【will】string 和 base-64 string转换

string textToBase64(string sAscii) 
{ 
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); 
byte[] bytes = encoding.GetBytes(sAscii); 
return System.Convert.ToBase64String(bytes, 0 , bytes.Length); 
} 
string base64ToText(string sbase64) 
{ 
byte[] bytes = System.Convert.FromBase64String(sbase64); 
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); 
return encoding.GetString(bytes,0,bytes.Length); 
}