Moderate ASP.NET Question 64 of 215

How do you return file downloads from an API?

.NET / C# · Speak this in 60–90 seconds · Faridabad & Delhi NCR

01234

Index starts at 0. Scan once for max — O(n).

I return FileStreamResult or Results.File with the right content type and content-disposition.

Why interviewers care about ASP.NET:

This is a process

question about ASP.NET.

Panels listen for order,

trade-offs, and what you would actually do on a .NET 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
I return FileStreamResult or
Results.File with the right content type and content-disposition.
2
Streaming beats loading huge
files into byte arrays.
3
Auth checks happen before
opening the stream.
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

“Streaming beats loading huge files into byte arrays.”

Break into beats

Streamingbeatsloadinghugefilesinto

Speaking order

2987408337471632900

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

I return FileStreamResult or Results.File with the right content type and content-disposition. Streaming beats loading huge files into byte arrays.