Json parser null for list values

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Hi All

I have string in which i have 78 json assesment responce

string a='

[{"Assessments":[{"AssessmentID": "201", "AssessmentName": "Cardiac Cath Lab V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "23", "TimeLimit": "1380"},{"AssessmentID": "695", "AssessmentName": "Cardiac Progressive Care Exam A V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "75", "TimeLimit": "4500"},{"AssessmentID": "708", "AssessmentName": "Cardiac Progressive Care Exam B V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "75", "TimeLimit": "4500"},{"AssessmentID": "701", "AssessmentName": "CCU Exam A V4", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "73", "TimeLimit": "4380"},{"AssessmentID": "702", "AssessmentName": "CCU Exam B V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "68", "TimeLimit": "4080"},{"AssessmentID": "110", "AssessmentName": "Clinic V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "27", "TimeLimit": "1620"},{"AssessmentID": "606", "AssessmentName": "CNA Acute Care Exam A  V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "33", "TimeLimit": "1980"},{"AssessmentID": "607", "AssessmentName": "CNA Acute Care Exam B V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "33", "TimeLimit": "1980"},{"AssessmentID": "608", "AssessmentName": "CNA Acute Care Exam C V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "33", "TimeLimit": "1980"},{"AssessmentID": "181", "AssessmentName": "CNA-Dementia Care V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "180", "AssessmentName": "CNA-Disability Competency V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "14", "TimeLimit": "840"},{"AssessmentID": "179", "AssessmentName": "CNA-Hospice & Palliative Care V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "15", "TimeLimit": "900"},{"AssessmentID": "13", "AssessmentName": "CNA-LTC V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "1800"},{"AssessmentID": "211", "AssessmentName": "CNA-Sitter V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "21", "TimeLimit": "1260"},{"AssessmentID": "245", "AssessmentName": "Corrections-RN/LPN V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "396", "AssessmentName": "Critical Care - California V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "55", "TimeLimit": "3300"},{"AssessmentID": "697", "AssessmentName": "CVICU Exam A V3", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "74", "TimeLimit": "4440"},{"AssessmentID": "698", "AssessmentName": "CVICU Exam B V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "73", "TimeLimit": "4380"},{"AssessmentID": "65", "AssessmentName": "Diabetes Knowledge Quiz for RN/LPN V1", "AssessmentType": "Test", "CostPoints": "0.5", "NumberOfQuestions": "15", "TimeLimit": "900"},{"AssessmentID": "40", "AssessmentName": "Dialysis V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "935", "AssessmentName": "Dysrhythmia (Basic)_Interpretation Only_A V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "50", "TimeLimit": "3000"},{"AssessmentID": "941", "AssessmentName": "Dysrhythmia (Basic)_Interpretation Only_B V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "54", "TimeLimit": "3240"},{"AssessmentID": "282", "AssessmentName": "Dysrhythmia Exam V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "24", "TimeLimit": "1560"},{"AssessmentID": "938", "AssessmentName": "Dysrhythmia(Basic) Interpretation & Measurements_A V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "60", "TimeLimit": "5160"},{"AssessmentID": "930", "AssessmentName": "Dysrhythmia(Basic) Interpretation & Measurements_B", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "69", "TimeLimit": "5940"},{"AssessmentID": "621", "AssessmentName": "Endoscopy/GI Lab Exam A V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "50", "TimeLimit": "3000"},{"AssessmentID": "622", "AssessmentName": "Endoscopy/GI Lab Exam B V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "50", "TimeLimit": "3000"},{"AssessmentID": "933", "AssessmentName": "ER Exam A V3", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "63", "TimeLimit": "3780"},{"AssessmentID": "934", "AssessmentName": "ER Exam B V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "64", "TimeLimit": "3840"},{"AssessmentID": "629", "AssessmentName": "General ICU Exam A V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "62", "TimeLimit": "3720"},{"AssessmentID": "706", "AssessmentName": "General ICU Exam B V3", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "74", "TimeLimit": "4440"},{"AssessmentID": "38", "AssessmentName": "Geriatric LTC-Pharmacology V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "26", "TimeLimit": "1560"},{"AssessmentID": "892", "AssessmentName": "Geriatric-LTC V4", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "29", "TimeLimit": "1740"},{"AssessmentID": "45", "AssessmentName": "HHC-Clinical V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "46", "AssessmentName": "HHC-Medication V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "176", "AssessmentName": "HHC-Nasal/Tracheal Suction Exam V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "20", "TimeLimit": "1200"},{"AssessmentID": "177", "AssessmentName": "HHC-Pediatric Ventilator V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "283", "AssessmentName": "HHC-Ventilator Management V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "15", "TimeLimit": "900"},{"AssessmentID": "178", "AssessmentName": "HHC-Wound Care V1", "AssessmentType": "Test", "CostPoints": "0.75", "NumberOfQuestions": "19", "TimeLimit": "1140"},{"AssessmentID": "567", "AssessmentName": "IV Push Medications V3", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "16", "TimeLimit": "960"},{"AssessmentID": "155", "AssessmentName": "IV Therapy/Infusion V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "1800"},{"AssessmentID": "39", "AssessmentName": "Labor & Delivery V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "38", "TimeLimit": "2280"},{"AssessmentID": "126", "AssessmentName": "LPN/LVN Competency V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "37", "AssessmentName": "LPN/LVN Pharmacology V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "1800"},{"AssessmentID": "660", "AssessmentName": "Medical Surgical Exam A V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "55", "TimeLimit": "3300"},{"AssessmentID": "662", "AssessmentName": "Medical Surgical Exam B V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "55", "TimeLimit": "3300"},{"AssessmentID": "699", "AssessmentName": "Neuro ICU Exam A V3", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "70", "TimeLimit": "4260"},{"AssessmentID": "700", "AssessmentName": "Neuro ICU Exam B V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "72", "TimeLimit": "4320"},{"AssessmentID": "623", "AssessmentName": "Neuro Progressive Care Exam A V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "50", "TimeLimit": "3000"},{"AssessmentID": "624", "AssessmentName": "Neuro Progressive Care Exam B V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "50", "TimeLimit": "3000"},{"AssessmentID": "492", "AssessmentName": "Newborn Nursery V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "39", "TimeLimit": "2340"},{"AssessmentID": "885", "AssessmentName": "NF- Pediatric Home Care", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "40", "TimeLimit": "2400"},{"AssessmentID": "411", "AssessmentName": "NICU V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "33", "TimeLimit": "1980"},{"AssessmentID": "117", "AssessmentName": "NICU Pharmacology V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "21", "TimeLimit": "1260"},{"AssessmentID": "73", "AssessmentName": "Oncology V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "24", "TimeLimit": "1440"},{"AssessmentID": "61", "AssessmentName": "Operating Room V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "35", "TimeLimit": "2100"},{"AssessmentID": "386", "AssessmentName": "PACU V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "33", "TimeLimit": "1980"},{"AssessmentID": "927", "AssessmentName": "Pediatrics V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "38", "TimeLimit": "2460"},{"AssessmentID": "44", "AssessmentName": "PEDS Pharmacology V1", "AssessmentType": "Test", "CostPoints": "0.5", "NumberOfQuestions": "13", "TimeLimit": "780"},{"AssessmentID": "413", "AssessmentName": "Postpartum V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "1800"},{"AssessmentID": "18", "AssessmentName": "Psychiatric V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "24", "TimeLimit": "1440"},{"AssessmentID": "873", "AssessmentName": "RN - Advanced Math Ability (Piedmont)", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "5400"},{"AssessmentID": "872", "AssessmentName": "RN - Basic Math Ability (Piedmont)", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "5400"},{"AssessmentID": "808", "AssessmentName": "RN Advanced Math Ability Exam A", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "5400"},{"AssessmentID": "809", "AssessmentName": "RN Advanced Math Ability Exam B", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "5400"},{"AssessmentID": "802", "AssessmentName": "RN Basic Math Ability Exam A", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "5400"},{"AssessmentID": "803", "AssessmentName": "RN Basic Math Ability Exam B", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "30", "TimeLimit": "5400"},{"AssessmentID": "804", "AssessmentName": "RN Perceptual Ability Exam A", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "20", "TimeLimit": "1200"},{"AssessmentID": "805", "AssessmentName": "RN Perceptual Ability Exam B", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "20", "TimeLimit": "1200"},{"AssessmentID": "845", "AssessmentName": "RN Pharmacology Exam A V4", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "54", "TimeLimit": "3240"},{"AssessmentID": "846", "AssessmentName": "RN Pharmacology Exam B V3", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "62", "TimeLimit": "3780"},{"AssessmentID": "225", "AssessmentName": "RN/LPN Case Manager V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "20", "TimeLimit": "1200"},{"AssessmentID": "182", "AssessmentName": "RN/LPN-Dementia Care V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "25", "TimeLimit": "1500"},{"AssessmentID": "186", "AssessmentName": "RN/LPN-Hospice & Palliative Care V1", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "15", "TimeLimit": "900"},{"AssessmentID": "703", "AssessmentName": "Surgical ICU Exam A V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "72", "TimeLimit": "4320"},{"AssessmentID": "685", "AssessmentName": "Surgical ICU Exam B V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "75", "TimeLimit": "4500"},{"AssessmentID": "704", "AssessmentName": "Trauma ICU Exam A V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "73", "TimeLimit": "4380"},{"AssessmentID": "705", "AssessmentName": "Trauma ICU Exam B V2", "AssessmentType": "Test", "CostPoints": "1", "NumberOfQuestions": "72", "TimeLimit": "4320"}]}]

How can I get all these values into list right now i have declared an instance to save the list values but i am getting only first record that too null values