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using System;
using System.Linq;
 
public class Test
{
	public static void Main()
	{
		object[] test = new object[5];
		test[0] = "Hello,Ken";
		test[1] = 3.1415;
		test[2] = "Hello,Taro";
		test[3] = "Hi,Yoko";
		test[4] = 27182;
 
		var hellos = 
		  test
		  	.Where(o => o.Contains("Hello"))
		  	.Select(o => o.ToString())
		  	;
//			.Where(o => o != null)
//			.Select(o => o.ToString())
//			.Where(o => o.Contains("Hello"))
//			;
 
		foreach(var hello in hellos) {
			Console.WriteLine(hello);
		}
	}
}

prog.cs(17,20): error CS1929: Type `object' does not contain a member `Contains' and the best extension method overload `System.Linq.ParallelEnumerable.Contains<string>(this System.Linq.ParallelQuery<string>, string)' requires an instance of type `System.Linq.ParallelQuery<string>'
/usr/lib/mono/4.5/System.Core.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty