C# TextBox 新增文本并定位光标

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms;   namespace HS_INSURANCE_PLATFORM_FORM.BaseTool {     public class ControlHelper     {         //定义一个用于保存静态变量的实例         private static ControlHelper instance = null;         //定义一个保证线程同步的标识         private static readonly object locker = new object();         //构造函数为私有，使外界不能创建该类的实例         private ControlHelper() { }         public static ControlHelper Instance         {             get             {                 if (instance == null)                 {                     lock (locker)                     {                         if (instance == null) instance = new ControlHelper();                     }                 }                 return instance;             }         }           public void TxbWriteValue(TextBox txtContent, string value)         {             Console.WriteLine(value);             txtContent.Text += value + "\r\n\r\n";             txtContent.Focus();//获取焦点             txtContent.Select(txtContent.TextLength, 0);//光标定位到文本最后             txtContent.ScrollToCaret();//滚动到光标处         }       } }