saveFileDialog控件保存文件C#

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using System.IO;//必须添加命名空间。   窗口加载时要执行的内容：               saveFileDialog1.InitialDirectory = "D\\123.txt";//初始化文件保存的起始位置             saveFileDialog1.Filter = "文本文件(*.txt)|*.txt|Word97-2003文档(*.doc)|*.doc";//添加保存的类型             saveFileDialog1.FilterIndex=1;//类型索引             saveFileDialog1.FileName = "*.txt";//文件名称             saveFileDialog1.Title = "保存文件";//窗口标题   以下是按按钮事件执行的内容：    private void button1_Click(object sender, EventArgs e)         {             DialogResult dr = saveFileDialog1.ShowDialog();             if (dr == DialogResult.OK)             {                 FileStream fs = new FileStream(saveFileDialog1.FileName, FileMode.Append, FileAccess.Write);                 StreamWriter sw = new StreamWriter(fs, Encoding.Default);                 string str=richTextBox1.Text;                 string[] sp = str.Split('\n');                 foreach (var item in sp)                 {                     sw.WriteLine(item);                 }                 sw.Close();             }         }