ComputeFileHash.cs

void Main()
{
	var fileName = @"C:\OfficeDocs\somfile.js";
	var hash = GetFileHash(fileName);
	hash.Dump("Hash");
}

// Define other methods and classes here
public static string GetFileHash(string filePath)
{
	using (FileStream stream = File.OpenRead(filePath))
	{
		var sha = new SHA256CryptoServiceProvider();
		byte[] hash = sha.ComputeHash(stream);
		return BitConverter.ToString(hash).Replace("-", String.Empty);
	}
}