fix compilation errors

Author: xoposhiy

src/courses/Linq/Slides/02-ReadNumbersExcercise.cs

@@ -87,21 +87,21 @@ public void Trash()
 			var b = 1;
 		}
 
-		//[Exercise(SingleStatement = true)]
-		//[Hint("`int.Parse` преобразует строку в целое число.")]
-		//public int[] ParseNumbers(IEnumerable<string> lines)
-		//{
-		//	return lines
-		//		.Where(line => line != "")
-		//		.Select(int.Parse)
-		//		.ToArray();
-		//	/*uncomment
-		//	return lines
-		//		.Where(...)
-		//		.Select(...)
-		//		...
-		//	*/
-		//}
+		[Exercise(SingleStatement = true)]
+		[Hint("`int.Parse` преобразует строку в целое число.")]
+		public int[] ParseNumbers(IEnumerable<string> lines)
+		{
+			return lines
+				.Where(line => line != "")
+				.Select(int.Parse)
+				.ToArray();
+			/*uncomment
+			return lines
+				.Where(...)
+				.Select(...)
+				...
+			*/
+		}
 
 
 

src/uLearn.Web/Views/Course/Slide.cshtml

@@ -31,8 +31,8 @@
 				<textarea class='code code-exercise'>@slide.Exercise.Text</textarea>
 
 				<text>Ожидаемый вывод на консоль:</text>
-				<pre class="expected-output"><code>@slide.ExpectedOutput</code></pre>
-				<pre class="actual-output"><code>@Model.ActualExerciseOutput</code></pre>
+				<pre class="expected-output"><code>@slide.ExpectedOutput</code></pre>
+				<pre class="actual-output"><code>@Model.ActualExerciseOutput</code></pre>
 				@Html.Partial("_ExerciseHints", slide.HintsHtml)
 			}
 

src/uLearn/CSharp/SlideWalker.cs

@@ -36,7 +36,6 @@ public override void Visit(SyntaxNode node)
 				Head += u;
 			}
 			Head += "namespace u \n{\n public class S\n {\n }}";
-			"/^**^*/"
 		}
 
 		public override void VisitClassDeclaration(ClassDeclarationSyntax node)