NullReferenceException was unhandled

[tookerello]

Hi could you please help with this as i have been trying to correct it for hours:
I keep receiving the "NullReferenceException was unhandled" message

public static Conditions GetCurrentConditions(string location)
        {
            Conditions c;
            c = null;
            c = new Conditions();
 
            c.GetCurrentConditions();
 
            XmlDocument xmlConditions = new XmlDocument();
            xmlConditions.Load(string.Format("http://www.google.com/ig/api?weather={0}", location));
            if (xmlConditions.SelectSingleNode("xml_api_reply/weather/problem_cause") != null)
            {
                c = null;
            }
            else
            {
                Conditions cond = new Conditions();
                cond.Town = xmlConditions.SelectSingleNode("/xml_api_reply/weather/forecast_information/city").Attributes["data"].InnerText;
                cond.Condition = xmlConditions.SelectSingleNode("/xml_api_reply/weather/current_conditions/condition").Attributes["data"].InnerText;
                cond.TempC = xmlConditions.SelectSingleNode("/xml_api_reply/weather/current_conditions/temp_c").Attributes["data"].InnerText;
                cond.TempF = xmlConditions.SelectSingleNode("/xml_api_reply/weather/current_conditions/temp_f").Attributes["data"].InnerText;
                cond.Humidity = xmlConditions.SelectSingleNode("/xml_api_reply/weather/current_conditions/humidity").Attributes["data"].InnerText;
                cond.Wind = xmlConditions.SelectSingleNode("/xml_api_reply/weather/current_conditions/wind_condition").Attributes["data"].InnerText;
 
            }
 
            return c;
        }

[Monomachus]

@tookerello
put a try-catch block into your method GetCurrentConditions and see where exactly it throws exception and tell us more details.

[tlhintoq]

TIP: When you first created your question you were asked to wrap your code with [code] tags.

It really does help a bunch. Look how much easier it is to read now that someone has done it for you. Its the button with a '#' on it.

More on tags. They're cool. Check'em out.

[tlhintoq]

Original Poster: "How do I fix a 'object reference not set to an instance of an object' error?

The line your code stopped on while debugging holds all your answers.
One of the variables/objects was created but not initialized. For example:

string TempString;// Created but not initialized so this is still null
//versus
string TempString = string.empty;

Debug your project again. This time, when it breaks on a line look at the Locals pallet to see which variable/object is null. You can also hover your mouse over each variable and the hothelp will shows its value. One of them will be null.

[tlhintoq]

Conditions c;
            c = null;
            c = new Conditions();

can be reduced to

Conditions c = new Conditions();

Why have 3 lines when 1 will do just as cleanly?