c# rsa注册实现加密文字

rsacryptoserviceprovider rsa = new rsacryptoserviceprovider();

private void btencoding_click(object sender, eventargs e)
{
    if (mbox.text == "")
    {
        messagebox.show("加密文字信息不能为空！");
        return;
    }
    if (publickey.text == "")
    {
        messagebox.show("请生成公钥！");
        return;
    }
    try
    {
        string pubkey = publickey.text;
        byte[] mw = asciiencoding.ascii.getbytes(mbox.text);
        rsacryptoserviceprovider crypt = new rsacryptoserviceprovider();
        crypt.fromxmlstring(pubkey);

        mw = crypt.encrypt(mw, false);
        string encryttext = convert.tobase64string(mw);//加密后的结果怎样处理解决显示乱码问题
        cbox.text = encryttext;
    }
    catch
    {
        messagebox.show("请检查是否打开公匙或者公匙是否损坏！");
    }
}

private void btdecoding_click(object sender, eventargs e)
{
    if (cbox.text == "")
    {
        messagebox.show("请生成密钥！");
        return;
    }
    try
    {
        rsacryptoserviceprovider crypt = new rsacryptoserviceprovider();
        byte[] bytes = convert.frombase64string(cbox.text);//从密文框中取出的字符串正确处理才能解密
        string prtkey = privatekey.text;
        crypt.fromxmlstring(prtkey);
        byte[] decryptbyte = crypt.decrypt(bytes, false);
        string decrypttext = encoding.default.getstring(decryptbyte);

        mbox.text = decrypttext;
    }
    catch (cryptographicexception ex)
    {
        //messagebox.show("请检查是否打开私匙或者私匙是否损坏！");
        messagebox.show(ex.tostring());
    } if (cbox.text == "")
    {
        messagebox.show("请生成密钥！");
        return;
    }
}