เรื่อง ID ใน mysql คับ C# win app รบกวนสอบถามเรื่อง ID ใน mysql หน่อยครับ

private void InsertDataUnit()
		{
			string DateTi = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
			
			
			
			
			if(ChkUnitCount(txUnitNOScan.Text) == true)
			{
				string command = "insert into " +
					"tbl_combination_unit " +
					"(ID," +
					"UNIT_ID," +
					"PRONO," +
					"PROCODE," +
					"LINE_NAME," +
					"MODEL," +
					"REC_DATE," +
					"FLAG) " +
					"values " +
					"(''," +
					"'"+txUnitNOScan.Text+"'," +
					"'"+lbProno.Text+"'," +
					"'"+lbProcode.Text+"'," +
					"'"+lbLine.Text+"'," +
					"'"+lbModel.Text+"'," +
					"'"+DateTi+"'," +
					"'0') ";