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• Operation can only be performed on rows that belong to a DataGridView control?

  - by Behrooz

  it happens when i change the DataSource. i have checked everything(stack traces, all exception information, datasources, grids, all the threads, etc) i have also write lots of diagnostic code(+3000 line) it seems to be a virus, it is going to destroy everything in my app. all grids are going to have the very same error.(while i have not changed any of the code).wtf . it makes my datagridviews to have an red X on them.

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• Class with proprties that haven't been set

  - by koumides

  Hello there, I am creating a class in C# which eventually will be part of a library that other uses can use. A user of this class has to set some properties and then use a public method to retrieve the results. What shall I do when a user calls the method without setting all the properties? Throw exception and expect the user to catch it? Thanks

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• How can I define multiple types with the same name and different type parameters using Reflection Em

  - by wawa

  How can I generate types like these using the System.Reflection.Emit libraries: public class Test<T> {} public class Test<T1, T2> {} When I call ModuleBuilder.DefineType(string) with the second type declaration, I get an exception because there is already another type in the module with the same name (I've already defined the type parameter on the first type). Any ideas?

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• How to handle error on other thread?

  - by markattwood

  Hi, I'm trying to handle errors that have occurred on other threads the .NET CF program is like below: static void Main() { Thread t = new Thread(Start); t.Start(); ... } void Start() { ... Exception here } In my situation, putting try catch in the Start method is impossible. How can I handle it in the global code?

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• How to iterate through two IEnumerables simultaneously?

  - by Danvil

  I have to enumerables IEnumerable<A> list1 and IEnumerable<B> list2 and would like to iterate through them simultaneously like: foreach((a, b) in (list1, list2)) { // use a and b } If they do not contain the same number of elements, an exception should be thrown. What is the best way to do this?

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• How to access a superclass method from a nested class?

  - by m01

  I hope this code explains the problem: class Foo { void a() { / *stuff */ } } class Bar extends Foo { void a() { throw new Exception("This is not allowed for Bar"); } class Baz { void blah() { // how to access Foo.a from here? } } } I know that I may be doing something wrong, because inheritance perhaps shouldn't be used in such way. But it's the easiest way in my situation. And, beside that, I'm just curious. Is it possible?

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• jQuery Treemap Plugin

  - by Revert

  Hello, I am trying to get the Treemap plugin (http://www.jquery.info/spip.php?article40) working with jQuery v1.3.x. The plugin works with jQuery v1.1 and v1.2 but for some reason it fails with the v1.3 base. This is the browser error "Error: uncaught exception: Syntax error, unrecognized expression: " Does anyone know changes occurred between JQuery v1.2 and v1.3 that could cause this? Cheers, D

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• I need a way to implement the function matches() from XPath 2.0 with functions from XPath 1.0

  - by Jenny Smith

  I have the following piece of code: root="//valueExpression[matches(self::*,'pattern')]/.." But I can only use XPath 1.0 and I get an exception for the function matches(). Can you please help me with a solution using only functions from XPath 1.0 ?

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• Check if a connection is in a transaction

  - by acidzombie24

  I am getting a SqlConnection does not support parallel transactions. exception and this answer mentions its when a connection tries to open two transactions. This is exactly what i am doing. I thought nested transactions were ok (i was using sqlite for the prototype). How do i check if the connection is already in a transaction? I am using Microsoft SQL Server Database File.

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• Open/browse a password protected mapped network drive

  - by Ravisha

  I just want open a mapped network drive from C# code ,it is apssword protected, so when i try to launch directly it gives exception. Can some one throw light on providing username password while opening the this drive

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• How to debug ctypes call of c++ dll?

  - by aF

  Hello, in my python project I call a c++ dll using ctypes library. That c++ dll consists on a wrapper dll that calls methods of a c# com interop dll. Sometimes I have a COM exception. I like to see what it corresponds exactlly but I don't know how to do it? How can I attach the c++ debugger to this situation? Thanks in advance

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• How do I define my own operators in the Io programming language?

  - by klep

  I'm trying to define my own operator in Io, and I'm having a hard time. I have an object: MyObject := Object clone do( lst := list() !! := method(n, lst at(n)) ) But when I call it, like this: x := MyObject clone do(lst appendSeq(list(1, 2, 3))) x !! 2 But I get an exception that argument 0 to at must not be nil. How can I fix?

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• Can I make a SQL Server 2005 Table Column accept only letters and numbers ?

  - by Space Cracker

  When we have a column that will store a username that will only accept letters and numbers we always do validation on this input field using javascript or even server validation from code .. but i want to know if is there any way that can allow me make this validation on the Table column itself even some one try to enter data from any place it don't accept and throw exception ?

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• Is it standard behavior for this code to throw a NullPointerException?

  - by Eric

  I've had a big problem in some library code, which I've pinned down to a single statement: System.out.println((String) null); Ok, the code doesn't actually look like that, but it certainly calls println with a null argument. Doing this causes my whole applicaio to throw an unexpected NullPointerException. In general, should println throw this exception under that circumstance, or is this non-standard behavior due to a poor implementation of the out instance?

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• Returning an error code in Erlang

  - by Zubair

  I'm writing some Erlang code and I'm very unsure whether I should let everything fail fast. One problem I find with fail fast is that for the developer/user the exception generated is pretty meaningless. Any idea what I should return which would not give esoteric and hard to read stack traces?

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• "The operation has timed out" when trying to send email

  - by user1718859

  protected void Button1_Click(object sender, EventArgs e) { try { SmtpClient sm = new SmtpClient(); MailMessage ms = new MailMessage(); ms.To.Add(new MailAddress(TextBox1 .Text )); ms.Subject = TextBox2.Text; ms.Body = TextBox3.Text; ms.IsBodyHtml = true; sm.Send(ms); } catch (Exception el) { Response.Write(el.Message); } }

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• saving an image object in sql server database from action method

  - by user3532152

  [HttpPost] public void Test(HttpPostedFileBase file) { UsersContext db = new UsersContext(); byte[] image = new byte[file.ContentLength]; file.InputStream.Read(image, 0, image.Length); CrimeReport i = new CrimeReport { ImageId=1, ImageName="Anjli",ImageContent = image, Active=true }; db.CrimeReports.Add(i); db.SaveChanges(); } I am getting an exception on db.CrimeReports.Add(i);

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• javascript error causes page reload?

  - by seanlinmt

  I have been getting some weird page refresh in deployment and I can't seem to find the cause of it or replicate it in development. Is there a way for a javascript error or exception to cause a page reload? Or some tips to help me narrow down the cause?

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• Struts formbean problem

  - by xain

  Hi, I have a struts app with a jsp with the code: ... ... <input name="inrofol" class="inputfilter" id="inrofol" size="22" maxlength="20" type="text"> ... And even though it's not linked to the associated form bean, I get the exception Error 500: No getter method for property: "inrofol" of bean: "com.test.forms.CompForm" Any hints ? Thanks

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• Can two different UDP socket in a system bind same port?

  - by swift

  I have an application which uses UDP connection, now when i try to run the app more than once its throwing me an exception java.net.BindException: Address already in use: Cannot bind but in my another app, which uses tcp connection, i can open two instance of the same app and its working fine. why this error only with UDP connection?

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• LINQ display row numbers

  - by timvaines

  I simply want to include a row number against the returned results of my query. I found the following post that describes what I am trying to achieve but gives me an exception http://vaultofthoughts.net/LINQRowNumberColumn.aspx "An expression tree may not contain an assignment operator" In MS SQL I would just use the ROWNUMBER() function, I'm simply looking for the equivalent in LINQ.

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• Validating alphabetic only string in javascript

  - by Click Upvote

  How can I quickly validate if a string is alphabetic only, e.g var str = "!"; alert(isLetter(str)); // false var str = "a"; alert(isLetter(str)); // true Edit : I would like to add parenthesis i.e () to an exception, so var str = "("; or var str = ")"; should also return true.

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• Multi-Dimensional Array and ArrayIndexOutOfBoundsException

  - by notset

  Hello, I have a strange problem which I can't fix: A field: private boolean[][][] gaps; Constructor (1st line): gaps = new boolean[NOBARRICADES][WIDTH][HEIGHT]; Constructor (2nd line): for (int i = 0; i < NOBARRICADES; i++) { JAVA throws an error for the 2nd line, saying: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException Does it have anything to do with JAVA syntax (the mistake is in these lines of code) or I should look for the problem somewhere else?

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• Find out which object being added to NSMutableArray is nil

  - by Raphael Caixeta

  I started a project using ARC, and I'm inserting a few objects into an NSMutableArray. The objects have all started out as NSStrings, and when attempting to add these objects into the array, I get the following error: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' -[__NSArrayM insertObject:atIndex:]: object cannot be nil This array is holding several objects. Is there a quick way for me to find which of the objects I'm attempting to put into the array is nil?

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• VS2005: two projects doing identical tasks but with different result

  - by Craig Johnston

  In VS2005 I have multi-project solution. Two of the projects use an external set of DLLs to create a report, using report definition data taken from an SQL Server. One of the projects creates the report just fine, but the other project results in an Exception. I have checked that the projects are referencing the same versions of the all the DLLs and they appear to be identical. What could the cause of this problem?

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