Tag Archives: lists

Determine whether two lists contain the same sequences of objects in different orders in C#

The SequenceEqual method determines whether two IEnumerable sequences contain the same objects in the same order. There is a simple way to determine whether the lists contain the same objects in different orders: sort the objects and then call SequenceEqual. … Continue reading

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Determine whether two lists contain the same sequences of objects in C#

The IEnumerable interface provides a SequenceEqual method that determines whether two IEnumerable sequences contain the same objects. Normally, it uses reference equality so it considers two objects equal only if they refer to the same instance. However, if the objects … Continue reading

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List Dictionary keys and values in C#

A Dictionary object’s Keys property is a KeyCollection containing the dictionary’s keys. Similarly, its Values property is a ValueCollection containing the dictionary’s values. These collections are slightly different from the List objects that you probably use in your code. In … Continue reading

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Make an owner-drawn ListBox that justifies columns in C#

This example shows how you can use an owner-drawn ListBox to left and right align values in columns. The following examples show different ways to align values in columns. Draw aligned columns of data in C# Format values in a … Continue reading

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Draw aligned columns of data in C#

This example draws a series of rows with aligned columns either left or right justified. The program uses the following code to define the data it will draw and the row and column alignments. // The values. private string[][] Values … Continue reading

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Iterate over the items in arrays and lists in C#

You can use a foreach loop to iterate over the items in arrays, lists, collections, and other objects that have a GetEnumerator method. These loops are often more convenient than for or while loops because you don’t need to worry … Continue reading

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Display database records without data binding in C#

Many programs use data binding to display database records. That method is easy (at least as far as the code you write is concerned), but it’s not very flexible. This example shows how you can display database records without data … Continue reading

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Initialize lists from databases without binding in C#

Note that this is a very manual way to initialize lists. Often you can display data more easily by using data binding. In this example, I added the Access database file Books.mdb to the project and set its “Copy to … Continue reading

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Make a list without duplicates in C#

This example builds a list of Person objects without duplicates. The following code shows the Person class. public class Person : IEquatable<Person> { public string FirstName, LastName; public Person(string first_name, string last_name) { FirstName = first_name; LastName = last_name; } … Continue reading

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Move items between two ListBoxes in C#

One way to let the user select items from a list is to use a ListBox or a CheckedListBox. The user can Click, Ctrl+Click, Shift+Click, and user other keyboard and mouse combinations to select some of the items in the … Continue reading

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