1、C# textbox中光标定位到最后一行
this.txtboxXSNum.Focus();//获取焦点
this.txtboxXSNum.Select(this.txtboxXSNum.TextLength, 0);//光标定位到文本最后
this.txtboxXSNum.ScrollToCaret();//滚动到光标处
this.txtboxXSNum.Focus();//获取焦点
this.txtboxXSNum.Select(this.txtboxXSNum.TextLength, 0);//光标定位到文本最后
this.txtboxXSNum.ScrollToCaret();//滚动到光标处