我这里有个加密解密算法，但是解密后中文出现了乱码。求高手指教： 我的代码如下：

public string RSAEncrypt(string encryptString)
{
CspParameters csp = new CspParameters();
csp.KeyContainerName = "whaben";
RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(csp);
byte[] encryptBytes = RSAProvider.Encrypt(ASCIIEncoding.ASCII.GetBytes(encryptString), true);
string str = "";
foreach (byte b in encryptBytes)
{
str = str + string.Format("{0:x2}", b);
}
return str;
}
//解密算法
public string RSADecrypt(string decryptString)
{
CspParameters csp = new CspParameters();
csp.KeyContainerName = "whaben";
RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(csp);
int length = (decryptString.Length / 2);
byte[] decryptBytes = new byte[length];
for (int index = 0; index < length; index++)
{
string substring = decryptString.Substring(index * 2, 2);
decryptBytes[index] = Convert.ToByte(substring, 16);
}
decryptBytes = RSAProvider.Decrypt(decryptBytes, true);
return ASCIIEncoding.ASCII.GetString(decryptBytes);
// return System.Text.Encoding.UTF8.GetString(decryptBytes);

}

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