Adding a new setting in Settings.setting file

Question

This is the code i am using to add a new setting to the settings.settings file but it is not working.

System.Configuration.SettingsProperty property = new System.Configuration.SettingsProperty("CustomSetting");

property.DefaultValue = "Default";
property.IsReadOnly = false;
property.PropertyType = typeof(string);
property.Provider = Properties.Settings.Default.Providers["LocalFileSettingsProvider"];
property.Attributes.Add(typeof(System.Configuration.UserScopedSettingAttribute), new System.Configuration.UserScopedSettingAttribute());

Properties.Settings.Default.Properties.Add(property);
// Load settings now.
Properties.Settings.Default.Reload();
// Update the user itnerface.

Properties.Settings.Default["CustomSetting"] = txt_Cipher.Text;
Properties.Settings.Default.Save();
txt_Cipher.Text = string.Empty;

The new setting is not being added in the settings file. This is the new code i have been trying according to sumesh's reply.

System.Configuration.SettingsProperty property = new System.Configuration.SettingsProperty("CI");
                Properties.Settings.Default["CI"] = txt_Cipher.Text;
                Properties.Settings.Default.Save();
                Properties.Settings.Default.Reload();
                txt_Cipher.Text = string.Empty;

I have already created a setting in the settings.setting file as said in the Image by sumesh.

Answer 1

Add CustomSetting manually in your settings.settings file

System.Configuration.SettingsProperty property = new System.Configuration.SettingsProperty("CustomSetting");


Properties.Settings.Default["CustomSetting"] = txt_Cipher.Text;
Properties.Settings.Default.Save();
txt_Cipher.Text = string.Empty;

use this code to update the settings

its working fine for me and an xml file is created for this settings as

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <userSettings>
        <WindowsFormsApplication1.Properties.Settings>
            <setting name="CustomSetting" serializeAs="String">
                <value>1</value>
            </setting>
        </WindowsFormsApplication1.Properties.Settings>
    </userSettings>
</configuration>

Please add customsSettings as shown in the picture