DataSource Controls :: Reading With DataReader Into List And OutOfMemoryException

Sep 23, 2010

I'm Using a DataReader to Read about 100,000 records, my code look like :

[Code]....

I have a per row computation in reading the rows on GetMyType2Info() method, and this method also another method that I return only one record by ExecuteReader(). the problem is that when the MyTypeList (List<T>) has about 21,000 Items of MyType (<T>) System.OutOfMemoryException is thrown. wanted to know how to resolve this and wanted to know more about the maximum size of List<T> capacity. in addition the execution of the main Query with 100,000 records take about 4 seconds in SQLServer a record has only types of nvarchar , float,datetime and int

View 1 Replies


Similar Messages:

Databases :: Reading Text File Into DataReader?

Jul 8, 2010

I'm trying to read data from a text file into a DataReader object using the following code but I get an exception:

OleDBException was unhandled.

Cannot update. Database or object is read-only.

Also, I would like to know if it is efficient to read data of a text file into a datatable instead of using StreamReader object and traversing through the recordset.

[Code]....

View 3 Replies

ADO.NET :: Reading A Segment Of Huge Varbinaty (max) Field By DataReader

Oct 19, 2010

I have a table with just a column and a row in a table that it save just a file with size 1.5 GB ! C# application and sql server are in different machines. I want to read that file by DataReader every 100 MB then save all 100 MB files to disk by "FileMode.Append" for file stream and collect them to one file.

View 1 Replies

DataSource Controls :: System.OutOfMemoryException - Cannot Execute Script / How To Fix Error

Apr 1, 2010

I am trying to run a script to build a database structure for open source app nopcommerce. When I try to run the script via sql management studio I receive and error (below). I am running sql express on the hosting server. I also have issues connecting via management studio directly to the sql server installation, but am able to connect via remote desktop. I dont know specifics about the installation since I was not the one to install it.

View 1 Replies

Forms Data Controls :: Binding Dropdown List Using Dataset Or Datareader?

Jan 25, 2011

- i have two drop down lists- ddl_SelectClient, ddl_SelectApplication

- when a client is selected in ddl_SelectClient, i have to show the list of the clients applications in ddl_SelectApplication

- i have written the below code in the ddl_SelectClient_SelectedIndexChanged routine to do the same

- i am getting the error("Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack") in the catch block when the ddl_SelectApplication gets binded

[Code]....

View 3 Replies

DataSource Controls :: Use A DataReader With SQL?

Mar 29, 2011

I have put a SQLDataSource on my page and everything is adjusted and it works properly. I read an article
here which was indicating that you can use a DataReader in order to get data from sqldatasource, but it doesn't say how, the only thing that is said is to use DataSourceMode property in order to adjust it for a DataReader.

View 1 Replies

DataSource Controls :: How To Load A DataReader

Apr 21, 2010

How do I load a datareader in a defult.aspx page using while using a database connection that is defined in the web.config file?

View 3 Replies

DataSource Controls :: Create ConnectionString Using SQL DataReader

Sep 11, 2010

why this first connection works but the second doesn't?

[Code]....

I'm trying to use <asp:FileUpload> to upload images and as far as I know you have to use <asp:SqlDataSource> to do it but I need to create the connections string using entries stored in a database.

View 2 Replies

DataSource Controls :: DataReader Telling Me It Needs To Be Closed

Jun 28, 2010

Dim sqlc1 As New SqlCommand("sp_navmenu 275,1,21", ERIKSDbCon)

View 4 Replies

DataSource Controls :: How To Evaluate Nothing Value Returned By Sql Datareader In Vb.net

Aug 24, 2010

When a sql query returns NULL , I can use the following code to evaluate:

[Code]....

When a sql query returns nothing, neither IsDBNull nor is Nothing works. I don't know why some sql queries return null while some return nothing when there are no data returned. But anyway, can somebody tell me how to evaluate nothing value returned in sql datareader in vb.net? When I put the cursor over signInfo variable in debug mode, I can see Nothing show as its value. But the line does not work

[Code]....

View 3 Replies

DataSource Controls :: How To Convert Datareader To Dataset

May 11, 2010

Any one can suggest a method to convert Datareader to dataset or any alternate method

View 7 Replies

DataSource Controls :: DataTable With DataReader Not Working?

May 17, 2010

dataTable with dataReader not working

[Code]....

View 3 Replies

DataSource Controls :: Datareader - Loop Through Results In VB?

Feb 1, 2010

I would like to loop through my result set and generate a menu structure like this:

pagetitle
pagetitle
subtitle
subtitle
pagetitle
pagetitle

So far I have the following code but it doesn't generate the menu?

While reader.Read()
' set title
sitetitle = reader.Item("siteName")
mydata &= reader.Item("pagetitle")
' check subtitle exists, if so, build menu, loop though subtitles somehow?
if not IsDBNull(reader.Item("subtitle"))
mydata = "<ul>"
mydata &= "<li>" & reader.Item("subtitle") & "</li>"
mydata &= "</ul>"
end if
End while

Qeury and result set below:

sql:

SELECT subpages.subpageid, pages.pageid, sites.sitename, sites.siteid, pages.siteid,pages.pagetitle, subPages.subtitle FROM pages LEFT JOIN sites ON pages.siteid = sites.siteid LEFT JOIN subpages ON subpages.subpageid= pages.pageid WHERE sites.siteID = 1 ORDER BY sites.siteid, pages.pageid, subpages.subpageid ASC

results:

subpageid | pageid | siteid | siteid | pagetitle | subtitle
NULL 1 SCHS 1 1 Sandwell Community Healthcare Services NULL
NULL 2 SCHS 1 1 About Us NULL
NULL 3 SCHS 1 1 Your Services NULL
4 4 SCHS 1 1 Equality and Diversity Team at SCHS 1111
4 4 SCHS 1 1 Equality and Diversity Team at SCHS 2222
4 4 SCHS 1 1 Equality and Diversity Team at SCHS 333
4 4 SCHS 1 1 Equality and Diversity Team at SCHS 44444
NULL 5 SCHS 1 1 Single Equality Scheme NULL
NULL 6 SCHS 1 1 Diversity Strands NULL
NULL 7 SCHS 1 1 Equality Impact Assessments NULL
NULL 8 SCHS 1 1 Quality and Safety Committee NULL
NULL 9 SCHS 1 1 Contact Us NULL

View 5 Replies

DataSource Controls :: DataReader.Read() Not Working?

Mar 16, 2010

I have used SqlDataReaders a million times. Someone, what is wrong with this code:

SqlConnection connection = new SqlConnection(connectionString);
try
{
connection.Open();
SqlCommand command = connection.CreateCommand();

[Code]....

I have checked this against similar classes and it is exactly the same, but this one doesn't work.

View 4 Replies

DataSource Controls :: There Is Already An Open DataReader Associated With This Command Which Must Be Closed First.

May 27, 2010

protected void Page_Load(object sender, EventArgs e)

View 7 Replies

DataSource Controls :: Retrieve Text Field Using Datareader

Feb 25, 2010

I have text field on a sql server table and I retrieve it on string variable using datareader : string result = reader["MyTextfied"] but I have this errors ( text or binary field cannot be troncated ) My text fied contains a large of text

View 5 Replies

DataSource Controls :: Manage A Datareader With Data Field?

Mar 25, 2010

i have a datareader who read from data field from sql server, this field is datetime format now, when this field is null it returns 01/01/1900!! how can i manage it without if or some check, is there a property in datareader or sqlserver properties who i can return null value from datetime field?

View 4 Replies

DataSource Controls :: Almost 2 Seconds To Read A Datareader Field

Apr 16, 2010

I use a SqlDataReader to get fron sqlServer a row af a table. This table have a text field where I store a Xml configuration. In one case this Xml grow up to 650Kb. When I get the field from the datareader it cost amost 2 seconds:

INFO 2010-04-16 09:46:40,559 [12] Cms.dataContenido - readed
INFO 2010-04-16 09:46:42,356 [12] Cms.dataContenido - XMLContent

This is my code:

[Code]....

View 1 Replies

DataSource Controls :: ODBC Datareader Is Not Working With DB2 Some Tables?

Jun 2, 2010

This is the code i am used for fetching data from DB2 server (windows based server)In the same server tables created by me is working fine...eg:

oCommand.CommandText = "SELECT * from DEB.TESTUSER";

below is a table created by another application but the data reader is not working with this query ( table in the same server with same DB as above)

oCommand.CommandText = "SELECT * FROM DEB.RULE_GROUP";

If any permission or any other things i want to check .....i mean security related.....odbcadapter is also working fine....pls help regarding the datareader.....below is the complete code......

private void btnSelectRecord_Click(object sender, EventArgs e)
{
OdbcConnection oConnection = null;

[code]...

View 3 Replies

ADO.NET :: Converting Datareader To A List?

Feb 17, 2011

In C#.I have a list<object>.

I want to convert any datareader result (with data) to a list of objects.

How can I do that?

View 6 Replies

DataSource Controls :: Reading Data From An SQL Query C#?

Feb 26, 2010

I don't know how to read data into variables from a SELECT query. I can add, update, and delete queries with no issues. I have browsed a few books, but everyone uses a different approach. Suppose I want to to run a query and 1 record is returned. How do I get the values into my variables.

Suppose my table name is "Job Orders", and the row returned has these 3 fields:

JobNumber, FirstName, Lastname

[Code]....

[Code]....

this is where I go blank ?

"I learn by doing, not by reading"

View 1 Replies

DataSource Controls :: Reading Information From Database?

May 16, 2010

I would like to check my database for to see if a user name is available but my script isn't working.

I am taking input from a text box call unametextbox and i'm trying to extract any matching username from the database, this is my code.

[Code]....

View 8 Replies

DataSource Controls :: Reading SQL Schema Information?

Apr 27, 2010

I have a C#/Asp.net web application which caches SQL DB schema information. Is there a way that I can determine what child relationships a given table has? I have looked into using the DataTable.ChildRelations property, but it is never populated with items unless i manually create a relationship using the .add property. I also have access to DataColumn information for each column in the database.

View 4 Replies

DataSource Controls :: MARS - "There Is Already An Open DataReader Associated With This Command Which Must Be Closed "

Feb 23, 2010

I am using MS SQL Server 2005 and i added "" to my connection string and i still have the problem

"There is already an open DataReader associated with this Command which must be closed" ;

SqlDataReader dr2;
StrSql = " SELECT * from Modules";
cmd.Connection = conn;
cmd.CommandText = StrSql; [code]....

View 1 Replies

DataSource Controls :: Reading / Storing Values Of Checkboxlist In SQL (VB)

Sep 22, 2010

I'm trying to store multiple selected checkboxes from a single checkboxlist, but i don't know where to start. Imagine i have three tables: tbl_events, tbl_organisors and tbl_settings and i want to store the organisors of an event. Each event can have multiple organisors, so each organisor should be added as a single row into tbl_settings. I know how to bind tbl_organisors to a checkboxlist, but how do i store the results (meaning: add the rows to tbl_settings) ?

tbl_events: Event_ID (PK) and Event_Name
tbl_organisors: User_ID and user_name.
tbl_settings: Settings_ID (PK), Event_ID and User_ID

Checkboxlist:

[Code]....

SQLDatasource:

[Code]....

Initially all checkboxes will be unchecked, but users must be able to select multiple organisors from the checkboxlist and then store them into the DB by submitting a form. So the query will look something like: INSERT INTO tbl_settings (user_id, event_id) VALUES (@user_id, @event_id). And this is where my head cracks

1) How do i loop through all selected checkboxes and store each value (user_id) in a new row in tbl_settings?
2) After saving, the users reloads the page and the organisors he just selected must be selected by default in the checkboxlist. How?

View 2 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved