Change connection string & reload app.config at run time

Admin 1
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When I change the connection string using this code, it does not reload app.config at runtime. I expected it to reload similarly to how we reload app.config.

config.ConnectionStrings.ConnectionStrings["JVVNL_NEW.Properties.Settings.JVVNL_NEWConnectionString1"].ConnectionString = ConString;
config.ConnectionStrings.ConnectionStrings["CMS_NEW.Properties.Settings.JVVNL_NEWConnectionString1"].ConnectionString = ConString;
config.Save(ConfigurationSaveMode.Modified,true);
ConfigurationManager.RefreshSection(config.ConnectionStrings.SectionInformation.SectionName);
configuration c#
8 Answers

IIRC, the ConfigurationManager.RefreshSection requires a string parameter specifying the name of the Section to refresh :

ConfigurationManager.RefreshSection("connectionStrings");

I think that the ASP.NET application should automatically reload when the ConnectionStrings element is modified and the configuration does not need to be manually reloaded.

Cerebrus_537180

Yeah, when ASP.NET web.config gets updated, the whole application gets restarted which means the web.config gets reloaded.

user_601170

You can also refresh the configuration in it's entirety:

ConnectionStringSettings importToConnectionString = currentConfiguration.ConnectionStrings.ConnectionStrings[newName];

if (importToConnectionString == null)
{
    importToConnectionString = new ConnectionStringSettings();
    importToConnectionString.ConnectionString = importFromConnectionString.ConnectionString;
    importToConnectionString.ProviderName = importFromConnectionString.ProviderName;
    importToConnectionString.Name = newName;
    currentConfiguration.ConnectionStrings.ConnectionStrings.Add(importToConnectionString);
}
else
{
    importToConnectionString.ConnectionString = importFromConnectionString.ConnectionString;
    importToConnectionString.ProviderName = importFromConnectionString.ProviderName;
}

Properties.Settings.Default.Reload();
Neil_Barnwell_264140

Here's the method I use:

public void AddOrUpdateAppConnectionStrings(string key, string value)
{
    try
    {
        var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        var settings = configFile.ConnectionStrings.ConnectionStrings;
        if (settings[key] == null)
        {
            settings.Add(new ConnectionStringSettings(key,value));
        }
        else
        {
            settings[key].ConnectionString = value;
        }
        configFile.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection(configFile.ConnectionStrings.SectionInformation.Name);
        Properties.Settings.Default.Reload();
    }
    catch (ConfigurationErrorsException)
    {
        Console.WriteLine("Error writing app settings");
    }
}
user_145025820
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