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var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringSettings =
new ConnectionStringSettings("ConnectionString", _arguments["connectionString"], "System.Data.SqlClient");
config.ConnectionStrings.ConnectionStrings.Add(connectionStringSettings);
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("connectionStrings");
pixel Saving a connectionString at runtime to .NET app.config
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