关于RichTextBox 及 RTF格式文件的保存

C# Visual Studio 2005中RichTextBox保存文件为rtf格式

SaveFileDialog saveFile1 = new SaveFileDialog();
// Initialize the SaveFileDialog to specify the RTF extention for the file.
saveFile1.DefaultExt = "*.rtf";
saveFile1.Filter = "RTF Files|*.rtf";

// Determine whether the user selected a file name from the saveFileDialog.
if (saveFile1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
               saveFile1.FileName.Length > 0)
{
    // Save the contents of the RichTextBox into the file.
            richTextBox1.SaveFile(saveFile1.FileName);
} 

RichTextBox文本保存为WORD格式：

    private void button1_Click(object sender, System.EventArgs e)
        ...{//保存为WORD文件
            if(this.richTextBox1.Text=="")
                return;
            if(this.saveFileDialog1.ShowDialog()==DialogResult.Cancel)
                return;
            string FileName=this.saveFileDialog1.FileName;
            if(FileName.Length<1)
                return;
            FileName+=".doc";
            try
            ...{
                Word.ApplicationClass MyWord=new Word.ApplicationClass(); 
                Word.Document MyDoc;                
                Object Nothing=System.Reflection.Missing.Value; 
                MyDoc=MyWord.Documents.Add(ref Nothing,ref Nothing,ref Nothing,ref Nothing); 
                MyDoc.Paragraphs.Last.Range.Text=this.richTextBox1.Text; 
                object MyFileName=FileName;
                //将WordDoc文档对象的内容保存为DOC文档 
//                MyDoc.SaveAs(ref MyFileName,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing,ref Nothing); 
                //关闭WordDoc文档对象 
                MyDoc.Close(ref Nothing, ref Nothing, ref Nothing); 
                //关闭WordApp组件对象 
                MyWord.Quit(ref Nothing, ref Nothing, ref Nothing);         
                MessageBox.Show("WORD文件保存成功","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
            catch(Exception Err)
            ...{
                MessageBox.Show("WORD文件保存操作失败！"+Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
        }