C# Conversion To VB And Properties - Implement Image Caching For A Web Application
Aug 17, 2010
I am trying to implement image caching for a web application and I found some code on the Internet that implements an HttpHandler that does this. The code was in C# and since my web app is written in VB, I decided to convert the code to VB. I managed to convert everything except the following code (in bold):
public class FileExtensionCollection : ConfigurationElementCollection
{
public override ConfigurationElementCollectionType CollectionType
{
[CODE]...
From what I can understand, the two properties above provide a way to access the FileExtension collection either using an integer or a string index. My problem is that I do not know how to convert this in VB.
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May 14, 2012
I need to implement caching in Asp.net web application My need to store data with different ID's. So which method is better ?
Use a dictionary variable. Insert the data (key as ID and data as value).
Dim mDict As New Dictionary(Of String, String)
mDict .Add(bID, uwtTree.WriteXmlString(True, True))
Cache.Insert("mTree", mDict)
[Code]....
Which method is the best way ? Or is there any other method exists ? I am using .Net 3.5 /IIS 7 (VB.Net).
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Feb 24, 2011
I'm having a http handler that is retrieving images from the file system on the server. I need to cache these images on the client side(browser). For that thing i'm doing the following code
context.Response.Clear()
context.Response.ClearHeaders()
context.Response.ClearContent()
[Code].....
The thing happening with this is ... When i switch between the tabs its taking it from the cache... but when i hit the browsers refresh button its again going to the file system on the server. how to cache these images on the client side.
P.S: Cant do markup caching for all the pages im my application.
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May 28, 2010
I was asked to develop a simple application to handle car inventory. Each car has a LOT of properties (about 130, like license plate number, type, was it serviced, etc.). Some of these properties are represented by bit data type in a database some are varchar.
The problem is that I need to provide search functionality for any of all these properties and any combination of them. This results in a search form with about 130 controls. I certainly do not want to put the SQL query together manually by checking the state of each and every control. To propagate the problem further I need to be able to search for partial strings as well (i.e. if the user enters "porsc" into the car brand field then all Porsches should be found).
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Dec 7, 2010
I am declaring an IList:
Dim OrigVendors as IList
OrigVendors = new List( of IVendors)
I populate the OrigVendors variable and what I want to do is find all the objects that have the ID I am looking for. Then I need to update a property on that object for only the ones found. Is this do able with an IList or do I need to use some other type of collection? I am using VB.net.
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May 2, 2012
I'm having trouble porting some .NET2-era C# to .NET2-era VB.NET. Specifically, I am trying to define an interface that an ASP.NET user control will implement.(For background, I am trying to re-implement Phil Haack's Model-View-Presenter example from several years ago: http://haacked.com/archive/2006/08/09/ASP.NETSupervisingControllerModelViewPresenterFromSchematicToUnitTestsToCode.aspx)
The C# interface I'm working from defines properties and events (IsPostBack, Load) that are already implemented by the base control.However, VB.NET is forcing me to explicitly implement these properties/events in the user control (Public Property IsPostBack() As Boolean Implements IView.IsPostBack...). I'd like to just define these in the interface and not have to do anything special in the code-behind of the implementing user control.I'm assuming that I can do this in VB.NET, I just don't know how. I've spent all sorts of time googling/bing-ing, and haven't come up with the answer.
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Sep 24, 2009
I am trying to select some images that I have in a folder called images in my project however when I select image url in the properties URL the image folder is not found I am only getting App Data and my project with nothing in the folders, I have copied the images to those folders and still nothing.Also I am used to being able to select images for buttons but I am assuming you can not do this in the same way in ASP?
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Dec 29, 2009
any alternatives to progressbar? Inmy project im using progressbar..I would like to change it to something like a rotating gif image which indicates the processing or someother labels which prevents the user from interacting to the program.I tried to implement the gif image by using background worker but its hanging may be coz of huge file transfer process.. So im searching for someother alternative like a label which will prevent the user to interact with the program and shows the progress in % .
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Mar 20, 2011
i need a windows program (on visual basic express) to convert a list of images to black and white. then to send it to a microcontroller via ethernet. i dont know anything about vb at the moment so simple explanations and code would be great. in the meantime i will try learning vb. but i need this program quick.
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Mar 3, 2012
Is there a way I can have my VB application run Flash in my VB window and communicate with like the variables, objects, and other stuff in the Flash movie? Such as if I wanted to get a variable or set a variable in the Flash window.
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Sep 29, 2010
I am Newbie in XMPP . I want to create chat application in VB.net using XMPP .i am having ejabberd serverin my pc.i dont know how to intract with ejabberd server via VB.net.
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May 11, 2009
I want to add Ruler line to my application..how can i achieve this..
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Apr 16, 2009
I am trying to build a class. I am having a difficult time conceptualizing how a class is built and how it works. I want to be able to build a USEFUL class and implement it in an application.
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Aug 16, 2008
How can I implement Ajax in asp.net 2.0 application.
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May 31, 2011
How to implement drag & drop for a WPF application? I could open 2 the same apps and drag an object from one to another. Here's what I want to drag:
<Grid Width="100" Height="50">
<Rectangle BackGround="Red"/>
<TextBlock>Hello World</TextBlock>
</Grid>
The Grid has to look the same in the other app where it is dragged as the one from it was dragged.
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Mar 5, 2011
I'd like to implement DWebBrowserEvents2.DownloadComplete into my Application
My Code
Imports System
Imports System.Text
Imports System.Windows.Forms
[Code].....
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May 12, 2010
I need help to implement multiple threads in application.Assume ds.table(0) has 5 and sometime 6 rows rows for i=0 to ds.tables(0).rows.count-1.I have to apply multiple threads, means all five/six rows should start at once using thead and "Process 1" .."Process 4" should also handled by threads.This is hierarchy that I have to apply with threads, how can I do it. It is requested to put piece of code so I can understand better.
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Apr 5, 2009
how to implement undo/redo in an application? I've searched the web, and most I found don't work properly or just clear the textbox.
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Feb 28, 2010
I have to implement OO scripting in VBS/JS, wondering what's the best way to do that.he scripting engine has to be able to create new methods for existing object in the application and allow calling the methods in other existing objects.
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Feb 4, 2012
I am trying to load an image onto a web form depending on the image's URL path inside a database. I can get this to work, however I am trying to display a dummy image incase the record in the database has no image and the column is NULL.
Below is the code that I imagined would work but I receive an error:
Conversion from type 'DBNull' to type 'String' is not valid.
'// Load Item Image in imgMenuItem Image Control //
If (Not IsDBNull(Rdr("img_url"))) Then
imgMenuItem.ImageUrl = Rdr("img_url")
[Code].....
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Feb 20, 2012
I was wondering how to implement a custom character set for use by an application, i.e. hex bytes that are read by the program then converted and displayed in the window. If this requires first converting the bytes in a file to an already implemented character set, I'm cool with it - I'll go with whatever works or works best. I'm writing with VB.NET 2010, and running Windows 7 Home Premium x64, by the way.
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May 1, 2012
i have one problem to implement finger print scanner using we application.
how it possible,i have digital persona kit
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Jun 2, 2011
I want to learn the Database application programming. Especially, the multi-user environment. User can update the data at the same database. So, could you give me some advices ? Does it should use SQL server db ? How to connect with the the SQL server from other PC user ?
[Code]...
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Mar 20, 2012
I'm wondering if there is any scheduler control in Vb.Net -MS VS 2005- and if not I hope I can find a one - free - that I could use on my application...
how to implement scheduling tasks requirement in my application..
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Jul 8, 2009
So i am converting a metafile (EMF to be exact) to a jpeg or gif (doesn't matter as long as it's compatible with browsers) and when I do the conversion, all of the transparent pixels turn black. I have no idea how to do this in GDI+ but here is the method I am using to save the file:
Dim Img As System.Drawing.Imaging.Metafile = New System.Drawing.Imaging.Metafile(stream)
Img.Save(Server.MapPath("/FileName.gif"), System.Drawing.Imaging.ImageFormat.Gif)
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May 19, 2010
Is it possible to access Application Properties of my applicaiton in run time ? Please refer the below attached image (I want to access the Title and Category properties in my application)
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May 5, 2009
I'm trying to implement cut, copy and paste functionality in my application. My menu is on the main form of my MDI application and I would like to cut copy or paste from any textbox from any mdichild.
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Aug 4, 2010
I have ran into a slight problem and I have not met this issue before today.If I create a Form at run-time with a Button on one Form using a LinearGradientBrushhow can I make the Form maintain the gradient when it is Maximized for every Form that is generated?urrently, if you create 2 Forms using the code below, select the 1st Form created and Maximize it, you will see the problem.This problem does not exst for the currently generated Form however. :-)Would I need to maintain parallel Lists Of Forms or / and LinearGradientBrushes or / and ClientRectangles?
Option Strict On
Imports System.Drawing.Drawing2D
Public Class Form1
[code].....
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Apr 21, 2010
I am looking for ways to implement custom user-roles in windows application with vb.net. I got a database table called Roles with Administrator and User entries. User cannot see some of the form data. In ASP.NET MVC we can do like.
[Authorize(Roles = "Administrator")]
public function GetAccount() as Array
End Function
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Dec 17, 2008
I am upgrading from Visual Studio 2003 to Visual Studio 2008. ow I should upgrade my project.My project is in Visual Basic.Net, and using an Access 2003 Database. I have four datasets, MainDataSet (for the main data tables) LookupDataSet (for lookup tables States, Countries, Colors, etc) OneFormDataSet (data used on only one form) and ReportsDataSet (data used for reports).I have one form "OleDbAdpatForm.vb", that has all the OleDbDataAdpaters for my project. It also has the DataSets and the OleDbConnection.I have public functions that enable me to load the data tables.
I have a LoadTable function when I can pass a column and a value, and the SQL select command is updated with a WHERE or HAVING, so only the requested data is selected. I also can pass the whole "WHERE ..." part of the SQL select command, so I can have multiple parameters in the SELECT command.On my other forms, I have copies of the DataSets, so I can design grids/controls. In the form_Load events, I manually bind the controls to DataSets and tables in located "OleDbAdpatForm.vb", so all forms are using the same data tables, and changes made to data in one form are reflected in data in other forms.The VS 2008's DataSources, BindingSources and TableAdapters seem much easier to use. how I should implement the new data features in my application?
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