basic file I/O issue

I have a text file that is just a list of integers separated by a
space. In C++ I could do something like:

ifstream fin("filename.txt");

int x, y, z;
fin >> x >> y >> z;

to read the integers in.

How do I do that in C# with .NET IO?

Do I have to just read it all in as a giant string and then parse the
string?

.

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