Change the value in app config file dynamically

Question

I want to modify a value in appSetting section in app config  So i wrote   Console WriteLine ConfigurationManager AppSettings  name     Console Read    Configuration config ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None     config AppSettings Settings  name   Value    raja          config Save ConfigurationSaveMode Modified     ConfigurationManager RefreshSection  appSettings    Console WriteLine ConfigurationManager AppSettings  name     Console Read      after the execution of above code  i verified the app config whether the value of  name  element has been  changed or not  but no change   what is the wrong with my code  or is there any other way to do this

User · Answer

You have to update your app config file manually     Load the app config file XmlDocument xml   new XmlDocument    xml Load AppDomain CurrentDomain SetupInformation ConfigurationFile       Do whatever you need  like modifying the appSettings section     Save the new setting xml Save AppDomain CurrentDomain SetupInformation ConfigurationFile     And then tell your application to reload any section you modified  ConfigurationManager RefreshSection  appSettings

User · Answer

This code works for me       Configuration config   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None        config AppSettings Settings  test   Value    blah              config Save ConfigurationSaveMode Modified       ConfigurationManager RefreshSection  appSettings      Note  it doesn t update the solution item  app config   but the   exe config  one in the bin  folder if you run it with F5

User · Answer

XmlReaderSettings  configsettings   new XmlReaderSettings      configsettings IgnoreComments   true    XmlReader  configreader   XmlReader Create ConfigFilePath   configsettings    XmlDocument doc config   new XmlDocument     doc config Load  configreader     configreader Close      foreach  XmlNode RootName in doc config DocumentElement ChildNodes          if  RootName LocalName     appSettings                   if  RootName HasChildNodes                          foreach  XmlNode  child in RootName ChildNodes                                  if   child Attributes  key   Value     HostName                                           if   child Attributes  value   Value     false                             child Attributes  value   Value    true                                                           doc config Save ConfigFilePath

User · Answer

It works  just look at the bin Debug folder  you are probably looking at app config file inside project

User · Answer

Expanding on Adis H s example to include the null case  got bit on this one    Configuration config   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None               if  config AppSettings Settings  HostName      null                  config AppSettings Settings  HostName   Value   hostName              else                                 config AppSettings Settings Add  HostName   hostName                               config Save ConfigurationSaveMode Modified               ConfigurationManager RefreshSection  appSettings

User · Answer

Try   Configuration config   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None   config AppSettings Settings Remove  configFilePath    config AppSettings Settings Add  configFilePath   configFilePath   config Save ConfigurationSaveMode Modified true   config SaveAs   C  Users USERNAME Documents Visual Studio 2010 Projects ADI2v1 4 ADI2CE2 App config  ConfigurationSaveMode Modified  true

[c#] Change the value in app.config file dynamically

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