Add values to app config and retrieve them

Question

I need to insert key value pairs in app Config as follows    lt configuration gt    lt appSettings gt       lt add key  Setting1  value  Value1    gt       lt add key  Setting2  value  Value2    gt    lt  appSettings gt   lt  configuration gt    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

User · Answer

I hope this works    System Configuration Configuration config  ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None    config AppSettings Settings  Yourkey   Value    YourValue   config Save ConfigurationSaveMode Modified

User · Answer

To Get The Data From the App config  Keeping in mind you have to    Added to the References -  System Configuration 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 · Answer

sorry for late answer but may be my code may help u   I placed 3 buttons on the winform surface  button1  amp  2 will set different value and button3 will retrieve current value  so when run my code first add the reference System configuration  and click on first button and then click on 3rd button to see what value has been set  next time again click on second  amp  3rd button to see again what value has been set after change   so here is the code   using System Configuration    private void button1 Click object sender  EventArgs e        Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath       config AppSettings Settings Remove  DBServerName        config AppSettings Settings Add  DBServerName    FirstAddedValue1        config Save ConfigurationSaveMode Modified      private void button2 Click object sender  EventArgs e        Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath       config AppSettings Settings Remove  DBServerName        config AppSettings Settings Add  DBServerName    SecondAddedValue1        config Save ConfigurationSaveMode Modified      private void button3 Click object sender  EventArgs e        Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath             MessageBox Show config AppSettings Settings  DBServerName   Value

User · Answer

This works   public static void AddValue string key  string value        Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath       config AppSettings Settings Add key  value       config Save ConfigurationSaveMode Minimal

User · Answer

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 · Answer

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

[c#] Add values to app.config and retrieve them

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