Read and modify the C#appconfig

First, C # read AppConfig content

private void Button1_Click (object sender, EventArgs e)
{
String Filename=system.io.path.getfilename (Application.executablepath);
Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration (fileName);
String value = Config. appsettings.settings["IP"]. Value = Txtip.text;
string value1 = config. appsettings.settings["username"]. Value = txtUsername.Text;
string value2 = config. appsettings.settings["Userpwd"]. Value = txtPassword.Text;
Config. Save ();
MessageBox.Show ("Saved successfully! ");

}

Ii. Modification of AppConfig

private void Serversetting_load (object sender, EventArgs e)
{
String fileName = System.IO.Path.GetFileName (Application.executablepath);
Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration (fileName);
string ip = config. appsettings.settings["IP"]. Value;
string username = config. appsettings.settings["username"]. Value;
string userpwd = config. appsettings.settings["Userpwd"]. Value;
Txtip.text = IP;
txtUsername.Text = Username;
txtPassword.Text = userpwd;
}

Read and modify the C#appconfig