Unable to chage app.config value dynamically

Question

1.00/5 (1 vote)

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VS2010

I am using Visual Studio, after searching i've found this following code to modify app.config file dynamically

Configuration configFile = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
configFile.AppSettings.Settings["Servername"].Value = "Server-PC";
configFile.Save();

But while applying this in pmy project i am getting this following error

Quote:
Error 35 The type or namespace name 'Configuration' could not be found (are you missing a using directive or an assembly reference?)

and

Quote:
Error 36 The name 'ConfigurationManager' does not exist in the current context

Can anyone please suggest me how to change app.config value dynamically?

Posted 18-Nov-12 17:47pm

sahabiswarup

Updated 18-Nov-12 18:10pm

v2

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Comments

Sergey Alexandrovich Kryukov 18-Nov-12 23:59pm

Wrong question. Why would you change it? It is not designed for such things. You got this wrong idea having some purpose in mind. Explain this purpose to get help on more reasonable approach. Always explain your ultimate goals when asking questions.
--SA

sahabiswarup 19-Nov-12 0:09am

Actually i want to change the database server name frequently; and i've stored the name in app.config file so i need to chage the app.config value.

2 solutions

Solution 1

Add Reference of

C#

System.Configuration

in your project.
if you added this reference then add below namespace on your page

C#

using System.Configuration;

Posted 18-Nov-12 18:04pm

AditSheth

Comments

sahabiswarup 19-Nov-12 0:09am

i've added but still getting the error.

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sahabiswarup · Accepted Answer · 2012-11-18T23:01:00

Finally i've got the solution
check this link[^]

// Open App.Config of executable
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            // Add an Application Setting.
            config.AppSettings.Settings.Remove("connection");
            config.AppSettings.Settings.Add("connection", server);
            // Save the configuration file.
            config.Save(ConfigurationSaveMode.Modified);
            // Force a reload of a changed section.
            ConfigurationManager.RefreshSection("appSettings");