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using System;
using System.Linq;
using System.Collections.Generic;
 
static class Test
{
   public static void Main()
	{
		int[] art = new int[] {11, 2, 8, 15};
		int name;
		name =  Convert.ToInt32(Console.ReadLine());
	  //  int k = art.indexOf(name);
	    foreach (int name in art)
{
    Console.WriteLine(name);
}
 
	 //   var hash = new HashSet<int>(art);
//if (hash.Contains(art))
//{
 //   Console.WriteLine(int.Format("Число '" + name + "' содержится в массиве"));
 //   //...
//}
	}
}

prog.cs(13,19): error CS0136: A local variable named `name' cannot be declared in this scope because it would give a different meaning to `name', which is already used in a `parent or current' scope to denote something else
Compilation failed: 1 error(s), 0 warnings

Standard output is empty