The remote server returned an error: (417) Expectation failed is solved

what is Expect100Continue Property        According to w3.org  The purpose of the 100 (Continue) status  is to allow a client that is sending a request message with a request body to determine if the origin server is willing to accept the request (based on the request headers) before the client sends the request body. In some cases, it might either be inappropriate or highly inefficient for the client to send the body if the server will reject the message without looking at the body. more details about 100 continue property I got this error when try to call web method in c#. So finally I salved this error by applying following things. Adding following statement right before calling web method  System.Net.ServicePointManager.Expect100Continue = false. 2. Adding following section in web.config inside <configuration> <settings> <servicePointManager expect100Continue=”false” /> </settings> more detail on MSDN