Can I Still Get the Source Code?

I have a program that I run in C# that goes to a website and in order to do its functions, I need to get the source code of the page.

Code:

---

System.Net.WebClient webClient = new System.Net.WebClient();
string strSource = webClient.DownloadString(URL);
webClient.Dispose();
return strSource;

---

Very recently, some of the pages return a [] character while others return the full source code of the page. When I go to the pages outside of my programming, the source code can be seen just as they should.

Why would this be happening and is there a way around this?

I woudl try to download the data with WebClient.DownloadData() method and than labore with Encoding.(...).GetString() to get the source code of the page as string.
From MSDN:

Code:

---

Console.Write("\nPlease enter a URI (for example, http://www.contoso.com): ");
string remoteUri = Console.ReadLine();

// Create a new WebClient instance.
WebClient myWebClient = new WebClient();
// Download home page data.
Console.WriteLine("Downloading " + remoteUri);                       
// Download the Web resource and save it into a data buffer.
byte[] myDataBuffer = myWebClient.DownloadData (remoteUri);

// Display the downloaded data.
string download = Encoding.ASCII.GetString(myDataBuffer);
Console.WriteLine(download);

---