how can i create the utility page to test the HttpWebRequest respone

I need to test the request.response on a page, my response will cone into below format
{"id":"PbFSbmbx3AwtkwuZwqQ3ag","url":"https://bitpay.com/invoice?id=PbFSbmbx3AwtkwuZwqQ3ag","posData":"12345","status":"confirmed","btcPrice":"0.0013","price":1,"currency":"EUR","invoiceTime":1386273254047,"expirationTime":1386274154047,"currentTime":1386273276649}
But when I sue the below code to test it then It show secial chracter array.

string responseString = @"{\""id\"":\""PbFSbmbx3AwtkwuZwqQ3ag\"",\""url\"":\""https://bitpay.com/invoice?id=PbFSbmbx3AwtkwuZwqQ3ag\"",""\""posData\"":\""1149940033\ ...