“System.Windows.Forms.UserControl”并不包含“selUser”的定义那个if语句没执行,因为它写在这个方法中,而这个方法也不能用.在UserControl类中写这个方法了.为什么还会提示这样的错?

帮我注释一下每行代码,就是解释下每行的意思,谢谢了using System;using System.Globalization;using System.Text.RegularExpressions;using System.Windows.Forms; namespace Text{ public partial class Form1 : Form { private s 关于c# using systemusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms; C# system.windows.forms.control[]转换到system.windows.forms.TextBox问题system.windows.forms.control[]转换到system.windows.forms.TextBox时提示不能转换?TextBox txtsta = (TextBox)this.Controls.Find(txtStatus + i,true);我说的是winfor Windows was the first operating system to develop a mouse. 翻译：Window is widely used in the Windows operating system using System; using System.Collections.Generic; using System.Windows.Forms; namespace gxz { static using System;using System.Collections.Generic;using System.Windows.Forms;namespace gxz{static class Program{/// /// 应用程序的主入口点./// [ST 摄氏温度和华氏温度之间的转换.using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace _11_1{public partial to transplant Oracle Form based system to Java web system 怎么翻译? 求0-100所有的质数用c#编写using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace WindowsApplication2{ public partial class For 英语翻译the drivers without installation links on the right are bundled in windows operating system already windows 后面的s是系统的意思吗?system是这个英语的首字母吗? the MSS DLL isincorrectly installed in the windows system directory啥意思? System SYSTEM. system system. system system