用文件判断用户输入

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string path = @"G:/test.txt";
        private bool HasID1(string tmp, string[] tmplist)
        {
            string tmp1;
            for (int i = 0; i < tmplist.Length; i++)
            {
                tmp1 = tmplist[i].ToString();

if (tmp1 == tmp)
{

                    return true;
                }
            }
            return false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            StringBuilder tmpsb = new StringBuilder();
            string tmpstring = "";
            string tmp = "";
            string[] tmplist ={ };
            if (!File.Exists(path))
            {

                StreamWriter sw = File.CreateText(path);
                sw.Close();
                MessageBox.Show("文件已创建");
            }
            else
            {

StreamReader sr1 = File.OpenText(path);

                    tmpstring = sr1.ReadLine();
                    if (tmpstring != null)
                    {
                        tmplist = tmpstring.Split('/t');
                    }

                    if (HasID1(tbID.Text, tmplist))
                    {
                        MessageBox.Show("当前用户编号已存在");
                    }
                    else
                    {
                        if (tbID.Text != null)
                        {
                            tmpsb.Append(tbID.Text + "/t");

                        }
                        tmpstring += tmpsb.ToString();
                        sr1.Close();
                        StreamWriter sw1 = File.CreateText(path);

sw1.WriteLine(tmpstring);

sw1.Close();

                        MessageBox.Show("当前用户编号已保存");
                    }
                }

}