Bulk contact delete/add from the list

Regular Participant

Bulk contact delete/add from the list

Hi there,

Here I am listing partial code for the contact lists removal from the activity but I'm a getting

The remote server returned an error: (415) Unsupported Media Type.

Here is the code as follows


oRequest = null;HttpWebRequest)LoginCredReq("https://api.constantcontact.com/ws/customers/coolantu/lists");"multipart/form-data; boundary=" + PostData.boundary;"POST";PostData pData = new PostData();Encoding encoding = Encoding.UTF8;Stream oStream = null;new PostDataParam("activityType", "CLEAR_CONTACTS_FROM_LISTS", PostDataParamType.Field));new PostDataParam("lists", "http://api.constantcontact.com/ws/customers/coolantu/lists/1", PostDataParamType.Field));// pData.Params.Add(new PostDataParam("fileupload", "filename.txt", "filecontents" PostDataParamType.File));



oRequest.ContentLength = buffer.Length;

oStream = oRequest.GetRequestStream();

oStream.Write(buffer, 0, buffer.Length);



byte[] buffer = encoding.GetBytes(pData.GetPostData());HttpWebResponse oResponse = (HttpWebResponse)oRequest.GetResponse();

oRequest = (

oRequest.ContentType =

oRequest.Method =








Regular Participant


I am currently reviewing your provided code and will get back to you shortly.

Andrew T

Support Engineer, Constant Contact

Regular Participant

Hi Andrew,

Sorry for the post I already resolved the issue. But I'm experiening a new issue which I already posted as new forum it's adding contact(s) to the list in activity.It's giving me WebException:ProtocolErrorThe remote server returned an error: (400) Bad Request.

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