//byte[] sby = System.Text.Encoding.Unicode.GetBytes("宁绍");
        //string str = "";
        //for (int i = 0; i < sby.Length; i++)
        //{
        //    str += sby[i].ToString() + ",";
        //}
        //Label1.Text = str;
       // String a = "159343536267578990074874";
       //  String  a1="";
       //  char temp;
       //int b = a.Length;
       //char[] c = a.ToCharArray();
       //for(int i=0;i<b;i++)
       // for (int j=0;j<b-i-1 ; j++)
       // {
       // if (c[j]>=c[j+1])
       // {
       //  temp = c[j];
       //  c[j] = c[j+1];
       //  c[j+1] = temp;
       // }
       // }
       // for(int k=0;k<b;k++)
       //{
       //  this.Label1.Text=c[k].ToString()+",";
       //}
        //string str = "Hello";
        //string strRev = "";
        //char[] se = str.ToCharArray();
        //int len = se.Length;
        ////se=(char[])Array.Reverse(se);
        //for (int i = len - 1; i >= 0; i--)
        //{
        //    strRev += se[i].ToString();
        //}
        ////string strRev = new string();

        //this.Label1.Text = strRev;

        //string str = "Hello你好";      
        //char[] se = str.ToCharArray();       
        //Array.Reverse(se);
        //string strRev = new string(se);
        //decimal strRev = 'a'/ 'b';
        ////strRev = 127 / 2;
        //this.Label1.Text = strRev.ToString();

       // reserve();

private void reserve()
    {

       string str = "a";
            //System.Collections.Generic.Stack<char> cStack = new System.Collections.Generic.Stack<char>(str);

            //while (cStack.Count > 0)
            //{
            //    this.Label1.Text += cStack.Pop().ToString();
            //}
        //System.Text.StringBuilder str = new System.Text.StringBuilder("hello");
        // char temp;
        // for (int i = 0; i < str.Length / 2; i++)
        // {
        //     temp = str[i];
        //     str[i] = str[str.Length - 1 - i];
        //     str[str.Length - 1 - i] = temp;
        // }
        // this.Label1.Text = str.ToString();
        if (str == null)
        {
            return ;
        }
        if (str.Length == 0)
        {
            return ;
        }

        char[] data = str.ToCharArray();
        int iLeft = 0;
        int iRight = data.Length - 1;
        while (true)
        {
            if (iRight >= 0 && iLeft < iRight)
            {
                char temp = data[iLeft];
                data[iLeft] = data[iRight];
                data[iRight] = temp;
            }
            else
            {
                break;
            }
            iLeft++;
            iRight--;
        }
        String newStr = new String(data);
        this.Label1.Text = newStr;

    }

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