nullreferenceexception

I'm experiencing "null reference exception" when I'm attempting to return a value from a structure. here is the code: AssetItem item = new AssetItem(); item = initModified(); bool found = false; int index = getIndex(barcode); string modifiedFile = filepath + "Modified\\" + dir + "\\" + index + ".asdt"; if(File.Exists(modifiedFile)) { using(StreamReader reader = new StreamReader(modifiedFile)) { string line = reader.ReadLine(); while(line.Trim()!="") { string[] split = line.Split(','); if(split[1]==barcode) { found = true; break; } line = reader.ReadLine(); } reader.Close(); } } if(found) {

This question already has an answer here: getContactsFromFirebase() method return an empty list 1 answer public class ShowBPGraphActivity extends AppCompatActivity { public GraphView graphView; public LineGraphSeries <DataPoint>lineGraphSeries; public String systolicbp; public String diastolicbp; public String timebp; public String datebp; public DatabaseReference db; public BPFragmentTable bpFragmentTable = new BPFragmentTable( ); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate( savedInstanceState ); setContentView( R.layout.activity_show_bp_graph ); ButterKnife

When I step through the following code, report on the second line is null. However, the third line generates a NullReferenceException. member this.setTaggedResearchReportList (index : int) (taggedResearchReport : TaggedResearchReportUIVO option) = let report = Option.get(taggedResearchReport) if not(report.Equals(null)) then // do some stuff here Why is that, and what can I do to avoid it? Thanks! Added later: Here's the line that calls this.setTaggedResearchReportList : getMostRecentTaggedResearchReportForSecurityId (item.id) (new Action<_>(this.setTaggedResearchReportList 0)) Here's the

I have following classes. class Tim { public Tim() { } public Tom GetTom() { return new Tom(); } } class Tom { public Tom() { } public Jim GetJim() { return new Jim(); } } class Jim { public Jim() { } public Jom GetJom() { return null; } } class Jom { public Jom() { } public string GetMagicString() { return "Hello World"; } } Its used as follows. class Program { static void Main(string[] args) { new Tim().GetTom().GetJim().GetJom().GetMagicString(); } } When I run it, a Null Reference exception is thrown and new Null Reference Analysis results shows beautifully in the new Exception Helper as

The following code throws a NullReferenceException : internal class Foo { public Collection<string> Items { get; set; } // or List<string> } class Program { static void Main(string[] args) { new Foo() { Items = { "foo" } // throws NullReferenceException }; } } Why don't collection initiliazers work in this case, although Collection<string> implements the Add() method, and why is NullReferenceException is thrown? Is it possible to get the collection initializer working, or is Items = new Collection<string>() { "foo" } the only correct way to initialize it? Sriram Sakthivel You never

We do come across this particular and one of the most common exception in our coding/development life day or another day. My Question is NOT about WHY (I am aware it raises when we try to access properties of a reference variable which actually points to null) but its is about HOW the NULL REFERENCE EXCEPTION is generated by CLR. Sometimes I am forced to think the mechanism for identifying a reference to a null (Perhaps null is a reserved space in memory) and then raising an Exception by CLR. How CLR identify and raises this particular Exception. Does OS play any role in it? I would like to

How in the world do i get a handle on the store inside of a component? I'm trying to create an auto-complete component that returns results from the store. App.AutoCompleteComponent = Ember.Component.extend({ //------------------------------------------- // Ember Properites //------------------------------------------- content: Ember.ArrayController.create(), //------------------------------------------- // Instance Properties //------------------------------------------- queryText: "", componentItemSelected: null, //------------------------------------------- // Observers //------------------