Hello i have this code:

using (WebClient client = new WebClient())
{
    string TargetFileName = @"C:\test.txt";
    var resStr = client.UploadFile(@"https://discord.com/api/webhooks/959919400243326976/uGiJbuiddUbEGovMgKtx2Z-byUX7jvhCcqgs5-IBYq1pAIrKlpnyVvjrMicJjS9tC_-a", TargetFileName);
    var jObjResult = JObject.Parse(Encoding.UTF8.GetString(resStr));
    var linkToFile = jObjResult["data"]["file"]["url"]["full"].ToString();    
}

It works well but i need get sent file's (test.txt) link and write it inside Console like

Console.Write("File is sent to webhook! Link: " + <test.txt's link>);

But im taking that error:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

How to fix it?