Unlike a List<> A HashSet is a List with no duplicate members. Because a HashSet is constrained to contain only unique entries, the internal structure is optimized for searching (compared with a list) – it is considerably faster Adding to a HashSet returns a boolean – false if addition fails due to already existing in […]
Let’s say you have a List of T. And there are Property1, Property2, Property3 in T. If you want to change the value of Property2 in T then you can use: var myList = List<T>; foreach (var item in myList) { item.Property2 = newValue; } or var myList = List<T>; myList.ForEach(x => x.Proprty2 = newValue); […]
pop(): Remove an item from the end of an array (returns the removed item) push(parameterToAdd): Add items to the end of an array (returns the new array length) shift(): Remove an item from the beginning of an array (returns the removed item) unshift(parameterToAdd): Add items to the beginning of an array (returns the new array […]
string myList = “9,3,12,43,2”; List<int> intList = myList.Split(‘,’).Select(int.Parse).ToList();
List<int> list = new List<int>() {1,2,3}; string.Join<int>(“,”, list) Join has generic overloads. It is so much easier to use it in that way to convert your list to the different types.
string sNumbers = “1,2,3,4,5”; var numbers = sNumbers.Split(‘,’).Select(Int32.Parse).ToList();
Let’s say we have this values in the database: num — 1 2 4 5 6 8 9 11 To Find the first missing value, we can use this: ;WITH CteRN AS( SELECT *, RN = num – ROW_NUMBER() OVER(ORDER BY num) FROM tbl ) SELECT TOP 1 num – RN FROM CteRN WHERE RN […]
dataTable.DefaultView.ToTable(true, “target_column”); first parameter in ToTable() is a boolean which indicates whether you want distinct rows or not. second parameter in the ToTable() is the column name based on which we have to select distinct rows. Only these columns will be in the returned datatable. If you need to get distinct based on two columns: dataTable.DefaultView.ToTable(boolean, params string[] columnNames)
You can check the example code:
drpList.Items.Insert(0, new ListItem(String.Empty, String.Empty)); drpList.SelectedIndex = 0;