How do I download a large file (via HTTP) in .NET?

Question

I need to download a large file (2 GB) over HTTP in a C# console application. Problem is, after about 1.2 GB, the application runs out of memory.

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Answer 1

You need to get the response stream and then read in blocks, writing each block to a file to allow memory to be reused.

As you have written it, the whole response, all 2GB, needs to be in memory. Even on a 64bit system that will hit the 2GB limit for a single .NET object.

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Update: easier option. Get WebClient to do the work for you: with its DownloadFile method which will put the data directly into a file.