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how to check if user already exists in firebase c#

I built a login/register system, and I want that when you create a username it checks if email exists, it works fine and it shows the message box "Email exists", but when it is a new user and there is no email that exists, it crashes.
Here is the exception message:
(System.NullReferenceException) Message=The object reference was not set to an object instance
Code:
FirebaseResponse response = await client.GetTaskAsync("Information/" + Emailtextbox.TextName);
Data result = response.ResultAs<Data>();
if (Emailtextbox.TextName == result.Email)
{
MessageBox.Show("Email exists");
} else
{
var data = new Data
{
Email = Emailtextbox.TextName,
Fullname = Fullnametextbox.TextName,
Password = EncryptSHA.GetShaData(PasswordTextbox.TextName)
}
};

Updating this based on the screenshot of the error as well as the information provided in the following comments.
It looks like your error has to do with what's being returned from your client.GetTaskAsync("Information/" + Emailtextbox.Textname); call.
My recommendation would be to try and understand what it is you're receiving from that call (what's stored in your response object). With the latest screenshot I see that the Body is null, and that might be part of the problem. Try expanding what you see in the Response object in your response and see if you're even receiving any kind of data you can use and go from there.

DocuSign SOAP API Title Tab does not keep value

I am using DocuSign SOAP API in an ASP.NET app in C# to send some docs for e-signature.
One of the field is the title tab. I have the following code for that.
When testing, the tab correctly shows the title, which is picked up from the back-end DB. But when I see the completed document, the title is changed to something else. Does anyone know how can I resolve this?
When signing, if I modify the value - add and remove space - it works OK.
tab5 = new DocuSignAPI.Tab();
tab5.RecipientID = rcpt1.ID;
tab5.DocumentID = docId;
tab5.Type = DocuSignAPI.TabTypeCode.Custom;
tab5.CustomTabType = DocuSignAPI.CustomTabType.Text;
tab5.Name = "clientTitle";
tab5.CustomTabTypeSpecified = true;
tab5.Value = (dr["Rcpt_1_Role"]).ToString();
tab5.Type = DocuSignAPI.TabTypeCode.Title;
tab5.AnchorTabItem = new DocuSignAPI.AnchorTab();
tab5.AnchorTabItem.AnchorTabString = "CLIENT TITLE:";
tab5.AnchorTabItem.Unit = DocuSignAPI.UnitTypeCode.Pixels;
tab5.AnchorTabItem.UnitSpecified = false;
tab5.AnchorTabItem.IgnoreIfNotPresent = true;
tab5.AnchorTabItem.UnitSpecified = true;
tab5.AnchorTabItem.YOffset = -10;
tab5.AnchorTabItem.XOffset = 100;

When using certain DocuSign tab types (such as titleTabs or emailTabs for instance) the DocuSign platform will populate some of that information from the user's account if they have one.
For example, if the user has a DocuSign account where they have entered the title "CEO", then whenever you send an envelope to that exact recipient (name and email combo) and you use a titleTab the system will populate from their account.
I do not believe there is a way to override this, probably your best option is to just use a textTab instead and with that you can populate with any data from a database or wherever else you want to supply it from.

C# Get Values from two different websites

I am using HTMLElementCollection, HtmlElement to iterate through a website and using Get/Set attributes of a website HTML and returning it to a ListView. Is it possible to get values from website a and website b to return it to the ListView?
HtmlElementCollection oCol1 = oDoc.Body.GetElementsByTagName("input");
foreach (HtmlElement oElement in oCol1)
{
if (oElement.GetAttribute("id").ToString() == "search")
{
oElement.SetAttribute("value", m_sPartNbr);
}
if (oElement.GetAttribute("id").ToString() == "submit")
{
oElement.InvokeMember("click");
}
}
HtmlElementCollection oCol1 = oDoc.Body.GetElementsByTagName("tr");
foreach (HtmlElement oElement1 in oCol1)
{
if (oElement1.GetAttribute("data-mpn").ToString() == m_sPartNbr.ToUpper())
{
HtmlElementCollection oCol2 = oElement1.GetElementsByTagName("td");
foreach (HtmlElement oElement2 in oCol2)
{
if (oElement2 != null)
{
if (oElement2.InnerText != null)
{
if (oElement2.InnerText.StartsWith("$"))
{
string sPrice = oElement2.InnerText.Replace("$", "").Trim();
double dblPrice = double.Parse(sPrice);
if (dblPrice > 0)
m_dblPrices.Add(dblPrice);
}
}
}
}
}
}

As one of the comments mentioned the better approach would be to use HttpWebRequest to send a get request to www.bestbuy.com or whatever site. What it returns is the full HTML code (what you see) which you can then parse through. This kind of approach keeps you from seinding too many requests and getting blacklisted. If you need to click a button or type in a text field its best to mimic human input to avoid being blacklisted also. I would suggest injecting a simple javascript into the page header or body and execute it from the app to send a 'onClick' event from the button (which would then reply with a new page to parse or display) or to modify the text property of something.
this example is in c++/cx but it originally came from a c# example. the script sets the username and password text fields then clicks the login button:
String^ script = "document.GetElementById('username-text').value='myUserName';document.getElementById('password-txt').value='myPassword';document.getElementById('btn-go').click();";
auto args = ref new Platform::Collections::Vector<Platform::String^>();
args->Append(script);
create_task(wv->InvokeScriptAsync("eval", args)).then([this](Platform::String^ response){
//LOGIN COMPLETE
});
//notes: wv = webview
EDIT:
as pointed out the absolute best approach would be to get/request an api. I was surprised to see that site mason pointed out for bestbuy developers. Personally I have only tried to work with auto part stores who either laugh while saying I can't afford it or have no idea what I'm asking for and hang up (when calling corporate).
EDIT 2: in my code the site used was autozone. I had to use chrome developer tools (f12) to get the names of the username, password, and button name. From the developer tools you can also watch what is sent from your computer to the site/server. This allows you to recreate everything and mimic javascript input and actions using post/get with HttpWebRequest.

Setting Value of an Input Tag in WebBrowser Control

I am attempting to help a user log into their account using a custom WebBrowser control. I am trying to set the value of an input tag to the players username using the WebBrowser's InvokeScript function. However, my current solution is doing nothing but rendering a blank white page.
My current code looks like this (web is the name for my WebBrowser control):
web.Navigate(CurrentURL, null, #"<script type='text/javascript'>
function SetPlayerData(input) {
username.value = input;
return true;
}
</script>");
web.Navigated += (o, e) =>
{
web.IsScriptEnabled = true;
web.InvokeScript("SetPlayerData", #"test");
};
As mentioned, this does not work right now. I am attempting to do this on Windows Phone so a number of the example's I have found here and in other places will not work as I do not have access to the same functions.
How would I perform this successfully?
EDIT: Perhaps I was not clear, but I am working with Windows Phone, which has a limited API available meaning I do not have access to the Document property and a number of other functions. I do have access to InvokeScript, but not much more.

webBrowser1.Document.GetElementById("navbar_username").InnerText ="Tester";
webBrowser1.Document.GetElementById("navbar_password").InnerText = "xxxxxxxxxxx";
foreach (HtmlElement HtmlElement1 in webBrowser1.Document.Body.All)
{
if (HtmlElement1.GetAttribute("value") == "Log in")
{
HtmlElement1.InvokeMember("click");
break;
}
}
you may find more here : http://deltahacker.gr/2011/08/15/ftiakste-to-diko-sas-robot/

It's been along time since this question is posted but I think I'll post an answer to this so that it will help some one who came across the same situation
try
{
webBrowser1.Document.GetElementById("navbar_username").SetAttribute("value", "your user");
webBrowser1.Document.GetElementById("navbar_password").SetAttribute("value", "your pass");
webBrowser1.Document.GetElementById("Log in").InvokeMember("click");
}
catch { }

InterIMAP, Viewing UNREAD IMAP mail and Downloading Attachments in C#

I was wondering if anyone can help me on this cause its driving me mad trying get this working
I was working with the trail of mail.dll from http://www.lesnikowski.com/mail/ which is an extremely fantastic tool which unfortunately i cannot afford being a student (even though its around 150eur, its still very expensive to me :/) and this would be a small module in my thesis and my faculty cannot afford to buy these things for students either :/ so anyway I had to go for a free tool (so please dont suggest any non open source ones - trust me i have tried them ALL)..
Well, i'm trying to explore InterIMAP, and for several hours have been trying to list unread emails from my gmail account but it just doesn't seem to be working. I can connect just fine but finding the unread emails seems to be no easy task.. I have tried countless approaches but non seem to give me unread emails in my inbox (I have loads of emails in my inbox and i just want the unread ones). Would someone please assist me? I have been trying to get this working for ages now, but documentation is rather lacking and my every attempt has resulted in a fail so far.
Please help!!
Some code i currently have:
` IMAPConfig config = new IMAPConfig("myhost", "username", "pass", true, true, "");
config.CacheFile = "";
IMAPClient client = null;
try
{
client = new IMAPClient(config, null, 5);
}
catch (IMAPException e)
{
Console.WriteLine(e.Message);
return;
}
Console.WriteLine(DateTime.Now.ToString());
IMAPFolder f = client.Folders["INBOX"];
IMAPSearchResult sResult = f.Search(IMAPSearchQuery.QuickSearchNew()); // <--- Gives me no results even though i do have unread messages!

If you did't reach your goal, here we go:
You should code in the following way:
1st: Inside your SearchQuery class, add a new property "unread", for example.
2nd: Add a new Method that returns an IMAPSearchQuery. It'll quick search unread mails. Something like that:
public static IMAPSearchQuery QuickSearchUnread()
{
IMAPSearchQuery query = new IMAPSearchQuery();
query.unread = true;
return query;
}
3td: Inside your class IMAPFolder, you have a method called that will return an IMAPSearchResult type and that receives an IMAPSearchQuery as parameter.
This method "build" your query with IMAP command queries (IMAP based protocol).
To the Unread query you should add:
public IMAPSearchResult Search(IMAPSearchQuery query)
{
...
if (query.Unread)
searchTerms.Add("UNSEEN");
.
.
...
}
4th: Call the Search method with the new QuickSearch:
config.CacheFile = "";
IMAPClient client = null;
try
{
client = new IMAPClient(config, null, 5);
}
catch (IMAPException e)
{
Console.WriteLine(e.Message);
return;
}
Console.WriteLine(DateTime.Now.ToString());
IMAPFolder f = client.Folders["INBOX"];
IMAPSearchResult sResult = f.Search(IMAPSearchQuery.QuickSearchUnread());
Let me know about your progress.
I hope it can be helpful.
Bye.

I honestly just ended up using Mail.dll trial version as interIMAP was not working properly for me and way to slow because it indexes the emails for some reason :s