namespace WindowsFormsApplication20
{
    public partial class Form1 : Form
    {
       
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (File.Exists(textBox1.Text))
            {
                StreamReader sr = new StreamReader(textBox1.Text,Encoding .Default  );
                textBox2.Text = sr.ReadToEnd();
                sr.Close();
            }
            else
                textBox2.Text = "文件不存在";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (File.Exists(textBox1.Text))
            {
                StreamWriter sw = new StreamWriter(textBox1.Text);
                sw.Write( textBox2.Text );
                sw.Close();
            }
            else
                textBox2.Text = "文件不存在";
        }
读出文件后在vs的textBox2中显示的乱码，麻烦问下该怎么解决啊？