Edit any configuration file from any application

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C#

Hy there. I want to make an application that can modify any configuration file. I open a file dialog, select the file, populate some boxes with the information from the file, and lastly have a button "save information". Can I do this?

private void metroButton1_Click(object sender, EventArgs e)
       {
           OpenFileDialog openFileDialog1 = new OpenFileDialog();
           openFileDialog1.Filter = "Config Files|*.config";
           openFileDialog1.Title = "Slectează un fișier de configurări";
           if (openFileDialog1.ShowDialog() == DialogResult.OK)
           {
               textBox1.Text = openFileDialog1.FileName;
               filename = openFileDialog1.FileName;
           }
       }

string appName = "AdministrareRetele.exe";
            Configuration config = ConfigurationManager.OpenExeConfiguration(appName);
            ConnectionStringsSection section = config.GetSection("connectionStrings") as ConnectionStringsSection;

I don't know what to put at "ConfigurationManager"...

Thank you!

EDIT

I can get all the information I want from the configuration file of the CURRENT application. But I want to be able to get and modify info for other application.

Current scenario:

I have 2 files: App.exe and app.config in SAME folder. I write this code:

string appName = "App.exe";
            Configuration config = ConfigurationManager.OpenExeConfiguration(appName);
            ConnectionStringsSection section = config.GetSection("blabla") as ConnectionStringsSection;

and I get information about my current app (App.exe)

Now, I need to modify "OpenExeConfiguration" method or write a new one that will read a config file that i give as a parameter..

Hope, this time made it clear