Asp.net - Reducing The ViewState Size On A Legacy System?
Jan 21, 2012
I've looked up ways to reduce the ViewState:
Viewstate Optimisations
Strategies for reducing ViewState size in asp.net
However, due to the situation I'm in, I need the quickest and most effective ways to reduce the ViewState size. The legacy system I'm working on is bloated and routinely has a ViewState that's 800Kb+ on multiple postbacks.
For example, I'm pretty sure populating drop down lists with 100+ items on multiple post backs is one of the culprits, correct?
Disabling the ViewStae entirely doesn't appear feasible. It breaks all of the controls, of which there are many, rendering the pages unusable. If this is the best approach, how should I go about handling all the broken controls?
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Jun 28, 2011
I noticed that when using a single letter as the title on a tab of a Tab Control , the tab is bigger that it should . Look on this example :
The above Tab Control behaves normally because the text on each tab is sufficient to keep it big enough . The lower Tab Control , however , has its tabs too big . Is it possible to reduce its width ? I saw there is an ItemSize property of the Tab Controls , but unfortunately I can only modify the height of the tabs . No matter what value I set for its width , the width remains always the same (and larger than it should) ...
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Oct 15, 2009
I have an application which I've developed which queries Active Directory information and stores about 15 properties into a Datatable which is kept in memory. I need to decrease the amount of "Commit" memory it is setting aside. The application stays active in the system tray and allows for quick searching of information along with pictures for users. I have a class, which is able keep memory usage down pretty low. It runs on a timer every 10 seconds and listed below:
[Code]...
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Mar 19, 2012
Is there an easy way to edit the code below so that it copes (works the same) if the embedded resource is not a plain text file, but a compressed text file?
Dim tempList() As String
tempList = My.Resources.ENABLE.Split({Environment.NewLine}, StringSplitOptions.None)
For Each strWord In tempList
enableFullList.Add(New Words(strWord))
Next
I have seen System.IO.Compression but can't work out what to do, DeflateStream, GZipStream etc.
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Nov 29, 2010
Im trying to enlarge a circle on a form using a scrollbar.I have managed to do this using the following [code]Thing is the code draws a circle on every scroll movement. You end up with a mass of circles. I want it to clear previous graphic and just show the circle that relates to the current scrollbar graphic, giving the impression of enlarging and shrinking.
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Sep 15, 2009
I have written methods to override the LoadPageStateFromPersistenceMedium and SavePageStateToPersistenceMedium methods. now the problem is that i am using a masterpage, so how do i maintain using my masterpage and still inherit from System.Web.UI.Page?
Bear in mind that the .vb Code behind the masterpage already inherits System.Web.UI.MasterPage. Anybody know how i can "properly" override these methods in a MasterPage?
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Nov 18, 2009
Public Const COLUMN_MODEL_ORDER As String = MDL_ORDER.ColumnName
DataModel.Config.DefaultView is a System.Data.DataView
how can I convert it?:
Dim ModelOrder As Integer = 1
Dim DataModel As New ProfileDataModel(New DBConnection, Me.ProfileID)
If DataModel.Config.DefaultView.Count > 0 Then
[code]....
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Apr 28, 2010
I have a list of color values encoded as signed integers (OLE I think) in a legacy INI file that I need to translate into (A)RGB values with .NET. [code]...
gives an alpha-blended version of a color that is not at all what I expect. I think that a value like -2147483633 is supposed to represent a system-defined, or named color like ButtonFace. Is there a .NET method for translating these legacy colors properly? Note that pInvoke to OlePro32.dll is not an option.
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Jul 6, 2011
I'm building an c# app that is designed to replicate and enhance the functionality of an VB6 app developed many years ago. My problem is that one module in the old app does some realy complicated things and trying to replicate this starting from specs would be a big pain for me. Even if this sounds like the best idea.
My question is : is there a way i could keep the old VB module and integrate it into the c# app, so that i wouldn't have to rewrite everything ?
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Jul 31, 2009
Whats the best way to add an adornment layer to legacy controls, or in other words you know jetbrains refactoring tools, how do they draw the squiggly lines under incorrect text? Also on another note can one draw said adorments on controls not under the direct reference of the application, ie using a handle? If you have insights, or just theories,
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Jan 8, 2010
I am looking for a utility/tool to convert calls to legacy VB6 functions to the .NET equivalent. For example, it would convert this...
[Code]....
Does anybody know of one, or am I going to have to roll my own?
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Sep 21, 2010
I need to create a DLL that's callable from C, that executes database queries and returns results. The first tool I reached for was VB, and I found it easy to create a DLL, but when I view the DLL using dumpbin /exports, I don't see any functions.
So, my questions:
1) Is VB the right tool for the job? If not, (The ideal solution would be a 3rd-party DLL that will let me do database queries -- a friendly higher-level wrapper above ODBC. I've searched around and come up empty, but maybe I haven't looked in the right place).
2) If VB is the right tool for the job, how do I export a class method so that it's callable as a function in a legacy C environment?
More details:
1) The target environment is Mercury Loadrunner VUGen. It's able to import DLLs and make function calls, but the environment is (non-.NET) legacy C.
2) My development environment is MS Visual Studio 2008
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Sep 7, 2009
I have an old application in BASIC. It still runs under Windows ME. It no longer works under XP, so I was looking at recoding the applciation. I started coding it in VBA, which I have used for Excel macros for years.
We are looking at getting a new computer for kids to use for schoolwork, etc. I also want the kids to learn programming and recoding my old BASIC application is a good place to start. A new computer we were considering has MS Works, but I suspect I will need MS Office (at least Excel) to get VBA. There are multiple versions of Office 2007 (Home & School, Small Business, Pro), so I looked into the Microsoft website to see if I could find out what version of Office I need to get to have VBA. What I found is that VBA seems to be going away in favor of VSTA and VSTO.
Is VBA truely going away? Or is it still going to be a part of Excel for wrting macros? If VBA is part of Excel, is it available in all versions of Office? If VBA is going away, what is recommended for recoding my old BASIC application?
The application involves display of a screen full of data with color coding and has several actions for updating those data.It does not involve any graphics or animation. In the old BASIC application all the system data and runtime data are in program variables.
The actions to be performed are selected by number from menus.In creating the application in VBA, I envisioned primary data display on a main form, which would also have buttons to invoke dialog panels to perform the various updating actions.I have the system data that are not changed when the application is run in one Excel worksheet and the runtime data on another worksheet.
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Jan 3, 2012
When was isnumeric considered legacy code? I guess all that i have learned from my college class last semister is legacy.
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Jan 27, 2011
I understand the basics of using VB.NET, what I don't understand is what I need to tell the computer to do. I'm supposed to create a subprogram to calculate the greatest common factor and another subprogram to reduce the fraction from the answers retrieved from the first subprogram. My teacher said something about using Mod to calculate it, and also attempted and failed to explain ByVal and ByRef parameters. I don't even know where to begin other than the parameters I have for each, and even those have a high chance of being completely wrong.[code]
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Sep 1, 2010
Hint: this one might sound complicated, because I am trying to give as much info as possible, but I suspect that I just want someone to tell me "yes, you are correct".On this legacy system, which dates from 2002, the user visits a web page and uses an RFID reader to read a tag number, which is then written to an input field on the web page.
The only s/w that comes with the reader is a custom DLL, nop .exe. The very sparse documentation insists that only MSIE be used and that all security relating to ActiveX be disabled.When I look into the source of the web page I see calls to functions in the DLL.Now, here's the fun part: I know zilch about ActiveX, I have to make a minor change to the DLL _but_ the VB6 source code has been lost, so I guess that I have to recreate the (seemingly very simple) DLL from scratch - this week.
Decompiling the DLL shows me the functions (locateReader, getTagVal, closeReader). However, by decompiling I can't really know the number or type of the parameters, nor the return values ... and if anyone knows the API they are refusing to share it, but basically it all seems to have been lost in the mists of time as companies went bust, were bought & sold, merged & demerged and the initial DLL might have been written by an external guy, but no one knows who.So, can I get the function params & type from the ASP page source?I see things like
Reader = new ActiveXObject("<dllName>.Reader");
Reader.locateReader();
tagVal = Reader.getTagVal();
Reader.closeReader();
I would say that none of the fn()s take parameters, that closeReader doesn't have to return anything; it looks like locateReader doesn't return anything either, so I guess that error handling will have to be in the DLL (loop forever with a popup demanding that a reader be attached; and getTagVal seems to return a string.
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Jul 8, 2009
I have an old VB6 program which copies data from a legacy system (Btrieve 6) into our SQL Server so it can be served up on the web and used to feed some of our other needs. The legacy system outputs a file and a feed program posts it into the legacy ODBC database. The program isn't anywhere near realtime and I am now finding the delay between data going into the legacy database and then into the SQL database is becoming unacceptable so I thought I'd look at VB.NET and see if I could find a better way of doing it using FileSystemWatcher so that when the legacy output file is renamed I can then start a copy of the record affected from the legacy to the new database.
[Code]...
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May 13, 2011
I am trying to get a legacy vb.net application up and running and I need DSOleFile.dll.
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Jun 24, 2009
I downloaded nUnit and TestDriven.net. I have a legacy Web Site application and I would like to implement some unit testing. I created a class in the app_code folder and added Imports NUnit.Framework etc... After writing a basic test, I get the "Can't execute tests in 'Web Site' application." error. I guess the Web Site project is not supported. Converting to a Web Application is not an option at this time. I have Visual Studio Test Edition, so I tried that route. I created a test project, wrote a couple tests in my test class etc... only to find out I cannot reference the classes in the app_code folder of the Web Site project.
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Aug 30, 2009
I've been having complaints about my applications that they use to much memory.Is there a way to make them use less?
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Feb 7, 2012
I am currently working on an asp.net web page with a GridView displaying a table from a database.This GridView has 4 DropDownLists that will be used to filter the data shown on the GridView. When the page loads 4 Sub routines are run, each one connecting to the database with a select statement to fill the DropDownList with relevant filter headings.
Initially, I had one connection with a loop that populated all of the drop downs but these contained duplicates. I then split the filling of each DDL so that the select statements could contain DISTINCT. I would like (and am sure there is a way here) to be able to populate all of the DDLs with data from one connection.
Code for one connection:
Protected Sub FillDepDDL()
Dim conn As New SqlConnection()
conn.ConnectionString =
[code]....
The other 3 column names: FirstName > DDLFN, LastName > DDLLN, Wage > DDLWag.This is only a test DB and the princibles learned here will be applied to a larger live project.
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Aug 20, 2010
I have a legacy application that has an interactive graphical user interface, but also periodically checks for files in a directory and reacts to the files. I want to launch the application from a VB program, but not see the GUI (i.e., just let the file interface do it's thing). I really don't want to see the application running on the desktop at all (e.g., no windows, nothing on taskbar), the only evidence would be if I checked task manager I'd see it running.
Obviously this app would be ideally a service, but that's not where we are and I can't change it so I'm trying to simply not see the GUI.
I've seen the ProcessStartInfo.CreateNoWindow and WindowStyle = hidden flags but they don't hide the GUI of the legacy app.
again launch the legacy app (actually an unmanaged C++/MFC app) from a VB managed admin app.
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May 21, 2012
I've got an old legacy application for communicating via serial port to an embedded controller communications bus. that someone else developed.The application is written in VB6, and is structured as two projects - a DLL to handle the connection and communications logic, with an application GUI project.I was hoping to be able to write a new application GUI (in C++ ideally) to use the existing DLL as-is, but I'm having lots of problems working out how to import it.So I'm wondering, is it even going to be possible to use this old DLL into a C++ project as is? or is it possible to import into a C# project? or a VB.NET project? (would prefer not to use VB, but can if I have to)Where I am now: I have the existing compiled executable and DLL, and these run on my system.I also have the project files, and they're all readable in notepad++ but I don't have VB6, and importing the project into visual studio VB.NET 2008 express isn't at all straightforward. Especially not without a working example to dig through and play with first (DLL project may be importable, but has 50+ things indicated as needing changing in the upgrade report. It also seems to be ignoring three .cls files that look very important to my not particularly VB6-savvy eyes... The application project has a message in the upgrade report about something "missing a design time license" and the only project files that actually seem to come into the project explorer for imported project is the project file itself, and the assembly info file.)
Most examples of how to import a DLL into VS C++ assume you have a solution with the DLL project all compiling nicely alongside your project that will use it. Or at least a .DLL and .lib and .h file... I spoke with the original developer of the code (in another city, we don't work directly) and got a .lib to match my .dll, but still have no .h file.I'm usually fine to bash through something new, but without a baseline working example of the project even in VB6 that I can get my understanding from, it makes this very hard. Also a lack of similar questions anywher google can find them on the net makes me wonder if this is something i should be even attempting.I'm working on getting a non-express copy of visual studio if that will make any difference (express worked fine for everything up until now so I never needed anything more) but that will take a number of weeks, most likely.
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May 27, 2011
How would you go about reducing the code for this but still allowing it to work the way it is now
Dim updatelesson As String = cmbChange.SelectedIndex
Dim chosenlesson As String = cmbSession.SelectedIndex
Dim changed As String = lstNames.SelectedItem
[CODE]....
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Apr 27, 2009
I'm generating a list of names from my database, but I need to validate them so they are no longer than 15 characters.
Dim Name As String
Dim txtFirst = "../../Names/first.txt"
Dim txtLast = "../../Names/last.txt"
[Code]....
I need Name to be no longer than 15 characters, and it doesnt matter if the name stays in tact, it just needs to cut off characters from the end of the string until its 15 or less.
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Dec 23, 2011
In the process of creating an Icon object, I need to reduce the numbers of colors in an image from thousands down to 256 or less. I do this by "chromatizing" the RGB values - counting the colors - then re-iterating the process with heavier "chromatization" until the number of colors is reduced to my requirement.
I searched these forums and google on this subject to find out more - but I found that I alone call this process "chromatization" it seems. So I was hoping someone could help me out with the correct terminology.
Specifically, I want to use the correct terminology on my UI buttons (at present I have a button labeled [Chromatize] . .) and I am curious as to whether it would be good practice to "chromatize" the Green most heavily, the Red more moderately, and the Blue least . . . or just "chromatize" them all equally which is what I have been doing
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Oct 22, 2010
i am currently working on an application that reads the MAC addresses of all phones within the range of our bluetooth reader on the workstation. However, we would like to reduce the range of the reader to < 1 meter. I have dont alot of research and the only solution that i have found is a hardware one; i.e. changing the device to a class 3 or getting a custom made device that will have it's range adjusted to our preferences. However, i also know that we can adjust the power that runs through the bluetooth device in order to reduce the range. Is there any way that we can reduce the power of the device ? We don't have many funds atm and we're looking at a software solution and not a hardware one.
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Sep 14, 2010
I have a combo which contains a lot of different colours. If I press b it goes to the b's in the list and if I press it again it goes to the next b. Is it possible to jump to the colour as I type it so if I type blu it would go to blue. Currently it jumps to the first b when I type b but ignores the lu for blue.
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Nov 6, 2010
Dim a as string = "a"
Dim b as string = "b"
Dim c as string = "c"
[code]....
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Mar 2, 2009
Reading through "The Pragmatic Programmer", I've come across the DRY (Don't Repeat Yourself) and Orthagonal (keep code modular) principles.I have a suite of modules, some of which have common procedures. Because each module is a separate project in Visual Studio, up until now I have simply copied code from one project to another when 1 module (project) needs to do the same function as another module (project). This is when functionality overlaps, not when 2 modules (projects) do everything the same.
I always suspected this was bad practice (and have seen the fruits of my suspicions when the subs get out of sync), and the book confirmed me in this belief. So, what I want to do is make a central code repository for the 4 or 5 common subs, but I don't know how to do it.Should I make a .dll file for each sub I want to use in multiple places? If so, how do I do that? Is there another way to do what I want to do?
1. I have a subroutine that takes a filepath (and if disconnected also a SqlConnection) and loads the referenced file into a database as a BLOB.
2. I have 3 separate projects in 1 VS solution that all run basically the same version of this code.
3. I want all 3 to run EXACTLY the same code.
4. I want 1 version of this code so that any changes made don't need to be made in 3 places.
5. I have a few other instances like this for other subroutines.
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