List methods (Add, Remove, Find, Sort) in C Sharp (C#) - Step-by-Step Execution

Concept Flow - List methods (Add, Remove, Find, Sort)

Start with empty list

↓

Add item

→List grows

↓

Remove item

→List shrinks if item found

↓

Find item

→Return item or default

↓

Sort list

→List rearranged in order

↓

End with updated list

This flow shows how a list starts empty, items are added, removed, found, and finally sorted, updating the list step-by-step.

Execution Sample

C Sharp (C#)

List<int> numbers = new List<int>();
numbers.Add(5);
numbers.Add(3);
numbers.Remove(5);
int found = numbers.Find(x => x == 3);
numbers.Sort();

This code adds numbers 5 and 3 to a list, removes 5, finds 3, and sorts the list.

Execution Table

Step	Operation	List State	Action Detail	Result/Output
1	Create list	[]	Empty list created	List is empty
2	Add(5)	[5]	Add 5 to list	5 added
3	Add(3)	[5, 3]	Add 3 to list	3 added
4	Remove(5)	[3]	Remove 5 from list	5 removed
5	Find(x == 3)	[3]	Search for 3	3 found
6	Sort()	[3]	Sort list ascending	List sorted
7	End	[3]	No more operations	Final list: [3]

💡 All operations completed, list updated accordingly.

Variable Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	After Step 5	After Step 6	Final
numbers	[]	[5]	[5, 3]	[3]	[3]	[3]	[3]
found	0	0	0	0	3	3	3

Key Moments - 3 Insights

Why does the list shrink after Remove(5)?

Because Remove(5) finds the item 5 in the list and deletes it, so the list changes from [5, 3] to [3] as shown in step 4 of the execution_table.

What happens if Find does not find the item?

Find returns the default value (null for reference types or default for value types). In this example, Find found 3 at step 5, but if it didn't, found would be 0.

Does Sort change the list size?

No, Sort only rearranges the items in the list without adding or removing any, as seen in step 6 where the list remains [3].

Visual Quiz - 3 Questions

Look at the execution_table at step 4, what is the list state after Remove(5)?

A [5, 3]

B [3]

C []

D [5]

💡 Hint

Check the 'List State' column at step 4 in the execution_table.

At which step does the variable 'found' get assigned a value?

A Step 5

B Step 2

C Step 3

D Step 6

💡 Hint

Look at the variable_tracker for 'found' and see when it changes from 0.

If we add numbers in reverse order and then call Sort(), what will happen to the list?

A List will be empty

B List will remain in reverse order

C List will be sorted ascending

D Sort will remove duplicates

💡 Hint

Refer to step 6 in execution_table where Sort rearranges the list.

Concept Snapshot

List methods in C#:
- Add(item): adds item to end
- Remove(item): removes first matching item
- Find(predicate): returns first matching item or default
- Sort(): sorts list in ascending order
List changes size on Add/Remove, but not on Find/Sort.

Full Transcript

This example shows how to use common List methods in C#. We start with an empty list. Adding items increases the list size. Removing an item deletes it if found, shrinking the list. Finding searches for an item and returns it if found. Sorting rearranges the list without changing its size. Each step updates the list state clearly, helping beginners see how these methods affect the list.