Download File from Internet using .NET

The WebClient class provides common methods for sending data to and receiving data from any local, intranet, or internet resource identified by a URI.

Namespace: System.Net

Assembly: System (in system.dll)

The DownloadFile method of this class downloads data from a resource to a local file.

Snippet:

WebClient client = new WebClient()
client.DownloadFile(source, destination);

eg:
source - http://www.whitelines.nl/html/google-page-rank.xls
destination - C:\GooglePageRank.xls

Note: By default, the .NET Framework supports URIs that begin with http:, https:, ftp:, and file: scheme identifiers.

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