Linq query to get the distinct values in a list

Question

Suppose this is my member class

class Member 
{
    public string CategoryId { get; set; }
    public string MemberName { get; set; }
    public int Distance { g         


        

Answer 1

class Member {
    public string CategoryId {get; set;}
    public string MemberName{get; set;}
    public int Distance{get; set;}
}

var list = new List<Member>();
list.Add(new Member{ CategoryId = "01", MemberName="andy", Distance=3});
list.Add(new Member{ CategoryId = "02", MemberName="john", Distance=5});
list.Add(new Member{ CategoryId = "01", MemberName="mathew", Distance=7});
list.Add(new Member{ CategoryId = "03", MemberName="bakara", Distance=2});

var query = list.GroupBy(member => member.CategoryId).Select(x=>x.OrderBy(y=>y.Distance).First());