C# 如何从用户控件访问默认设置？

如何从用户控件访问默认设置

当我使用这个代码时

namespace SearchControl{
public partial class SearchControl : UserControl   
{
     string ConncStr = Properties.Settings["myConnectionString"].toString();
}}

不起作用

Properties.Settings["myConnectionString"].toString()

我想访问属性。设置[“myConnectionString”]

---

在usercontrol添加到其上的项目的usercontrol中。

大多数语句以

结尾不是
}

namespace SearchControl;

public partial class SearchControl : UserControl   
{
 string ConncStr = Properties.Settings.Default.myConnectionString;
}

看
你不理解我。
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var secGroup = config.SectionGroups["userSettings"]; // or applicationSettings

if (secGroup != null)
{
    var clientSettings = (ClientSettingsSection)secGroup.Sections[0];

    var settingElementCollection = clientSettings.Settings;

    var setting = settingElementCollection.Get(Name);

    var value = setting.Value.ValueXml.InnerText;
}

string conStr = Properties.Settings.Default.myConnectionString;