ADO.NET :: How Does Data Retrieval Works For Linq
Mar 28, 2011
I was looking over the Create a Movie Database Application in 15 Minutes with ASP.NET MVC (C#), and it used entity framework and I saw this code.
[Code]....
I am just wondering, does this mean, this code actually downloads ALL the data from the SQL server for that table, and then filters where the Id matches, and then is stored in the var originalMovie? I have seen the "Linq to SQL", does this send this as sql query to the SQL server, and therefore only the relavent rows are returned from SQL server?
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Jan 16, 2011
I am getting
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When I run the SAME query in the SQL query program I get result within seconds, and in LINQ it takes forever and fails.
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May 11, 2013
I am developing one Main rdlc Report Say "C" with Subreports A and B.Each report getting Data with different Datasources(DataSets).When Data is not coming for SubReports A and B, report is generated but I am getting the error message as Data retrieval failed for the subreport, 'Subreport1', located at:LocationSubTrade.rdlc. Please check the log files for more information.
private void ProcessMainReport()
{
LocalReport reportContractNote = new LocalReport();
reportContractNote.SubreportProcessing += new SubreportProcessingEventHandler(prcProcessSubReport);
reportContractNote.ReportPath = ReportPath;
ReportParameter recipientIDConsoCN = new ReportParameter(strparamRecipientIDConsoCN, RecipientID);
[CODE]...
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Feb 21, 2011
I have developed a application using Visual Studio 2008 and SQLServer 2008. I have a page called "Billing Center" where i need to display more than 500 records in a gridview and the gridview has sorting enabled. If i limit the page size upto 10 only the gridview performs well but user requirement is to view atleast 500 records at once which is slowing down the gridview record retrieval process.
I am using the following C# code in code behind to sorting, paging and retrieval . Please guide me what am i doing wrong in this code and how to make it work with large data set.
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Apr 18, 2010
design pattern that works well with Visual Studio data tools against an MS SQL server; to retrieve a subset of an object's fields for all rows, and then on-demand retrieve the remainder for one row. I.E. just the small summary fields that I will serialize to a master grid view, then the larger properties including a large blob that I will render in a detail view. The performance hit from retrieving the large blob with the master result list would be too great.
The data shape is static, and I can define two separate data classes to match the specific summary vs. detail information returned. However that sounds anti-pattern-ish, to define the data classes specifically to suit the presentation layer. It also presents another problem, how to translate from the summary item to the detail item in an object-oriented way?
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Mar 21, 2011
what the equivalent datatype of sql server timestamp in VB.NET,and How to retrive the exact value of timestamp from sql server in vb.net.?
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Dec 21, 2010
In our organization we had to write code to store and retrive documents in many apps. Now I would like to write a service/library that can be used my other devs. Not sure how to start about that? What should be my first step.
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Feb 7, 2011
I have been following various guides online and they seem to be great and i learning a great deal and i have my learning set out however i have come across a stumbling block "yet again"
I was following Mikes SQLce image upload guide and I got it, I understood it all "in theory"
[URL]
however what i couldn't figure out is when i want to display that image on a separate page or pull it back into a webgrid it just showed me SystemByte[] and not the image. Or a long string of writing that started -System........
I tried stripping Mikes code thinking well he is pulling the Image from the DB once the postback is done so why cant I do it on another page or in another <Div>. ?
If im not mistake it has somthing to do with this line
Response.BinaryWrite((byte[])file.FileContent);
Here is mmikes code:
[code]...
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Apr 25, 2010
I had a web application. We needed to move it to anotherserver, after we moved that, the membership database (aspnetdb) did not work.....finally i solved the problem, and now I have another problem. although in the web.config enablepasswordretrieval is set to true, and the type is clear, i get error in password retrieval.
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Jan 11, 2010
What is the best approach to storing images in a file system. Currently I am separating the images by day, month and then year. I am also hashing file name so that no two files will be stored with the same name. Lastly, how would I go about using the image file address in a forum?
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Aug 5, 2010
I have to know how to achieve the following senario in an web application,I have a search functionality, where i will give some parameteres which are used as input to my select query in sql database.
Once i click the start search button the parameters will go to database and execute the query. and display the result in application.If i click the Stop Search, i want to retireve the records which are available till that time. How can this be achieved in .net
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May 5, 2010
By default the Password Recovery control requires the username to send the user the login details. Is there any way I can configure it to work with either the log in name and email address or failing that just email address?
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Mar 8, 2011
I have a search box on a web application that is to use a query I have built in Access to search through projects to find any that are related to the text entered in the search box.
The query in Access is just made up of parameters that use wildcards to search through all the fields. In Access the query works fine and returns the correct data but when I try and link this all up to a ListView in Visual Studio, the ListView just diplays the message "No data was returned"
Below is my page-behind code, hopefully you can see why it is not working but it looks like it should work to me.
[Code]....
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Jul 19, 2010
SqlDataSource1.SelectCommand = "Select (Select Value from tbl_PaymentDetails where AttributeName = 'Credit card number') As Creditcardnumber From tbl_PaymentDetails";
//"Select * from tbl_PaymentDetails";
DropDownList3.DataSource = SqlDataSource1;
DropDownList3.DataTextField = "Creditcardnumber";
[code]...
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May 28, 2010
I'm looking to translate an SQL query into linq
INNER JOIN Usrs ON
SAQ.UserId =
Usrs.UserId AND Scan.UserId =
Users.UserId
I'm not sure how to include the "AND" in the LINQ statement.
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Jan 12, 2010
I'm creating a custom databoundcontrol which can present two different views depending on the value of a property called Mode. In the first I have a repeater inside, the other one a checkboxlist. I've choosen to inherit the CompositeDataBoundControl. It's bound using DataSource (not DataSourceID). When the Mode property changes I would like the control to rebind the control, so that the view is updated. I therefore call the OnDataPropertyChanged which according to the description should do the work, but nothing happens.
How does the OnDataPropertyChange really works? Do I still need to call DataBind() somewhere and where would be the best place to put it? It works perfect if I call databind instead of calling OnDataPropertyChanged but Im just not sure Im following the correct pattern. As a second question, when using DataSource rather than DataSourceID, is it correct to assume that DataSource is set when ReBind is required or should I implement logic to request the datasource?
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Feb 9, 2010
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now, I added information to the <headertemplate><table><tr><td>headers</td></tr></table></headertemplate>
and my label in the <itemtemplate><asp:Label id="Label1" runat="server"></asp:label></itemtemplate>
and now when I run my same code, I get [object reference not set to an instance of an object]
what gives? It was working until I added a header template.
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Apr 14, 2010
I have the below code that works for an asp.net repeater but I need to convert the logic so it works for an asp.net listview control...possible? Unfortunately, the same code throws errors when placed within my listview's itemdatabound event.
[Code]....
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Feb 9, 2011
I have this weird problem that sometimes happen to me. I have gridview with some columns, one of them is for a textbox. So I want when user click to edit the row, that textbox will get focused. What I used is simply: type(gridV.Rows(e.newEditIndex).FindControl("TB"),TextBox).Focus(). However, only when I click on odd rows that it works. When I click on even rows, the row change to edit mode but somehow its RowState still state Normal.
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Mar 22, 2010
i have a gridview that binds data after changes were made (delete,update..) and it's all done with the c# method DataBind() and i don't know why FF shows the changes but in IE8 the grid remains the same and only if i navigate back and refresh, then i see the changes.
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Jul 28, 2010
I have 3 nested repeaters for a dropdown js menu.
<asp:Repeater ID="Repeater1" OnItemDataBound="rpaltmenu" runat="server">
<ItemTemplate>
<li>
<a href="<%--<%#"sirt.aspx?anamenuid="+Eval("menuid") %>--%>"><div align="center"><img border="0" src="<%#Eval("ikon") %>"><br /><%#Eval("menuadi").ToString() %></div></a>
<ul>......
code is ok but works only one time and my last menu items are being loaded only for one time.The first items are ok but after that it is not working.
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Oct 25, 2010
I have a Datagrid control in my webform, which directly pulls out data from our database.
For each row, I have a custom button at the last column. Its looks like:
[Code]....
What it does is it simply opens a new window with the row information.
The problem is, this button works with 2 clicks, not one click
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Oct 18, 2010
I have a ListView that uses an ObjectDataSource
When I add a DataPager control INSIDE the ListView, it works fine and the ListView's PagePropertiesChanging event fires.
When I move the DataPager OUTSIDE the ListView control and set its PagedControlID
to the ListView, it stops working and the ListView's PagePropertiesChanging event no longer fires.
i.e. This works (and the ListView's PagePropertiesChanging fires):
[Code]....
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Mar 31, 2011
I have a dropdownlist with multi-select which I am using to filter a gridview. My problem is it only uses the first selected item for filter.
If I select one works fine, if I select 2 items the grid is filtered by the first item selected.
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Feb 12, 2011
I have a gridview with a hyperlinkfield inside of it. There is a dropdownlist that re-databinds the gridview onselectedindexchanged. I'm using the datanavigateurlformatstring attribute of the hyperlinkfield to make the url, and in in most cases it works as it should. HOWEVER, when one particular item is selected from the dropdownlist the associated links that are supposed to be created in the hyperlinkfield do not work. They arent actually clickable. In the source they have no href (which is what the datanavigateurlformatstring is supposed to set along with datanavigateurlfields). I have debugged to see that before and after databinding the information going into the control is correct, but still it doesnt work. In every other case it works.
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