private string numberToEnglish(decimal y)
  {
   string numberStr="";
   string lStr="";//小数点左边字符串
   string rStr="";//小数点右边字符串
   numberStr = (string) y.ToString();
   int dot;//小数点位置
   dot = numberStr.IndexOf(".");
   if (dot!= 0 & dot !=-1)//判断有没有小数
   {
    lStr=numberStr.Substring(0,dot);//取小数点left的字串
    if (numberStr.Substring(dot+1,2)=="00")
    {
     rStr="";
    }
    else
    {
     rStr=numberStr.Substring(dot+1,2);//取小数点right的字串
    }
   }
   else
   {
    lStr=numberStr;//没有小数点的情况
   }
   string lStrRev;
   lStrRev=reverseString(lStr);//对左边的字串取反字串
   string [] a= new string[5];//定义5个字串变量用来存放解析出的三位一组的字串
   
   switch(lStrRev.Length % 3)
   {
    case 1:
     lStrRev = lStrRev + "00";break;

    case 2:
     lStrRev = lStrRev + "0";break;

   }
   string StrInt;//用来存放转换后的整数部分
   StrInt="";
   for(int i=0;i<=lStrRev.Length/3 -1;i++)//计算有多少个三位 
   {
    a[i]=reverseString(lStrRev.Substring(3*i,3));//截取第1个三位
    if (a[i] != "000")//用来避免这种情况“1000000=ONE MILLION THOUSAND ONLY”
    {
     if (i!=0)
     {
      StrInt=w3(a[i]) + " " + dw(i.ToString()) + " " + StrInt;//用来加上“THOUSAND OR MILLION OR BILLION” 
     }
     else 
     {
      StrInt=w3(a[i]);//防止i=0时“lm=w3(a(i))+" "+dw(i)+" "+lm”多加两个尾空格
     }
    }
    else
    {
     StrInt=w3(a[i]) + StrInt;
    }
   }
   string StrDce;//用来存放转换后的小数部分
   StrDce="";
   if ( dot != 0 & dot != -1 & rStr != "")
   {
    rStr="0" + rStr;
    StrDce=" AND POINT " + w2(rStr);
   }
   return StrInt + StrDce;
  }
  //将字符串反置
  private string reverseString(string str)
  {
   int lenInt=str.Length;
   string [] z= new string [str.Length];
   for(int i=0;i<lenInt;i++)
   {
    z[i]=str.Substring(i,1);
   }
   str="";
   for (int i=lenInt-1;i>=0;i--)
   {
    str=str+z[i];
   }
   return str;
  }
  private string zr4(string y)
  {
   string[] z= new string [10];
   z[1]="ONE";
   z[2]="TWO";
   z[3]="THREE"; 
   z[4]="FOUR"; 
   z[5]="FIVE"; 
   z[6]="SIX"; 
   z[7]="SEVEN"; 
   z[8]="EIGHT"; 
   z[9]="NINE"; 
   return z[Int32.Parse(y.Substring(0,1))];
  }
  private string zr3(string y)
  {
   string[] z= new string [10];
   z[1]="ONE";
   z[2]="TWO";
   z[3]="THREE"; 
   z[4]="FOUR"; 
   z[5]="FIVE"; 
   z[6]="SIX"; 
   z[7]="SEVEN"; 
   z[8]="EIGHT"; 
   z[9]="NINE"; 
   return z[Int32.Parse(y.Substring(2,1))];
  }
  private string zr2(string y)
  {
   string[] z= new string [20];
   z[10]="TEN";
   z[11]="ELEVEN";
   z[12]="TWELVE"; 
   z[13]="THIRTEEN"; 
   z[14]="FOURTEEN"; 
   z[15]="FIFTEEN"; 
   z[16]="SIXTEEN"; 
   z[17]="SEVENTEEN"; 
   z[18]="EIGHTEEN";
   z[19]="NINETEEN";
   return  z[Int32.Parse(y.Substring(1,2))];
  }
  private string zr1(string y)
  {
   string[] z= new string [10];
   z[1]="TEN"; 
   z[2]="TWENTY"; 
   z[3]="THIRTY"; 
   z[4]="FORTY";
   z[5]="FIFTY"; 
   z[6]="SIXTY"; 
   z[7]="SEVENTY"; 
   z[8]="EIGHTY"; 
   z[9]="NINETY"; 
   return z[Int32.Parse(y.Substring(1,1))];
  }
  private string dw(string y)
  {
   string[] z= new string[5];
   z[0]="";
   z[1]="THOUSAND";
   z[2]="MILLION";
   z[3]="BILLION";
   return z[Int32.Parse(y)];
  }
  //用来制作2位数字转英文 
  private string w2(string y)
  {