ช่วยดู ฟังชั้่น insert หน่อยครับ มัน ERRER ตรง ..cmd.ExecuteNonQuery();

private bool InsertDataUnit()
		{
			string DateTi = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
			string command = "insert into " +
				"long " +
				"(ID," +
				"NAME," +
				"LASTNAME," +
				"Data) " +
				"values " +
				"(''," +
				"'"+textBox1.Text+"'," +
				"'"+textBox2.Text+"'," +
				"'"+DateTi+"')" ;

			MySqlCommand cmd = new MySqlCommand(command , conn);
			
			cmd.ExecuteNonQuery();
			

			try
			{
				return true;
			}
			catch
			{
			return false;
			}
		}