High Performance Question 202 of 215

How do you stream a large CSV from MVC?

ASP.NET MVC · Speak this in 60–90 seconds · Faridabad & Delhi NCR

URLRoute request

ViewBusiness logic

Model + TemplateData + HTML

Push rows to the response body incrementally with PushStream or PipeWriter style APIs.

Why interviewers care about Performance:

This is a process

question about Performance.

Panels listen for order,

trade-offs, and what you would actually do on a .NET MVC project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
Push rows to the
response body incrementally with PushStream or PipeWriter style APIs.
2
Buffering the whole file
kills memory.
3
How it works
Auth and timeouts still apply.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“Buffering the whole file kills memory.”

Break into beats

Bufferingthewholefilekillsmemory

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Push rows to the response body incrementally with PushStream or PipeWriter style APIs. Buffering the whole file kills memory.