Efficient way to combine multiple text files

Question

I have multiple files of text that I need to read and combine into one file. The files are of varying size: 1 - 50 MB each. What's the most efficient way to combine these files without bumping into the dreading System.OutofMemoryException?

Answer 1

Darin is on the right track. My tweak would be:

using (var output = File.Create("output"))
{
    foreach (var file in new[] { "file1", "file2" })
    {
        using (var input = File.OpenRead(file))
        {
            input.CopyTo(output);
        }
    }
}