解码错误？？？？

[qq_34610889]

private void button1_Click(object sender, EventArgs e)
{
Encoding encoding = Encoding.GetEncoding(this.comboBox1.SelectedValue + "");//获取编码方式
bytes = encoding.GetBytes(this.textBox1.Text);//进行编码
string str = "";
foreach (var item in bytes)
{
str += item+" ";
}
this.labencoding.Text = @str;
}

private void button2_Click(object sender, EventArgs e)
{
this.label6.Text = Encoding.UTF8.GetString(bytes);
}