Insert语句

问：

问题是：：未处理System.Data.OleDb.OleDbException   HResult=-2147217900   Message=语法错误 (操作符丢失) 在查询表达式 '2014/12/1 0:00:00' 中。

public void add(string addselect){oledbconn = dataconn.getcon();oledbconn.Open();OleDbCommand cmd = new OleDbCommand(addselect, oledbconn);int x = (int)cmd.ExecuteNonQuery();if (x > 0){MessageBox.Show("添加信息成功！");}oledbconn.Close();}private void button1_Click(object sender, EventArgs e){if (textBox1.Text == "" || textBox2.Text == "")MessageBox.Show("登记编号或姓名不能为空！");else{string st1 = dateTimePicker1.Value.Date.ToString();string inSQL = String.Format("insert into dingfang(登记编号,姓名,性别,身份证号,联系方式,房间类型,房间号,入住天数,登记日期) values({0},{1},{2},{3},{4},{5},{6},{7},{8})", textBox1.Text, textBox2.Text, comboBox3.Text, textBox3.Text, textBox4.Text, comboBox1.Text, comboBox2.Text, textBox5.Text, st1);dataoperate.add(inSQL);dataoperate.SaveImage(textBox1.Text.Trim(), openFileDialog1);}}

答：

string inSQL = String.Format("insert into dingfang(登记编号,姓名,性别,身份证号,联系方式,房间类型,房间号,入住天数,登记日期) values({0},{1},{2},{3},{4},{5},{6},{7},{8})", textBox1.Text, textBox2.Text, comboBox3.Text, textBox3.Text, textBox4.Text, comboBox1.Text, comboBox2.Text, textBox5.Text, st1);

大家特别注意对字符串的''号