Question

Saving to App.Config

Asked by: smaguire

I've been reading all sort of questions about writing to the app.config file and yet have not found a good answer that will show me how to accomplish that. I am usinf framework 3.5 and visual studio 2008 and I need to change some values in my config file through a windows form. I don't want to creat another xml file. is there a way to save to the app.config file?

thanks a lot

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2008-03-29 at 17:21:30ID23280108
Tags

C#

,

VS 2008 Pro

Topics

.Net Editors & IDEs

,

Microsoft Visual C#.Net

,

.NET Framework 3.x versions

Participating Experts
2
Points
250
Comments
7

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. How writing to the app.config in visual studio 2005
    Hello, I would like to know how I've to write to the app.config with visual studio 2005. (this without using xml obj) Thanks !!
  2. Edit App.config
    Is it possible to edit an app.config file at runtime, I would like to use it as an editable file where a user can save his config parameters, do I have to create a separate config file for that. Appreciate the help vb
  3. How do I disable the creation of  *.exe.config  file when…
    Hello, After adding an App.config file to a C# .NET Framework v1.1 project in Visual Studio 2003 I noticed that in the debug\bin directory a *.exe.config file was created as well as the App.config file. I would like to have only the App.config file in my root project direct...
  4. Writing to app.config
    Hi experts, I used this resource http://ryanfarley.com/blog/archive/2004/07/13/879.aspx (now in vb.net) to write to my app.config at runtime. so far there are no errors only that the app.config file is not updated at runtime. here is the code ========================...
  5. app.config manipulation across projects.
    I have a Visual Basic Solution with two projects, a Windows Service (DiskService) and a Windows Application (DiskServiceConfig). I am using the app.config file in the Windows Service for a few custom settings such as SMTP server to send email and a few integers. What I ...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: jaime_olivaresPosted on 2008-03-30 at 11:27:33ID: 21241472

config file is saved automatically, just you have to edit the "settings" variables.
in your solution explorer, look at the Properties node, then dobule click the "settings.settings" node.
Insert variables there, there are 2 kind of "scopes" for each variable.
Aplication scope define readonly variables
User scope define read/write variables.
Both will be stored automatically.

To read or write a setting variable, use something like:

     Properties.Settings.Default.varnamehere

 

by: p_davisPosted on 2008-03-30 at 19:41:52ID: 21242862

here is an example of how to save some value  from a textbox text value to your config file

//class members
 
ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
KeyValueConfigurationElement kvce;
Configuration config;
 
//constructor
public Form1()
{
  InitializeComponent();
  fileMap.ExeConfigFilename = fileMap.ExeConfigFilename = @"path_to_your_file";
  config = configurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None) as Configruation;
 
//get some value from a key value in the configuration file...
txtSomeTextBoxValue.Text = config.AppSettings.Settings["someKeyVariable"].Value.ToString();
}
 
private void button_Click(object sender, EventArgs e)
{
   kvce.value = txtSomeTextBoxValue.Text;
   //save value of textbox back to the config file....
   config.Save(ConfigurationSaveMode.Minimal, true);
}
}

                                              
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:

Select allOpen in new window

 

by: smaguirePosted on 2008-03-31 at 09:46:21ID: 21247025

thank you guys for your reply,
p_davis, when i am trying to assign value to kvcs.Vaue i get the following error:
"Object reference not set to an instance of an object." and i create the line above it, which allows me to retrieve value from my config file just fine, so it must have been initialized, i don't know why i am getting this error.
the following line worked for me:
txtSomeTextBoxValue.Text = config.AppSettings.Settings["someKeyVariable"].Value.ToString();

PS:
in your code:
kvce.value = txtSomeTextBoxValue.Text;
how does the kvce value know to which appSetting variable will it save to? I mean my appSetting will have something like:
AppSettings.Settings["someKeyVariable1"].
AppSettings.Settings["someKeyVariable2"].
AppSettings.Settings["someKeyVariable3"].

and you say: kvce.value = txtSomeTextBoxValue.Text;
will you be assign the kvce value to someKeyVariable1 or someKeyVariable2 or ..etc

thank you for your help

I am raising the points to 250


 

by: p_davisPosted on 2008-03-31 at 10:05:35ID: 21247190

kvce = config.AppSettings.Settings["someKeyVariable"];

sorry forgot to add this to the form load event

 

by: smaguirePosted on 2008-03-31 at 10:21:59ID: 21247318

thanks davis, we are almost there,
two questions:
1- I guess when in run mode the app file becomes app.exe.config and when in solution its app.config? is that why the results show only in app.exe.config?
2- if i have more than one AppSettings variable should i create the following:
kvce1 = config.AppSettings.Settings["someKeyVariable1"];
kvce2 = config.AppSettings.Settings["someKeyVariable2"];
... etc ?

thanks again

 

by: p_davisPosted on 2008-03-31 at 10:27:34ID: 21247356

1. to effect the program when running you do need to modify the app.exe.config. this is what the program uses.
2. yes

 

by: smaguirePosted on 2008-03-31 at 10:29:08ID: 31444153

Thank you. It works

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...