Merge pull request #24 from mongodb-developer/add-dotnet-solutions

Added C# Solutions to Challenges section of WHERE.mdx

Author: LuceCarter

docs/40-CRUD/1-WHERE.mdx

@@ -113,6 +113,23 @@ Now, translate the following into a MongoDB query.
           ```
         </div>
     </TabItem>
+    <TabItem value="csharp" label="C#">
+      <div>
+        ```csharp
+        var booksWithTotalInventoryOf5 = Builders<Book>.Filter.Eq(b => b.TotalInventory, 5);
+
+        List<Book> filteredBooks = booksCollection.Find(booksWithTotalInventoryOf5).ToList<Book>();
+
+        if(filteredBooks != null)
+        {
+            foreach(var book in filteredBooks)
+            {
+                Console.WriteLine($"Book Title: {book.Title} - Total Inventory: {book.TotalInventory}");
+            }
+        }
+        ```
+      </div>
+    </TabItem>
   </Tabs>
 
 </details>
@@ -140,6 +157,23 @@ Now, translate the following into a MongoDB query.
           ```
         </div>
     </TabItem>
+    <TabItem value="csharp" label="C#">
+      <div>
+        ```csharp
+          var booksWithMoreThan300Pages = Builders<Book>.Filter.Gt(b => b.Pages, 300);
+
+          List<Book> filteredBooks = booksCollection.Find(booksWithMoreThan300Pages).ToList<Book>();
+
+          if(filteredBooks != null)
+          {
+              foreach(var book in filteredBooks)
+              {
+                  Console.WriteLine($"Book Title: {book.Title} - Pages: {book.Pages}");
+              }
+          }
+        ```
+      </div>
+    </TabItem>
   </Tabs>
 </details>
 
@@ -166,5 +200,21 @@ Now, translate the following into a MongoDB query.
           ```
         </div>
     </TabItem>
+    <TabItem value="csharp" label="C#">
+      <div>
+        ```csharp
+        var booksWithGenreScienceAndMoreThan300Pages = Builders<Book>.Filter.And(Builders<Book>.Filter.AnyEq(b => b.Genres, "Science"), Builders<Book>.Filter.Gt(b => b.Pages, 300));
+
+        var filteredBooks = booksCollection
+            .Find(booksWithGenreScienceAndMoreThan300Pages)
+            .ToList();
+
+        foreach (var book in filteredBooks)
+        {
+            Console.WriteLine($"{book.Title} - Pages: {book.Pages}");
+        }
+        ```
+      </div>
+    </TabItem>
   </Tabs>
 </details>