Configuration Manager is not saving in app.config

Question

I have this app.config :

<?xml version="1.0"?>
<configuration>
<configSections>
</configSections>
<connectionStrings>
  <add name="conexx" connectionString="Data Source=192.168.1.2 ;Initial Catalog   =ifdcontroladoria3 ;uid =sa;pwd = admin2012" providerName="System.Data.SqlClient" />
</connectionStrings>
<startup><supportedRuntime version="v4.0"   sku=".NETFramework,Version=v4.0,Profile=Client"/></startup></configuration>

I m trying to update this connectring with this C# :

  coneydstr = @"Data Source=" + comboBox1.Text + ";Initial Catalog =" + cmbBancos.Text + ";uid =" + txtUsuario.Text + ";pwd =" + txtPassword.Text;
        try
         { coneyd.ConnectionString = coneydstr; 
           coneyd.Open(); 
           funciona = true;
           lblStringSalida.Text = coneydstr;
         }
         catch (Exception ex)
        {  MessageBox.Show(coneyd + ex.Message.ToString());  }

        if (funciona)
        { 
          Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
          config.ConnectionStrings.ConnectionStrings["conexx"].ConnectionString = coneydstr;
          config.Save();   
        } 

but is not making update ,

 using System.Configuration;

is in the header and the reference , what is wrong?????

I have write wrong the problem, i want to store the connectionstring somewhere maybe app.config or other file , and change the string in another install or when then server or user changes. What the right way to do this???

Answer 1

Well, your problem most likely is that you're looking at the wrong file. Look at the config.FilePath property in the debugger - it will tell you exactly which file you're dealing with here and now.

When you run this code in Visual Studio, your code will change the Yourapplication.exe.config inside your project\bin\debug directory - it will NOT change the app.config in your project directory!

So when you run your code - after the config.Save(), have a look at your project's \bin\debug directory and the config file inside there - are those values properly updated?