What is the difference between FileStream and MemoryStream?

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Ravi Vishwakarma · Answer

FileStream and MemoryStream are both part of the .NET System.IO namespace, and while they both inherit from Stream, they serve very different purposes. FileStream vs MemoryStream Feature FileStream MemoryStream Storage Medium Interacts with a file on disk Uses memory (RAM) as the data store Performance Slower (disk I/O latency) Faster (memory access) Persistence Persistent (data remains after app closes) Volatile (data lost when app exits or disposed) Use Cases Reading/writing files, file-based logs, etc. In-memory data processing, temp buffers, etc. Constructors Requires file path or handle Uses byte arrays or default in-memory buffer Requires Cleanup Yes — can lock file until disposed Yes — disposes RAM used by buffer Examples FileStream Example (write to disk): MemoryStream Example (write to memory): When to Use Use FileStream when: You need to read/write actual filesYou want persistent storageYou're working with large files that don’t fit into memory Use MemoryStream when: You want fast, temporary in-memory processingYou're working with byte arrays, serialization, or image manipulationYou want to avoid disk I/O for performance

What is the difference between FileStream and MemoryStream?

1 Answers

`FileStream` vs `MemoryStream`

Examples

FileStream Example (write to disk):

MemoryStream Example (write to memory):

When to Use

Use `FileStream` when:

Use `MemoryStream` when:

Feature	`FileStream`	`MemoryStream`
Storage Medium	Interacts with a file on disk	Uses memory (RAM) as the data store
Performance	Slower (disk I/O latency)	Faster (memory access)
Persistence	Persistent (data remains after app closes)	Volatile (data lost when app exits or disposed)
Use Cases	Reading/writing files, file-based logs, etc.	In-memory data processing, temp buffers, etc.
Constructors	Requires file path or handle	Uses byte arrays or default in-memory buffer
Requires Cleanup	Yes — can lock file until disposed	Yes — disposes RAM used by buffer

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What is the difference between FileStream and MemoryStream?

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1 Answers

FileStream vs MemoryStream

Examples

FileStream Example (write to disk):

MemoryStream Example (write to memory):

When to Use

Use FileStream when:

Use MemoryStream when:

`FileStream` vs `MemoryStream`

Use `FileStream` when:

Use `MemoryStream` when: