Developer Web Site

 
This code is set up for a contact, but is easily adapted for any of the REST APIs that exist.
 
GET:
// Note: Remember to add using System.Net;
 
// Create LoginCreditials
CredentialCache LoginCredentials = new CredentialCache();
 
// Add a new credential for this account
LoginCredentials.Add(new Uri(https://api.constantcontact.com/ws/customers/USERNAME),
    // Set up URI for API site
    Basic, // Basic login type
    new NetworkCredential(APIKey + % + Username, // Set up API Username (APIKey%Username)
        Password)); // Password 
 
// Create WebRequest, this is a factory class with a static constructor
// You can not use new, all requests must be created with WebRequest.Create
WebRequest Request = WebRequest.Create(ContactURI); // URI for the GET 
 
// Set Request credentials
Request.Credentials = LoginCredentials;
 
// Send GET request
// Recast the response to HttpWebResponse for correct processing
// Place in a try block to ensure that any errors are caught
try
{
    HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
 
    // Process the Response as needed
    // This is a generic StreamReader to read the entire response in
    // GetResponseStream can be recast to any of the Stream types
    // Note: Remember to add using System.IO
    StreamReader Reader = new StreamReader(Response.GetResponseStream()); // Read the entire XML response to a string string
    XMLResponse = Response.StatusCode + + Response.StatusDescription + + Reader.ReadToEnd();
 
    // Close Reader
    Reader.Close();
 
    // Close the response to free up the system resources
    Response.Close();
 
    return XMLResponse;
}
 
catch (WebException e)
{
    // Get the web exception type, error number returned here
    return WebException: + e.Status + + e.Message;
}
 
catch (Exception e)
{
    // Get the exception type
    return Exception: + e.Message;
}
 
PUT:
// Note: Remember to add using System.Net;
// Create LoginCreditials
CredentialCache LoginCredentials = new CredentialCache();
 
// Add a new credential for this account
LoginCredentials.Add(new Uri(https://api.constantcontact.com/ws/customers/USERNAME),
 
    // Set up URI for API site
    Basic, // Basic login type
    new NetworkCredential(APIKey + % + Username, // Set up API Username (APIKey%Username)
        Password)); // Password 
 
// Create WebRequest
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(ContactURI);
 
// URI for the PUT 
// Set Request to be a PUT
Request.Method = PUT;
 
// Set the ContentType property.
Request.ContentType = application/atom+xml;
 
// Set Request credentials
Request.Credentials = LoginCredentials;
 
// Set up XML String for the PUT
// Long string with quotes, use an absolute string with literals
string XMLData = ;
 
// Set up the XML Document, application dependant 
// Convert XMLData to byteArray for posting
byte[] byteArray = Encoding.UTF8.GetBytes(XMLData);
 
// Send PUT request
// Recast the response to HttpWebResponse for easier processing
// Place in a try block to ensure that any errors are caught
try
{
 
    // Set the ContentLength portion of the header
    Request.ContentLength = byteArray.Length; string XMLResponse = Bytes to send: + byteArray.Length;
 
    // Create a stream for the PUT Request
    Stream streamRequest = Request.GetRequestStream();
 
    // Write the data to the stream.
    // Note: Remember to add using System.IO
    streamRequest.Write(byteArray, 0, byteArray.Length);
    streamRequest.Close();
    HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
 
    // Process the Response as needed
    // This is a generic StreamReader to read the entire response in
    // You can recast this as any type of stream derivative
    StreamReader Reader = new StreamReader(Response.GetResponseStream());
 
    // Read the entire XML response to a string
    // Note there may not be a XML response for a successful PUT
    XMLResponse += Response.StatusCode + + Response.StatusDescription + + Reader.ReadToEnd();
 
    // Close Reader
    Reader.Close();
 
    // Close the response to free up the system resources
    Response.Close();
    return XMLResponse;
}
catch (WebException e)
{
    // Get the web exception type and response code
    return WebException: + e.Status + With response: + e.Message;
}
catch (Exception e)
{
    // Get the exception type
    return Exception: + e.Message;
}
 
POST:
// Note: Remember to add using System.Net;
// Create LoginCreditials
CredentialCache LoginCredentials = new CredentialCache();
 
// Add a new credential for this account
LoginCredentials.Add(new Uri(https://api.constantcontact.com/ws/customers/USERNAME),
    // Set up URI for API site
    Basic, // Basic login type
    new NetworkCredential(APIKey + % + Username, // Set up API Username (APIKey%Username)
        Password)); // Password 
 
// Create WebRequest
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(ContactURI);
 
// URI for the POST 
// Set Request to be a POST
Request.Method = POST;
 
// Set the ContentType property.
Request.ContentType = application/atom+xml;
 
// Set Request credentials
Request.Credentials = LoginCredentials;
 
// Set up XML String for the POST
// Long string with quotes, use an absolute string with literals string or a StringBuilder
XMLData = ;
 
// Set up the XML Document, application dependant 
 
// Convert XMLData to byteArray for posting
byte[] byteArray = Encoding.UTF8.GetBytes(XMLData);
 
// Send POST request
// Recast the response to HttpWebResponse for easier processing
// Place in a try block to ensure that any errors are caught
try
{
 
    // Set the ContentLength portion of the header
    Request.ContentLength = byteArray.Length; string XMLResponse = Bytes to send: + byteArray.Length;
 
    // Create a stream for the POST Request
    // Note: Remember to add using System.IO
    Stream streamRequest = Request.GetRequestStream();
 
    // Write the data to the stream.
    streamRequest.Write(byteArray, 0, byteArray.Length);
    streamRequest.Close();
    HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
 
    // Process the Response as needed
    // This is a generic StreamReader to read the entire response in
    // You can recast this as any type of stream derivative
 
    StreamReader Reader = new StreamReader(Response.GetResponseStream());
 
    // Read the entire XML response to a string
    // Note there may not be a XML response for a successful POST
    XMLResponse += Response.StatusCode + + Response.StatusDescription + + Reader.ReadToEnd();
 
    // Close Reader
    Reader.Close();
 
    // Close the response to free up the system resources
    Response.Close();
 
    return XMLResponse;
}
catch (WebException e)
{
    // Get the web exception type and response code
    return WebException: + e.Status + With response: + e.Message;
}
 
catch (Exception e)
{
    // Get the exception type
    return Exception: + e.Message;
}
 
Please feel free to post comments, corrections or suggestions.