带有小计算器的TextBox控件

/*[email protected]
需要的添加的控件，    
  private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.Panel panel1;
    private System.Windows.Forms.Button B_1;
    private System.Windows.Forms.Button B_N1;
    private System.Windows.Forms.Button B_N2;
    private System.Windows.Forms.Button B_N3;
    private System.Windows.Forms.Button B_N4;
    private System.Windows.Forms.Button B_N5;
    private System.Windows.Forms.Button B_N6;
    private System.Windows.Forms.Button B_N7;
    private System.Windows.Forms.Button B_N8;
    private System.Windows.Forms.Button B_N9;
    private System.Windows.Forms.Button B_N0;
    private System.Windows.Forms.Button B_ok;
    private System.Windows.Forms.Button B_Cancel;
    private System.Windows.Forms.Button B_J;
    private System.Windows.Forms.Button B_JJ;
    private System.Windows.Forms.Button B_C;
    private System.Windows.Forms.Button B_CC;
    private System.Windows.Forms.Button B_D;
    private System.Windows.Forms.Button B_B;
*/
using System;
using System.Collections;