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GeneralRe: Trying to find the problem in this simple C$ program Pin
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QuestionDeleting items in group with a Condition [C#] Pin
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AnswerRe: Deleting items in group with a Condition [C#] Pin
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AnswerRe: Deleting items in group with a Condition [C#] Pin
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GeneralRe: Deleting items in group with a Condition [C#] Pin
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AnswerRe: Deleting items in group with a Condition [C#] Pin
BillWoodruff15-Mar-19 0:16
mveBillWoodruff15-Mar-19 0:16 
Either:

1. create a structured database, and bind the ListView to it.

or

2. create appropriate class objects and bind the ListView to a collection object class that maps to the ListView column structure.

There are lots of resources here: [^]

and, on the web: [^] to help you learn how to use databinding.

Once you have the ListView databound, then you either execute a command/query on the database, or you do something like this using Linq:
// assume 'Students is a List<Student>
IEnumerable<Student> earlydatestudents = Students.GroupBy(std => std.Group)
    .Select(grp =>
    {
        DateTime dt = grp.Min(s => s.DOB);
        return grp.Where(st => st.DOB == dt);
    })
    .SelectMany(slist => slist);

var toDeleteList = Students.Except(earlydatestudents).ToList();

// now delete or whatever
Note the above code will possibly return more than one student ... you could have students with the same birthdate in each group. You should implement IEquatable in your 'Student Class to do comparison based on more than just the birthdate (DOB) property.
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot


modified 15-Mar-19 23:34pm.

QuestionSending Json looking formatted plain text to be de-serialized. Pin
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Questionmultiple dropdown list in excel file Pin
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