C# 按鍵保存txt文本

using System.IO;

System.Windows.Forms.SaveFileDialog objSave = new System.Windows.Forms.SaveFileDialog();
objSave.Filter = "(*.txt)|*.txt|" + "(*.*)|*.*";

objSave.FileName = "文件" + DateTime.Now.ToString("yyyyMMddHHmm") + ".txt";

if (objSave.ShowDialog() == DialogResult.OK)
  {
         StreamWriter FileWriter = new StreamWriter(objSave.FileName, true); //寫文件

          FileWriter.Write(this.txtDetail.Text);//將字元串寫入
          FileWriter.Close(); //關閉StreamWriter對象
}