c#中怎么将字符串转化成GBK编码

c#中如何将字符串转化成GBK编码？
rt

[解决办法]

C# code

Encoding.GetEncoding("GBK").GetString(Encoding.Default.GetBytes(str))
[解决办法]
string   s="";  
byte[]   buffer= Encoding.GetEncoding( "GBK "); .GetBytes(S);  
byte[]   bUtf8=Encoding.Convert(Encoding.GetEncoding( "GBK"),Encoding.UTF8,   buffer);  
Text =Encoding.UTF8.GetString(bUtf8);