using-statement

include and using namespace in C++

for using cout, I need to specify both: #include<iostream> and using namespace std; Where is cout defined? in iostream, correct? So, it is that iostream itself is there in namespace std? What is the meaning of both the statements with respect to using cout? I am confused why we need to include them both. ...

How do make unwanted namespaces to not appear by default on top of new classes

In Visual Studio 2008 C#, if I create a new class the following namespaces appear by default and I remove them manually every time. Is there a setting/folder template where I can go and remove these unwanted namespaces from appearing on each and every new class that's created on the project? using System.Collections.Generic; using Syste...

Does a C# using statement perform try/finally?

Suppose that I have the following code: private void UpdateDB(QuoteDataSet dataSet, Strint tableName) { using(SQLiteConnection conn = new SQLiteConnection(_connectionString)) { conn.Open(); using (SQLiteTransaction transaction = conn.BeginTransaction()) { using (SQLiteCommand cmd = new SQLit...

Should '#include' and 'using' statements be repeated in both header and implementation files (C++)?

I'm fairly new to C++, but my understanding is that a #include statement will essentially just dump the contents of the #included file into the location of that statement. This means that if I have a number of '#include' and 'using' statements in my header file, my implementation file can just #include the header file, and the compiler w...

Disposables, Using & Try/Catch Blocks

Having a mental block today, need a hand verifying my logic isn't fubar'ed. Traditionally I would do file i/o similar to this: FileStream fs = null; // So it's visible in the finally block try { fs = File.Open("Foo.txt", FileMode.Open); /// Do Stuff } catch(IOException) { /// Handle Stuff } finally { if (fs != null) ...

C#, weird optimization

Hi, I'm trying to read my compiled C# code. this is my code: using(OleDbCommand insertCommand = new OleDbCommand("...", connection)) { // do super stuff } But! We all know that a using gets translated to this: { OleDbCommand insertCommand = new OleDbCommand("...", connection) try { //do super stuff } ...

return the variable used for using inside the using C#

Hello, I am returning the variable I am creating in a using statement inside the using statement (sounds funny): public DataTable foo () { using (DataTable properties = new DataTable()) { // do something return properties; } } Will this Dispose the properties variable?? After doing this am still getting th...

Why are the using directives inside of the namespace in Silverlight 4/VS 2010?

Why are the using statements inside of the namespace in Silverlight 4/VS 2010 auto-generated code? The new convention seems to be namespace myNamespace { using System.Windows.Controls; using System.Windows.Navigation; . . . public myClass() {} } rather than the standard: using System.Windows.Controls; using System....

Is there a better way to avoid an infinite loop using winforms?

I am using .Net 3.5 for now. Right now I am using a using trick to disable and enable events around certain sections of code. The user can change either days, hours, minutes or total minutes, and that should not cause an infinite cascade of events (e.g. minutes changing total, total changing minutes, etc.) While the code does what I wan...

/clr option in c++

Can someone help me find a solution to the following error: "fatal error C1190: managed targeted code requires a '/clr' option" My configuration is .. Visual studio 2008 Windows 7 Here is the code (i got by using net resources) #using <mscorlib.dll> using namespace System; using namespace System::IO; int main() { // C...

A question of style/readability regarding the C# "using" statement

I'd like to know your opinion on a matter of coding style that I'm on the fence about. I realize there probably isn't a definitive answer, but I'd like to see if there is a strong preference in one direction or the other. I'm going through a solution adding using statements in quite a few places. Often I will come across something like ...

c# using statements placement

Possible Duplicate: Should Usings be inside or outside the namespace I am looking at a code base where the author (one I respect) consistently places using statements inside of the namespace, as opposed to above it. Is there some advantage (more efficient GC?) to doing so or is this just a code style preference? Cheers, Berry...

Using Reflection.Emit to emit a "using (x) { ... }" block?

I'm trying to use Reflection.Emit in C# to emit a using (x) { ... } block. At the point I am in code, I need to take the current top of the stack, which is an object that implements IDisposable, store this away in a local variable, implement a using block on that variable, and then inside it add some more code (I can deal with that last...

Reference not showing in VS 2010 project

Hello, Has anyone had an issue adding an existing project to a Silverlight business application and unable to use that new reference? I had an existing project folder that I am trying to import into a new app and I am unable to see any of the properties of the new project that I added. using dt.Model; The above gives me a red line ...

VB.NET: question about "using" block

Consider the code: On Error Goto ErrorHandler Using sr As StreamReader = New StreamReader(OpenFile) str = sr.ReadToEnd sr.Close() End Using Exit Sub ErrorHandler: If there is an error inside the Using block how do you clean up the sr object? The sr object is not in scope in ErrHandler so sr.Close() cannot be called. Does ...

The C# using statement, SQL, and SqlConnection

Is this possible using a using statement C# SQL? private static void CreateCommand(string queryString, string connectionString) { using (SqlConnection connection = new SqlConnection( connectionString)) { SqlCommand command = new SqlCommand(queryString, connection); command.Connection.Open(); ...

Am I closing this SQL connection in a C# function appropriately?

In an attempt to close my question on connections remaining open and exceeding the maximum pool, I'm trying tor rewrite the function that is used to connect to our database. The function exists within a homegrown compiled library. using reflector I can see the code looks like this: public SqlProvider([Optional, DefaultParameterValue(""...

import statement mess in python

I want to have a number of files imported in a general python file and then include that file when I need the imported modules in the current module. This of course will lead to errors and re-imports if using the from x import y, however when using the "normal" import statement I end up with long instruction statements, for example: x =...

How should I replicate the functionality of C#'s 'using' keyword in Java?

I'm converting some C# code to Java and it contains the using keyword. How should I replicate this functionality in Java? I was going to use a try, catch, finally block but I thought I'd check with you guys first. ...

C# using statement

I really want to get this out of my head. Please see below code: using (DataTable resultTable = DBUtility.GetSingleDBTableResult(connectionString, "SELECT * FROM MyDBTable")) { List<string> resultsList = new List<string>(); foreach (DataRow dataRow in resultTable.Rows) { resultsList.Add(dataRow[0].ToString()); } ...