I want to change app config connection string

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I want to change app config connection string, through a code

My SourceCode

C#

string connString = "";

connString = "Data Source=" + Convert.ToString(txtServer.EditValue) + ";" + 
             "Initial Catalog=" + Convert.ToString(txtDatabase.EditValue) + ";" +
             "User id=" + Convert.ToString(txtUserName.EditValue) + ";" +
             "Password=" + Convert.ToString(txtPassword.EditValue) + ";";

var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConnectionStringsSection connSection =    
    (ConnectionStringsSection)config.GetSection("connectionStrings");
connSection.ConnectionStrings["INATTSQLConnString"].ConnectionString = connString;
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");

but when i saw in my app.config, this file isn't modified.

can somebody help me, please?

Thanks

Posted 5-Jun-14 4:27am

FX Andy Widjaja

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Vi(ky 5-Jun-14 10:32am

Once check YourAppName.vshost.exe.config in debug or release folder in bin directory of project.

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Pete_H · Accepted Answer · 2014-06-05T06:35:00

This has been tested to work. The only difference is that it omits the "GetSection".
Remember that if you are testing this in a debug session and you are using the vs host, this change will be applied to the appName.vshost.exe.Config file.

public static void ModifyConnectionString(string connectionString)
{
   Configuration config =             
      ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
   ConnectionStringSettingsCollection connectionStrings = 
      config.ConnectionStrings.ConnectionStrings;
   connectionStrings["INATTSQLConnString"].ConnectionString = connectionString;
   config.Save();

    ConfigurationManager.RefreshSection("connectionStrings");
}