If I explicitly put an oracle connection in a Using{} block I know that it will call the Dispose() method when it goes out of scope. My question is will the OracleConnection object be disposed in the following code block:
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The OracleConnection is implicitly within the Using{} block for the OracleCommand and goes out of scope at the same time.
I am using .net framework 4 and connecting to oracle 10 g via System.Data.OracleClient. It is working but it says it is deprecated and what else should I use instead of it?
View 2 RepliesI have a program that calls a thread, which starts an oracle connection and runs a query that takes about 5 minutes to complete. I want the user to be able to cancel the action if desired. When I call the Close() method on the connection, it takes a good 2 - 3 minutes to close the connection, and then the thread aborts. Is there some way I can get the connection to close faster?
View 1 RepliesI have a page where I load a couple of dropdown lists from the database (DB). I do this by calling a general function that connects to the DB and gets the data to the dropdownlist. This means that I can have three queries to the DB while rendering one page.
should I close and dispose the sqlconnection, sqlcommand and sqldatareader at the end of this function?
Would it be faster if I left it open for the next call, if you get what I mean, or is it best to close and dispose it every time?
All implementation of IHttpModule I've seen looks following:
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I am wondering why is the Dispose method always empty? Shouldn't we unsubscribe the event which we subscribe in the Init method?
At MVC 2 I do this: [URL]
But with MVC 3, I canīt create a child container per request(in really I can, using the old way), because container is hold at a static variable: DependencyResolver.SetResolver(new UnityDependencyResolver(container));
Which the better way to Dispose created objects? Since I use Repositories and Entity Framework (that need Dispose). As said here [URL] HttpRequestLifetimeManager donīt dispose objects....
I Want to know garbage collector works in .net there is something heap and stack funda.so can u please tell me from where i get reference of whole funda of that.and i have another question is that Please see below the code.here i declare one dt and get some data in it.and i don't want that dt after data come in text boxes.so in finally method i do dispose using dt.dispoe().but after that i write little code to check whether the dt correctly dispose or not.so i check with ifcondition after disposing.you can check code given below for that condition.as per condition it gives me "Nikunj" Ouput in message box it meanse dt is not disposed after calling the dispose method.so can u please tell me why?And i Want to know about all resources which i used i want to know how can i free it.whether it is variable,object,datatable,datareader etc..... if it is any where with example then please give me link.and if it's from msdn then it's better. i want to know from Microsoft that how Microsoft Suggest to do that.
Private Sub grd_expense_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles grd_expense.DoubleClick
Dim dt As DataTable
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I am using Visual studio 2010, oracle 10g, Windows server 2008 (64 bit).
I am gettign followign error message when trying to verify datasource of crystal report from visula studio.
Steps. open report -> fields explore -> right click -> Verify datasoucrce -
> select data source, enter userid & password.
showig error message
Logon failed.
Details: ADO Error Code: 0x80004005
Source: Microsoft OLE DB Provider for Oracle
Description: Oracle client and networking components were not found. These components are supplied by Oracle Corporation and are part of the Oracle Version 7.3.3 or later client software installation.
Provider is unable to function until these components are installed.
Is there any real purpose to calling Dispose() on a Linq to SQL query? I want my site to be scalable so I'd like to control the datacontext but if it's not necessary I don't see a point.
View 9 Repliesi am using MVC for my project in the logon authentication, when i login using correct values there is no problem.
If i login using false or empty values i get the DataContext accessed after Dispose error.
i get it in the first line itself 'using (HealthObjectDataContext dc = DataContextFactory.GetDataContext())'
this is the method i use in the security service.
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There's a problem, wherein a XML Document.Save is resulting in the error the process cannot access the file, because it is being used by another process or the statement an Invalid XML Document.I think it's because I do not dispose the XML Document object after it's operation is complete.Is it possible to do this.Is there a workaround?
View 2 RepliesWhen you create and use a Web Service proxy class in the ASP.Net framework, the class ultimately inherits from Component, which implements IDisposable. I have never seen one example online where people dispose of a web proxy class, but was wondering if it really needs to be done. When I call only one method, I normally wrap it in a using statement, but if I have a need to call it several times throughout the page, I might end up using the same instance, and just wondered what the ramifications are of not disposing it.
View 4 RepliesI have a member class that returned IQueryable from a data context
public static IQueryable<TB_Country> GetCountriesQ()
{
IQueryable<TB_Country> country;
Bn_Master_DataDataContext db = new Bn_Master_DataDataContext();
country = db.TB_Countries
.OrderBy(o => o.CountryName);
return country;
}
As you can see I don't delete the data context after usage. Because if I delete it, the code that call this method cannot use the IQueryable (perhaps because of deferred execution?). How to force immediate execution to this method? So I can dispose the data context..
I have an ASP.net page that is creating a service reference to a WCF service and making calls in multiple places in my page. I instantiate the service reference in Page_Load and have an instance variable to store it:
private FooClient _serviceClient;
protected void Page_Load(object sender, EventArgs e)
{[code]...
I just discovered that I need to be disposing of the service reference when I am done using it or else the connections will be kept alive and will block incoming connections if I reach the max number of connections. Where would the best place to dispose of these references be? I was thinking of doing it on the OnUnLoad event.
I have a class DocumentGenerator which wraps a MemoryStream. So I have implemented IDisposable on the class.
I can't see how/where I can possibly dispose it though.
This is my current code, which performs a file download in MVC:
using (DocumentGenerator dg = DocumentGenerator.OpenTemplate(path))
{
/* some document manipulation with the
DocumentGenerator goes here ...*/
return File(dg.GetDocumentStream(), "text/plain", filename);
}
This errors as the stream is closed/disposed before the controller has finished with it. How can I make sure my resources are properly disposed in this situation?
EDIT: My implementation of IDisposable at the moment just disposes the MemoryStream. I know it's not a proper implementation, I just used it as a test. Is there something different I could do here to make it work?
public void Dispose()
{
_ms.Dispose();
_ms = null;
}
what is the best to close or dispose all the ado.net object
eg:datareader.close(); or sqlcommand.Dispose();
if programs hangs in the middle(because of error), then how to close all the ado.net object so there will be no memory leak
I have created an asp .net ajax control, meaning i have a javascript object linked to this control. In that object as usual i have 2 crucial methods: initialize and dispose.
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In internet explorer dispose method is invoked every time user leaves the page, even when closing the browser. But not in chrome, its invoked by refreshing the page but not by closing the tab or window. Do you know how to achieve this?
I have a MySQL data at a web hotel. I can connect to the database from my web application hosted at the hotel . But trying to connect from a client application running on my PC fails using the same ConnetionString. The error is: Unable to connect to any of the specified MySQL hosts
In fact the method below (the method is protected in the web application) fails in my client application but works in my web application.
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I just tried to download WorkBench 5.2 and HeidiSQL, both connects to the database from my PC when supplying server and password information.
We have a spreadsheet that has a Zip column. These zip has a plus 4 digit in this format 99999-9999. When I looked at the format of this cell, it was a Special format with Zip+4 type. I just need to get the 5 digit zip code but the problem I am running into is the leading 0s. I tried =LEFT(A2, 5) but this trims the leading 0s. I also tried highligiting the column, then DATA -> Text to Columns -> Delimeter with hyphen but that didn't work. Is there any other way to do this or am I missing something on my first two attempts. Please let me know if you need more clarifications.
View 4 RepliesI use SmtpClient to send email. I want to ensure that the SMTP connection gets closed after each message is sent. I found an explanation of how to do this in the SmtpClient documentation on MSDN:
[URL]
One thing it says is: Call Dispose when you are finished using the SmtpClient. The Dispose method leaves the SmtpClient in an unusable state. After calling Dispose, you must release all references to the SmtpClient so the garbage collector can reclaim the memory that the
SmtpClient was occupying.
I have a question about the last part. What exactly does "release all references" mean. How do I do that?
does DbCommand.Dispose() automatially close the database connection?
Here is my code:
Database db = DatabaseFactory.CreateDatabase("DBIS");
string sqlCommand = "procUIBillingAdjustmentsCreditInvoicedSegment";
DbCommand dbCommand = db.GetStoredProcCommand(sqlCommand);
DataSet ds = new DataSet();
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project was clean after release build, but when i ran "Run Code Analysis" i got 256 errors. the error below is one of them. will be great help. if anybody can explain, what is the meaning of this error?
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I have created my custom MembershipProvider. I have used an instance of the class DBConnect within this provider to handle database functions. Please look at the code below:
public class SGIMembershipProvider : MembershipProvider
{
#region "[ Property Variables ]"
private int newPasswordLength = 8;
private string connectionString;
private string applicationName;
private bool enablePasswordReset;
private bool enablePasswordRetrieval;
private bool requiresQuestionAndAnswer;
private bool requiresUniqueEmail;
private int maxInvalidPasswordAttempts;
private int passwordAttemptWindow;
private MembershipPasswordFormat passwordFormat;
private int minRequiredNonAlphanumericCharacters;
private int minRequiredPasswordLength;
private string passwordStrengthRegularExpression;
private MachineKeySection machineKey;
**private DBConnect dbConn;**
#endregion
.......
public override bool ChangePassword(string username, string oldPassword, string newPassword)
{
if (!ValidateUser(username, oldPassword))
return false;
ValidatePasswordEventArgs args = new ValidatePasswordEventArgs(username, newPassword, true);
OnValidatingPassword(args);
if (args.Cancel)
{
if (args.FailureInformation != null)
{
throw args.FailureInformation;
}
else
{
throw new Exception("Change password canceled due to new password validation failure.");
}
}
SqlParameter[] p = new SqlParameter[3];
p[0] = new SqlParameter("@applicationName", applicationName);
p[1] = new SqlParameter("@username", username);
p[2] = new SqlParameter("@password", EncodePassword(newPassword));
bool retval = **dbConn.ExecuteSP("User_ChangePassword", p);**
return retval;
} //ChangePassword
public override void Initialize(string name, NameValueCollection config)
{
if (config == null)
{
throw new ArgumentNullException("config");
}
......
ConnectionStringSettings ConnectionStringSettings = ConfigurationManager.ConnectionStrings[config["connectionStringName"]];
if ((ConnectionStringSettings == null) || (ConnectionStringSettings.ConnectionString.Trim() == String.Empty))
{
throw new ProviderException("Connection string cannot be blank.");
}
connectionString = ConnectionStringSettings.ConnectionString;
**dbConn = new DBConnect(connectionString);
dbConn.ConnectToDB();**
......
} //Initialize
......
} // SGIMembershipProvider
I have instantiated dbConn object within Initialize() event. My problem is that how could i dispose off this object when object of SGIMembershipProvider is disposed off. I know the GC will do this all for me, but I need to explicitly dispose off that object. Even I tried to override Finalize() but there is no such overridable method. I have also tried to create destructor for SGIMembershipProvider.
i want to develop a data access layer ,it can support multiple database like oracle ,Mssqlserver and Mysql using enterprise library and C#.net 3.5 based on database connection
View 1 RepliesI have a web site which uses one SQL database but the hosting company is very slow sometimes and I got database timeout, login and similar errors. Can I implement my code to use two databases simultaneously? I have stored procedures and the data is updated periodically.
EDIT:
Simply: When dbDefault is down and inaccessible I need to use dbSecondary so the web app keeps running. Ant these two databases must be always same.
EDIT:
Some errors:
A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.Cannot open database "db" requested by the login. The login failed. Login failed for user 'root'.