advanced search method to search outlook sent items in c#

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C#

C#4.0

Hi all

I am searching outlook sent items using advanced search method
namespace using Outlook = Microsoft.Office.Interop.Outlook;

Outlook._NameSpace olNs;
Outlook.MAPIFolder oSents;
Outlook.Items oItems;
Outlook._Application OutlookApp = new Outlook.Application();
Outlook.Results advancedSearchResults = null;
Outlook.Search advancedSearch = null;

olNs = olApp.GetNamespace("MAPI");
oSents = olNs.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail);
string scope = "'" + oSents.FolderPath + "'";

string ToAddress= "prasanna@zqa.com";
string advancedSearchTag = "Our first advanced search in Outlook";
string filter = "urn:schemas:httpmail:to LIKE \'%" + ToAddress+ "%\'";

advancedSearch = OutlookApp.AdvancedSearch(scope, filter, false, advancedSearchTag);

advancedSearchResults = advancedSearch.Results;

for (int count = advancedSearchResults.Count; count >= 1; count--)
{
    try
    {
        oMICopy = (Outlook._MailItem)advancedSearchResults[count];
        sAddress = oMICopy.Recipients[1].Address.ToString();
    }
    catch
    {
        continue;
    }
 }      

But i am not getting any items from sentItems folder.
It is showing advancedSearchResults.Count=0
how to seach SentMailItems of outlook with to-mail address.