Check if a given string contains a valid URL without the usage of messy RegEx expressions.

Of course you can include or exclude more Uri.Schemas as you like/need.
See the full list reference in the MSDN documetation.

using System;
using System.Text.RegularExpressions;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine(IsValidUrl("http://www.wolfsys.net"));
		Console.WriteLine(IsValidUrl("https://wolfsys.net"));
		Console.WriteLine(IsValidUrl("https://www.wolfsys.net"));
		Console.WriteLine(IsValidUrl("https://www.wolfsys"));
		Console.WriteLine(IsValidUrl("//www.wolfsys.net"));
		Console.WriteLine(IsValidUrl(".wolfsys.net"));
		Console.WriteLine(IsValidUrl("wolfsys.net"));
		Console.WriteLine(IsValidUrl("ftp://wolfsys.net/download/x.zip"));
	}
	
	public static bool IsValidUrl(string url)
	{
		Uri uri;
		if (Uri.TryCreate(url, UriKind.Absolute, out uri) == false)
		{
			return false;
		}
		return uri.Scheme == Uri.UriSchemeHttp || 
				uri.Scheme == Uri.UriSchemeHttps || 
				uri.Scheme == Uri.UriSchemeFtp;
	}
}