Enable more interactive examples for System.Random (#3778)

Author: mairaw

xml/System/Random.xml

@@ -194,15 +194,15 @@ To avoid this problem, create a single <xref:System.Random> object instead of mu
  You can retrieve integers in a specified range by calling the <xref:System.Random.Next%28System.Int32%2CSystem.Int32%29> method, which lets you specify both the lower and the upper bound of the numbers you'd like the random number generator to return. The upper bound is an exclusive, not an inclusive, value. That is, it isn't included in the range of values returned by the method. The following example uses this method to generate random integers between -10 and 10. Note that it specifies 11, which is one greater than the desired value, as the value of the `maxValue` argument in the method call.  
   
  [!code-cpp[System.Random#15](~/samples/snippets/cpp/VS_Snippets_CLR_System/system.Random/cpp/range1.cpp#15)]
- [!code-csharp[System.Random#15](~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Random/cs/range1.cs#15)]
+ [!code-csharp-interactive[System.Random#15](~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Random/cs/range1.cs#15)]
  [!code-vb[System.Random#15](~/samples/snippets/visualbasic/VS_Snippets_CLR_System/system.Random/vb/range1.vb#15)]  
   
 <a name="Digits"></a>   
 ### Retrieve integers with a specified number of digits  
  You can call the <xref:System.Random.Next%28System.Int32%2CSystem.Int32%29> method to retrieve numbers with a specified number of digits. For example, to retrieve numbers with four digits (that is, numbers that range from 1000 to 9999), you call the <xref:System.Random.Next%28System.Int32%2CSystem.Int32%29> method with a `minValue` value of 1000 and a `maxValue` value of 10000, as the following example shows.  
   
  [!code-cpp[System.Random#16](~/samples/snippets/cpp/VS_Snippets_CLR_System/system.Random/cpp/range2.cpp#16)]
- [!code-csharp[System.Random#16](~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Random/cs/range2.cs#16)]
+ [!code-csharp-interactive[System.Random#16](~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Random/cs/range2.cs#16)]
  [!code-vb[System.Random#16](~/samples/snippets/visualbasic/VS_Snippets_CLR_System/system.Random/vb/range2.vb#16)]  
   
 <a name="Floats"></a>   
@@ -244,7 +244,7 @@ Random.NextDouble() * (maxValue - minValue) + minValue
  Instead of creating a separate class to generate random <xref:System.Boolean> values, the example could simply have defined a single method. In that case, however, the <xref:System.Random> object should have been defined as a class-level variable to avoid instantiating a new <xref:System.Random> instance in each method call. In Visual Basic, the Random instance can be defined as a [Static](~/docs/visual-basic/language-reference/modifiers/static.md) variable in the `NextBoolean` method.  The following example provides an implementation.  
   
  [!code-cpp[System.Random#20](~/samples/snippets/cpp/VS_Snippets_CLR_System/system.Random/cpp/booleans2.cpp#20)]
- [!code-csharp[System.Random#20](~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Random/cs/booleans2.cs#20)]
+ [!code-csharp-interactive[System.Random#20](~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Random/cs/booleans2.cs#20)]
  [!code-vb[System.Random#20](~/samples/snippets/visualbasic/VS_Snippets_CLR_System/system.Random/vb/booleans2.vb#20)]  
   
 <a name="Long"></a>