打开文件，保存文件

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private void ShowNewForm(object sender, EventArgs e)       {           Form childForm = new Form();           childForm.MdiParent = this;           childForm.Text = "窗口 " + childFormNumber++;           childForm.Show();       }         private void OpenFile(object sender, EventArgs e)       {           OpenFileDialog openFileDialog = new OpenFileDialog();           openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);           openFileDialog.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";           if (openFileDialog.ShowDialog(this) == DialogResult.OK)           {               string FileName = openFileDialog.FileName;           }       }         private void SaveAsToolStripMenuItem_Click(object sender, EventArgs e)       {           SaveFileDialog saveFileDialog = new SaveFileDialog();           saveFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);           saveFileDialog.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";           if (saveFileDialog.ShowDialog(this) == DialogResult.OK)           {               string FileName = saveFileDialog.FileName;           }       }