How to assign values or set and get property value using reflection or dynamic property in c#

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C#

public List<StudentInfo> studentinfos;

public List<StudentInfo> StudentInfos
        {
            get
            {
                return studentinfos;
            }
            set
            {
                studentinfos = value;
                this.RaisePropertyChanged("StudentInfo");
            }
        }

public class StudentInfo
{
public int stuId{get;set;}
public string stuName{get;set;}
public int subId{get;set;}
public int subMark{get;set;}
public string subName{get;set;}
}


public void RowSelectedItem()
        {
            if (selecteddashitem != null)
            {
                List<StudentInfo> studentList = new List<StudentInfo>();
                foreach (var cell in selecteddashitem.Cells)
                {
                    foreach (var student in cell.Students)
                    {
                       studentList.Add(new StudentInfo
                       {
                           stuId=cell.stuId,
                           stuName = cell.Name,
                           subId=student.subId,
                           subMark = student.Mark,
			   subName=student.SubName
                       });       
                    }
                }
                StudentInfos = studentList;
            }
        }

=====

Hi I have individual value of every cell

I have three student(That is cell)

stuId
stuName

and every cell have three subject(sub1,sub2,sub3)

subId,
subMark,
subname

=====

The values are stored StudentInfos list based on stuid,stuname,subid and submark

sample result is

stuid=1
stuname=smith
subid=0
subname=eng
submark=10

stuid=1
stuname=smith
subid=1
subname=eng1
submark=20

stuid=1
stuname=smith
subid=2
subname=eng2
submark=30

Now i want how to assgin submark using stuid and where to create variable or class or list for (submark0,submark1,submark2)?

submark0=10
submark1=20
submark2=30