//Declaration part
string strExchSvrName = “”;
string strMailbox = “”;
string strCalendarUri = “”;
string strDomain = “”;
string strUserName = “”;
string strPassword = “”;
System.Net.HttpWebRequest WebDavRequest = null;
System.Net.HttpWebResponse WebDavResponse = null;
System.Net.CredentialCache MyCredentialCache = null;
byte[] bytes = null;
System.IO.Stream WebDavRequestStream = null;
// Provide the Exchange server name;
strExchSvrName = “mydomain.in”;
// Provide Mailbox folder name.
strMailbox = “Mailbox1”;
//if HTTPS -then provide URI of the user’s calendar folder
strCalendarUri = “https://” + strExchSvrName + “/exchange/”+ strMailbox + “/Calendar/”;
//if HTTP -then provide URI of the user’s calendar folder
//strCalendarUri = “http://” + strExchSvrName + “/exchange/” + strMailbox + “/Calendar/”;
//Provide the User name and password of appointment creator. Make sure the user has enough permissions to read
strUserName = “username”;
strDomain = “domain”;
strPassword = “password”;
//Build the Query
string query = “<?xml version=”1.0”?><D:searchrequest xmlns:D = “DAV:” >”
+ “<D:sql>SELECT “http://schemas.microsoft.com/exchange/outlookmessageclass”, “DAV:contentclass”,
“DAV:displayname” FROM “” + strCalendarUri + “””
+ “WHERE “DAV:ishidden” = true AND “DAV:isfolder” = false”
+ “</D:sql></D:searchrequest>”;
query = “<?xml version=”1.0″?>”
+ “<dav:searchrequest xmlns:dav=”DAV:”>”
+ “<dav:sql>”
+ “SELECT “
+ “”DAV:displayname”, “ // Appointment Uri portion of the resource
+ “”DAV:href”, “ // Full resource Uri of the appointment
+ “”urn:schemas:httpmail:subject”, “ // Subject of appointment
+ “”urn:schemas:calendar:dtstart”, “ // Start date/time of appointment
+ “”urn:schemas:calendar:dtend”, “ // End date/time of appointment
+ “”urn:schemas:httpmail:textdescription”, “ // Body of appointment
+ “”urn:schemas:calendar:location”, “ // Location of appointment
+ “”urn:schemas:calendar:alldayevent”, “ // Whether appointments an all day appointment
+ “”urn:schemas:calendar:meetingstatus”, “ // Confimed status of the appointment
+ “”urn:schemas:calendar:busystatus”, “ // Comitted status the appointment represents
+ “”http://schemas.microsoft.com/mapi/proptag/x823D0003”, “ // Color of the appointment
+ “”urn:schemas:calendar:reminderoffset”, “ // Reminder offset of the appointment
+ “”DAV:ishidden”, “ // Whether this is hidden
+ “”urn:schemas:calendar:instancetype”, “ // Relation of the appointment to a recurring series
+ “”urn:schemas:calendar:transparent”, “ // Transparency of the appointment to free/busy searches
+ “”urn:schemas:calendar:timezoneid” “ // Display timezone of the appointment
+ “FROM Scope(‘SHALLOW TRAVERSAL OF “” + strCalendarUri + “”‘) “
+ “WHERE “
+ “(“DAV:contentclass” = ‘urn:content-classes:appointment’ ) “ // Item is an appointment
+ “AND (NOT “urn:schemas:calendar:instancetype” = 1) “ // appointment is not the master of a recurring series (Get single
appointments or instances of recurring appointments)
+ “AND (“urn:schemas:calendar:dtend” > ‘” +
Convert.ToDateTime(“3-12-2007”).Date.ToUniversalTime().ToString(“yyyy/MM/dd HH:mm:ss”) + “‘)
“ //Appointment ends after the start of our range
+ “AND (“urn:schemas:calendar:dtstart” < ‘” +
Convert.ToDateTime(“3-17-2007”).Date.ToUniversalTime().ToString(“yyyy/MM/dd HH:mm:ss”) + “‘)
“ //Appointment begins before the end of our range
+ “AND (“DAV:displayname” like ‘” + “LS.ImportantDates.” + “%’ ) “
+ “ORDER BY “urn:schemas:calendar:dtstart” “
+ “</dav:sql>”
+ “</dav:searchrequest>”;
//Provide credentials required to access the server. Here i used the NTLM
MyCredentialCache = new System.Net.CredentialCache();
MyCredentialCache.Add(new System.Uri(strCalendarUri), “NTLM”, new System.Net.NetworkCredential(strUserName, strPassword, strDomain));
//Create the HttpWebRequest object.
WebDavRequest = (System.Net.HttpWebRequest)HttpWebRequest.Create(strCalendarUri);
// Add the network credentials to the request.
WebDavRequest.Credentials = MyCredentialCache;
// Specify the PROPPATCH method.
WebDavRequest.Method = “SEARCH”;
// Encode the body using UTF-8.
bytes = Encoding.UTF8.GetBytes(query);
// Set the content header length.
WebDavRequest.ContentLength = bytes.Length;
// Get a reference to the request stream.
WebDavRequestStream = WebDavRequest.GetRequestStream();
// Write the message body to the request stream.
WebDavRequestStream.Write(bytes, 0, bytes.Length);
// Release the connection
WebDavRequestStream.Close();
// Set the content type header.
WebDavRequest.ContentType = “text/xml”;
WebDavResponse = (System.Net.HttpWebResponse)WebDavRequest.GetResponse();
Response.Write(“Calendar : “);
Response.Write(“Status Code: “ + WebDavResponse.StatusCode + “Description: “ + WebDavResponse.StatusDescription);
using (System.IO.StreamReader streamReader = new System.IO.StreamReader(WebDavResponse.GetResponseStream()))
{ Response.Write(streamReader.ReadToEnd());
}
WebDavResponse.Close();
You can get more related samples and detailed information from Dan’s blog. For more information you can also refer this article .csharpcode, .csharpcode pre
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Issue: 
But make sure, that we don’t fell prey to complex calendaring by setting dispidRecurring property as TRUE along with WebDAV, like by doing, "<mapi:0x00008223 dt:dt=""boolean"">1</mapi:0x00008223>". This excerpt sets the MAPI property to 1 (TRUE) to create a recurring appointment. To create a non-recurring appointment, set this property to 0 (FALSE). As the complex calendaring is not supported with WebDAV, you can refer the 
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