using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;


namespace sxLdfang
{
    class Program
    {
        static void  Main()
        {
            string s = "44564941303233322E350D0A44564942303233342E320D0A44564943303232392E360D0A44564F41303232382E310D0A44564F42303232342E350D0A44564F43303232392E310D0A444C4F41303032382E340D0A444C4F42303035302E320D0A444C4F43303033322E360D0A44544D50303034322E300D0A44485A46303035302E300D0A44564254303434302E310D0A4456424E303030302E300D0A44544D42303132302E300D0A4456424C303130302E300D0A";
            byte[]buff=new byte[s.Length];
            int index=0;
            for (int i = 0; i < s.Length; i += 2)
            {
                buff[index] = Convert.ToByte(s.Substring(i, 2), 16);
                ++index;
            }
            string result = Encoding.Default.GetString(buff);
            Console.Write(result);

        }
    }
}

------解决方案--------------------
错了一点，byte数组大小修改一下：
C# code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;


namespace sxLdfang
{
    class Program
    {
        static void  Main()
        {
            string s = "44564941303233322E350D0A44564942303233342E320D0A44564943303232392E360D0A44564F41303232382E310D0A44564F42303232342E350D0A44564F43303232392E310D0A444C4F41303032382E340D0A444C4F42303035302E320D0A444C4F43303033322E360D0A44544D50303034322E300D0A44485A46303035302E300D0A44564254303434302E310D0A4456424E303030302E300D0A44544D42303132302E300D0A4456424C303130302E300D0A";
            byte[]buff=new byte[s.Length/2];
            int index=0;
            for (int i = 0; i < s.Length; i += 2)
            {
                buff[index] = Convert.ToByte(s.Substring(i, 2), 16);
                ++index;
            }
            string result = Encoding.Default.GetString(buff);
            Console.Write(result);

        }
    }
}