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My C# WPF webscraper returns error when more than one result is found

I am working on a WPF XAML application that scrapes certain websites for products. I have the search part working and it finds what I'm looking for. But as soon as there is more then 1 result I get a System.InvalidoperationException. I use a ObservableCollection to put the results into a <ListBox>.
Here is the search method:
private static ObservableCollection<EntryModel> _entries = new ObservableCollection<EntryModel>();
public static ObservableCollection<EntryModel> LoadCollectionData
{
get { return _entries; }
set { _entries = value; }
}
public static void PrehmSearchResults(string SearchQuery)
{
HtmlWeb web = new HtmlWeb();
try
{
string ZoekOpdracht = SearchQuery.Replace(" ", "+");
HtmlDocument doc = web.Load("https://www.prehmshop.de/advanced_search_result.php?keywords=" + ZoekOpdracht);
var title = doc.DocumentNode.CssSelect("div.header_cell > a").Single().InnerText;
var links = doc.DocumentNode.CssSelect("a.product_link");
var productLink = new List<string>();
var productTitle = new List<string>();
foreach (var item in links)
{
if (item.Attributes["href"].Value.Contains(".html"))
{
productLink.Add(item.Attributes["href"].Value);
productTitle.Add(title);
}
}
var TitleAndLink = productLink.Zip(productTitle, (l, t) => new { productLink = l, productTitle = t });
foreach (var nw in TitleAndLink)
{
var product = new List<EntryModel>();
var adDetails = new EntryModel
{
Title = nw.productTitle,
Link = nw.productLink
};
Debug.Print(adDetails.ToString());
var ZoekOpdrachtInTitle = adDetails.Title.ToLower().Contains(ZoekOpdracht.ToLower());
if (ZoekOpdrachtInTitle)
{
_entries.Add(adDetails);
}
}
}

So I found the solution without changing too much code. thanks for the help from #PaulSinnema.
The link is part of the title so I only had to change
var title = doc.DocumentNode.CssSelect("div.header_cell > a").ToList();
And I had to change the foreach loop:
foreach (var item in title)
{
if (item.Attributes["href"].Value.Contains(".html"))
{
productLink.Add(item.Attributes["href"].Value);
productTitle.Add(item.InnerText);
}
}

Get duplicate Realtime Database Firebase results in Xamarin

I'm trying to build realtime chat through Realtime Database Firebase and Xamarin. However there is a problem like this, hope someone can help:
protected async void LoadChat()
{
string userid = "123456789";
var getroom = (await fc.Child("RecordsChat").OnceAsync<GetRoomChats>()).Select(x =>
new GetRoomChats
{
RoomID = x.Key
}).ToList();
List<GetRoomChats> listroomuser = new List<GetRoomChats>();
foreach (var room in getroom)
{
string str = null;
string[] strArr = null;
string roomget = room.RoomID;
str = roomget + "_";
char[] splitchar = { '_' };
strArr = str.Split(splitchar);
var getroomuser = strArr.Distinct().ToList();
foreach (var item in getroomuser)
{
if (item == userid)
{
var roomgetuser = new GetRoomChats()
{
RoomID = roomget
};
listroomuser.Add(roomgetuser);
}
}
}
if (listroomuser.Count() > 0)
{
var FirebaseClient = fc
.Child("RecordsChat")
.AsObservable<GetRoomChats>()
.Subscribe(async(dbevent) =>
{
//IteamGetRoomChats.Clear();
foreach (var room in listroomuser)
{
if (dbevent.Key == room.RoomID)
{
var lst = (await fc.Child("RecordsChat").Child(dbevent.Key).OrderByKey().LimitToLast(1).OnceAsync<MyDatabaseRecord>()).Select(x =>
new MyDatabaseRecord
{
NameUser = x.Object.NameUser,
Content = x.Object.Content,
RoomID = x.Object.RoomID,
DayCreate = x.Object.DayCreate,
AvatarUser = x.Object.AvatarUser,
sender_uid = x.Object.sender_uid,
receiver_uid = x.Object.receiver_uid,
receiver_read = x.Object.receiver_read
});
bool unread = false;
foreach (var i in lst)
{
if(i.sender_uid == userid)
{
i.Content = "You: " + i.Content;
var customerList = await apiServiceUserinfo.GetCustomersInfo(i.receiver_uid);
string nameget = customerList.NameStore;
string avatarget = customerList.AvatarStore;
i.NameUser = nameget;
i.AvatarUser = avatarget;
if (i.sender_read == true)
{
unread = false;
}
}
else
{
if (i.receiver_read == false)
{
i.BackgroundUser = "#f5f4f4";
unread = true;
}
}
var last = new GetRoomChats()
{
NameLast = i.NameUser,
ContentLast = i.Content,
RoomID = i.RoomID,
DayCreateLast = i.DayCreate,
AvatarLast = i.AvatarUser,
BackgroundUnread = i.BackgroundUser,
DotUnread = unread
};
IteamGetRoomChats.Add(last);
}
}
}
});
}
BindingContext = this;
}
In my example above, it actually gets the data. I try to check in the loop, to get the last content of the message. However, the displayed results are duplicated
Looking forward to everyone's help. Thank you!

How to make each element of multiple lists appear on DataGrid in a single line

I have a web crawler that takes data from an airlines website.
And I want the program to display each of the elements in their respective lines.
foreach (string url in urlList)
{
driver.Navigate().GoToUrl(url);
try
{
var DepAirport = driver.FindElementsByXPath("//td[#class='depdest']/div[#class='content']").ToList();
var ArrAirport = driver.FindElementsByXPath("//td[#class='arrdest']/div[#class='content']").ToList();
var DepTime = driver.FindElementsByXPath("//td[#class='depdest']/div[#class='content emphasize']").ToList();
var ArrTime = driver.FindElementsByXPath("//td[#class='arrdest']/div[#class='content emphasize']").ToList();
var Price = driver.FindElementsByXPath("//td[#class='fareselect standardlowfare']/div[#class='content']/label[#class='label seatsokfare']").ToList();
foreach(var da in DepAirport)
{
_entries.Add(new EntryModel { DepartureAirport = da.Text });
}
foreach (var aa in ArrAirport)
{
_entries.Add(new EntryModel { ArrivalAirport = aa.Text });
}
foreach (var dt in DepTime)
{
_entries.Add(new EntryModel { DepartureTime = dt.Text });
}
foreach (var at in ArrTime)
{
_entries.Add(new EntryModel { ArrivalTime = at.Text });
}
foreach (var p in Price)
{
_entries.Add(new EntryModel { Price = p.Text });
}
}
catch (Exception e)
{
}
It collects the data and displays it on the Grid, however the results look like this:

You need to set all EntryModel properties. Like this:
for (var i = 0; i < DepAirport.Count; i++)
{
_entries.Add(new EntryModel
{
DepartureAirport = DepAirport[i].Text,
ArrivalAirport = ArrAirport[i].Text,
DepartureTime = DepTime[i].Text,
ArrivalTime = ArrTime[i].Text,
Price = Price[i].Text
});
}
The problem is that every call to _entries.Add(.. creates a new entry and, therefore, a new row. But, each row has only one property set.

C# - How to get full text content from rss feed?

I want the full content from a rss feed, not just the description.
This is what I have:
string RssFeedUrl = "http://g1.globo.com/dynamo/rss2.xml";
List<feed> feeds = new List<feed>();
try
{
XDocument xDoc = new XDocument();
xDoc = XDocument.Load(RssFeedUrl);
var items = (from x in xDoc.Descendants("item")
select new
{
title = x.Element("title").Value,
link = x.Element("link").Value,
pubDate = x.Element("pubDate").Value,
description = x.Element("description").Value
});
if (items != null)
{
foreach (var i in items)
{
feed f = new feed
{
Titulo = i.title,
Link = i.link,
DataPublicada = i.pubDate,
Descricao = i.description
};
feeds.Add(f);
}
}
gvRss.DataSource = feeds;
gvRss.DataBind();
}
catch (Exception ex)
{
throw;
}
It is just retrieving me a short excerpt, but I want the full content text.

Confused about how get value from DictionaryList at specific index

I am using a DictionaryList to keep some values coming from an xml file
this is the my xml file
<DnsServers>
<Dns>
<Name>Google</Name>
<Value>8.8.8.8,8.8.4.4</Value>
</Dns>
<Dns>
<Name>Telekom</Name>
<Value>195.175.39.39,195.175.39.40</Value>
</Dns>
</DnsServers>
and then populating a combobax just key values like this way .
void ReadFromDnsServerList()
{
_nameValueDictionary = new Dictionary<string, string>();
//var list = new List<string>();
XDocument doc = XDocument.Load("DnsServerList.xml");
if (doc.Root != null)
{
var keyValueXml = from c in doc.Root.Descendants("Dns")
select new
{
name = c.Element("Name").Value,
value = c.Element("Value").Value
};
foreach (var info in keyValueXml)
{
_nameValueDictionary.Add(info.name,info.value);
}
foreach (KeyValuePair<string, string> item in _nameValueDictionary)
{
cmbDns.Items.Add(item.Key);
}
}
}
I am wondering that How can I get corresponding dns value inside cmbDns_SelectedIndexChanged
change event somethinglike this
name=Google value =8.8.8.8,8.8.4.4

Try this:
void ReadFromDnsServerList()
{
_nameValueDictionary = new Dictionary<string, string>();
XDocument doc = XDocument.Load("DnsServerList.xml");
if (doc.Root != null)
{
var keyValueXml = from c in doc.Root.Descendants("Dns")
select new
{
name = c.Element("Name").Value,
value = c.Element("Value").Value
};
foreach (var info in keyValueXml)
{
_nameValueDictionary.Add(info.name, info.value);
}
cmbDns.DisplayMember = "Key";
cmbDns.ValueMember = "Value";
cmbDns.DataSource = _nameValueDictionary.ToArray();
}
}
I hope it helps.