docs(dotnet): Request Examples (#6560)

docs/src/api/class-request.md

@@ -39,6 +39,13 @@ page.onRequestFailed(request -> {
 page.on("requestfailed", lambda request: print(request.url + " " + request.failure))
 ```
 
+```csharp
+page.RequestFailed += (_, request) =>
+{
+    Console.WriteLine(request.Failure);
+};
+```
+
 ## method: Request.frame
 - returns: <[Frame]>
 
@@ -109,6 +116,11 @@ response = page.goto("http://example.com")
 print(response.request.redirected_from.url) # "http://example.com"
 ```
 
+```csharp
+var response = await page.GoToAsync("http://www.microsoft.com");
+Console.WriteLine(response.Request.RedirectedFrom?.Url); // http://www.microsoft.com
+```
+
 If the website `https://google.com` has no redirects:
 
 ```js
@@ -131,6 +143,11 @@ response = page.goto("https://google.com")
 print(response.request.redirected_from) # None
 ```
 
+```csharp
+var response = await page.GoToAsync("https://www.google.com");
+Console.WriteLine(response.Request.RedirectedFrom?.Url); // null
+```
+
 ## method: Request.redirectedTo
 - returns: <[null]|[Request]>
 
@@ -150,6 +167,10 @@ System.out.println(request.redirectedFrom().redirectedTo() == request); // true
 assert request.redirected_from.redirected_to == request
 ```
 
+```csharp
+Console.WriteLine(request.RedirectedFrom?.RedirectedTo == request); // True
+```
+
 ## method: Request.resourceType
 - returns: <[string]>
 
@@ -217,6 +238,12 @@ request = request_info.value
 print(request.timing)
 ```
 
+```csharp
+var requestFinishedTask = page.WaitForEventAsync(PageEvent.RequestFinished);
+await Task.WhenAll(requestFinishedTask, page.GoToAsync("https://www.microsoft.com"));
+Console.WriteLine(requestFinishedTask.Result.Timing.ResponseEnd);
+```
+
 ## method: Request.url
 - returns: <[string]>