Add values to app.config and retrieve them

user_94169 0
Viewed 177958

I need to insert key value pairs in app.Config as follows:

<configuration>
 <appSettings>
    <add key="Setting1" value="Value1" />
    <add key="Setting2" value="Value2" />
 </appSettings>
</configuration>

When I searched in google I got the following code snippet

System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); // Add an Application Setting.

config.AppSettings.Settings.Add("ModificationDate",
               DateTime.Now.ToLongTimeString() + " ");

// Save the changes in App.config file.

config.Save(ConfigurationSaveMode.Modified);

The above code is not working as ConfigurationManager is not found in System.Configuration namespace I'm using .NET 2.0. How to add key-value pairs to app.Config programatically and retrieve them?

c#
6 Answers

Are you missing the reference to System.Configuration.dll? ConfigurationManager class lies there.

EDIT: The System.Configuration namespace has classes in mscorlib.dll, system.dll and in system.configuration.dll. Your project always include the mscorlib.dll and system.dll references, but system.configuration.dll must be added to most project types, as it's not there by default...

Arjan_Einbu_195940

Try adding a Reference to System.Configuration, you get some of the configuration namespace by referencing the System namespace, adding the reference to System.Configuration should allow you to access ConfigurationManager.

user_19969730

To Get The Data From the App.config

Keeping in mind you have to:

  1. Added to the References -> System.Configuration
  2. and also added this using statement -> using System.Configuration;

Just Simply do this

string value1 = ConfigurationManager.AppSettings["Value1"];

Alternatively, you can achieve this in one line, if you don't want to add using System.Configuration; explicitly.

string value1 = System.Configuration.ConfigurationManager.AppSettings["Value1"]
user_61837770
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