namespace diaryBook
{
    public partial class Form1 : Form
    {
        //string time=DateTime.Now.ToString();//获取当前日期
        //string time = DateTime.Now.Hour.ToString();
        StreamWriter NewStream = null;
        FileStream NewFile = null;
        //string text = textBox1.Text;
        static string Y = DateTime.Now.Year.ToString();
        static string M = DateTime.Now.Month.ToString();
        static string D = DateTime.Now.Day.ToString();
        static string h = DateTime.Now.Hour.ToString();
        static string m = DateTime.Now.Minute.ToString();
        static string s = DateTime.Now.Second.ToString();
        static string time = Y + M + D + h + m + s;
        
        
        public Form1()
        {
            InitializeComponent();
        }        private void 写新日志ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            textBox1.Visible = true;
            textBox1.Text = "";
            string text = textBox1.Text;
            NewFile = new FileStream(@"F:\skk\aa" + time + ".txt ", FileMode.Create, FileAccess.Write);
            NewStream = new StreamWriter(NewFile);
            
        }        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string text = textBox1.Text;
            if(textBox1.Text != "")
            {
                string path = @"F:\skk\aa" + time + ".txt ";
                string InputText = textBox1.Text;
                File.WriteAllText(path, InputText);
            }             //NewStream.WriteLine(text);
            NewStream.Flush();
            //textBox1.Text = "";        }        private void 编辑ToolStripMenuItem_Click(object sender, EventArgs e)
        {            OpenFileDialog openFiledDialog = new OpenFileDialog();
            openFiledDialog.InitialDirectory = @"F:\skk\";
            openFiledDialog.Filter = "文本文件|*.*|C#文件|*.cs|所有文件|*.*";
            openFiledDialog.FilterIndex = 1;
            if (openFiledDialog.ShowDialog() == DialogResult.OK)
            {
                textBox1.Visible = true;
                textBox1.Text = ""; //进入编辑状态前,先将textBox中的内容清空,不然加载进来的文字会接着原来文字的后面。
                //打开文件对话框中选择的文件名
                string fname = openFiledDialog.FileName;
                //创建从字符串进行读取的StringReader对象
                StreamReader sr = File.OpenText(fname);
                string str;
                while ((str = sr.ReadLine()) != null)
                {
                    //将读出的字符串在textBox1中显示;
                    this.textBox1.Text += str;
                }
            }
        }        private void Form1_Load(object sender, EventArgs e)
        {        }        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            NewStream.Close();
            this.Close();
        }        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {        }
    }
}
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执行的是,在53行,即File.WriteAllText(path, InputText);处会报错。
说:“文件“F:\skk\aa2009717103057.txt”正由另一进程使用,因此该进程无法访问该文件。”
请问这个问题要如何解决?