How to Add Multiple Username and password In appsettings in app.config?

<configSections>
    <section name="MultiValue1" type="System.Configuration.NameValueSectionHandler" />
  </configSections>
  <MultiValue1>
    <add key="Credential1" value="abc|123" />
    <add key="Credential2" value="pqr|456" />
  </MultiValue1>

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public static List<string> GetMultiValue(string name)
        {
            List<string> returnValues = new List<string>();

            try
            {
                NameValueCollection rules = ConfigurationManager.GetSection(name) as NameValueCollection;

                foreach (string ruleName in rules)
                {
                    try
                    {
                        returnValues.Add(rules[ruleName]);
                    }
                    catch
                    {
                        //Rule failed
                    }
                }
            }
            catch (Exception ex)
            {
                //Config failed
            }

            return returnValues;
        }

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