C# SaveFileDialog +FileStream+StreamWriter 创建或者覆盖一个文件，并且写入

#region SaveFileDialog +FileStream+StreamWriter 
            SaveFileDialog savefiledialog1 = new SaveFileDialog();
            savefiledialog1.Filter = "文本文件|*.txt|Word文件|*.doc|Excel文件|*.xls";
            if (savefiledialog1.ShowDialog() == DialogResult.OK)
            {
                FileStream fs = new FileStream(savefiledialog1.FileName, FileMode.Create);
                StreamWriter sWriter = new StreamWriter(fs,Encoding.GetEncoding("GBK"));
                sWriter.WriteLine(savefiledialog1.FileName.ToString());               
                sWriter.WriteLine("hello Everyone\n");
                sWriter.Flush();
                sWriter.Close();
                fs.Close();
            }
#endregion