the user to be able to navigate away by clicking advertisement links, as I don't want them to be able to surf the net, clicking links could eventually lead them back to Google to search for what they like if they are clever enough!
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Dec 26, 2009
how can i navigate the datatable with the help of a BindingSource?
here lies the
con = New OleDbConnection("Provider=Microsoft.Jet.Oledb.4.0;Data Source=db1.mdb")
con.Open()
cmd = New OleDbCommand("Select * from Table1", con)
[Code].....
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Jul 3, 2009
I have this code to attach a new navigating event to a custom webbrowser control. Here it is:[code..]
I do not know what is happening here, as I have used this code on previous projects before.
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Feb 23, 2009
I'll start off by saying my website has a landing page of http:[url]....
On PageOne.aspx, I have a link to another page: http:[url].....
On PageTwo.aspx, I have an link to the following:
<a href="http:[url].....
The /MyFiles/ directory is actually a virtual directory which points to a file server that holds many other files (PDF, jpeg, doc, etc.).When I navigate to PageTwo.aspx from PageOne.aspx, I can click "back" and still get to PageOne.aspx (my browser history is ok). When I click on the link on PageTwo.aspx, the PDF opens in the same window...then I can click "back" to get back to PageTwo.aspx, but I can't click "back" again to get to PageOne.aspx (it seems like my browser history has been reduced by one page).
I can only imagine that this happens because of the virtual directory since I can't duplicate this problem if the PDF resides on the same server as my .aspx pages. If that is the case, does anyone know how to get around this and still have my PDF reside on the file server (virtual directory)?
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Jan 11, 2010
We are using the DataGridView Control for our projects. The Applications we are developing is the replacement for the Existing CLI (Command Line Interface Applications) written using FoxPro.The users are much more familiar with the Keyboard Navigations ratherthan using Mouse and all.Here What we need is, how can we handle the Keyboard Operations in the Data Grid View. Some of the Operations i am listing below.When we hit Enter Key :
1. Navigating the Cursor into a particular Cell (It will be in the Same Row, but Different Order), after getting focus the cell should become editable
2. Navigating the Cursor to the Next Row and First Column (Once i finished the editing in the Last Column )
3. Focusing the Cursor into a Specifc Row and a column. (With Editable)
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Sep 27, 2010
When i load my database i load it into a DataSet.When i search the database i load the results in to a DataTable.I want to find what index a search result has in the DataSet.When navigating the dataset i can use this code to get the index ds.Tables"Filmer").Rows.IndexOf(ds.Tables ("Filmer"). Rows(inc))But i can't make i get the dataset index of a search result from the DataTable.I thought that i could use the same code when navigating the DataTable, but it only returns.
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