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   源码介绍

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 private void button1_Click(object sender, EventArgs e)
        {
            //打开文件
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.InitialDirectory = "C: \\Users\\pc\\Desktop\\";
            openFileDialog.Filter = "txt files   (*.txt)|*.txt"; ;
            openFileDialog.RestoreDirectory = true;
            openFileDialog.FilterIndex = 1;
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = openFileDialog.FileName;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Stream myStream;
            SaveFileDialog saveFileDialog1 = new SaveFileDialog();
            saveFileDialog1.FileName = "开票文件";//另存的文件默认名称
            saveFileDialog1.Filter = "txt files   (*.txt)|*.txt";//另存的类型
            //saveFileDialog1.FilterIndex = 2;
            //saveFileDialog1.RestoreDirectory = true;            
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                if ((myStream = saveFileDialog1.OpenFile()) != null)
                {
                    using (StreamWriter sw = new StreamWriter(myStream))
                    {
                        sw.Write("this is the text");
                    }
                    myStream.Close();
                    MessageBox.Show("Saved");
                }
            }
        }