Re: Caching In WinForm Apps etc. - C# Discussion Boards

drag and dropdown on a datagrid

topcatalpha22-Jun-07 2:57

topcatalpha

22-Jun-07 2:57

Hi,

Does anyone know how i can get the cell on which an item has been dropped.

thx,

Kurt

XmlDataSource

razanabanu22-Jun-07 2:23

razanabanu

22-Jun-07 2:23

Parser Error Message: Could not load type System.Web.UI.WebControls.XmlDataSource from assembly System.Web, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.

Source Error:

Line 56: <form runat="server" ID="Form1">
Line 57: <h3>AdRotator Example</h3>
Line 58: <asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="Ads.xml"></asp:XmlDataSource>
Line 59: <asp:AdRotator id="AdRotator1" runat="server" Target="_parent" DataSourceID="XmlDataSource1" />
Line 60: <asp:AdRotator AdvertisementFile="Ads.xml" ID="adHomepage" KeywordFilter="homepage" runat="server" />

Please help me to solve this problem...

Hi,Im Razana

Re: XmlDataSource

Colin Angus Mackay22-Jun-07 3:14

Colin Angus Mackay

22-Jun-07 3:14

A quick check of the .NET documentation reveals that the XmlDataSource class is only supported in .NET 2.0 onwards: http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.xmldatasource.aspx[^]

You are using .NET 1.0

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Ready to Give up - Your help will be much appreciated.

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Caching In WinForm Apps etc.

Andre Trollip22-Jun-07 2:18

Andre Trollip

22-Jun-07 2:18

Hi Guys,

I was wondering if there are any object to do caching with in .Net that is not web related. I don't quite get why Microsoft included caching for asp.net, in the System.Web namespace, if clearly caching is necessary in more places than just for serving web pages.

Any views on this? Maybe I'm missing something?

Phi?

Re: Caching In WinForm Apps etc.

Colin Angus Mackay22-Jun-07 3:15

Colin Angus Mackay

22-Jun-07 3:15

Try the Microsoft Enterprise Library Caching block.

Re: Caching In WinForm Apps etc.

Andre Trollip22-Jun-07 3:31

Andre Trollip

22-Jun-07 3:31

How do I use it? Where is it? Does it come with the .Net 2.0 library? If so, what namespace?

Thanks for your help.

Phi?

Re: Caching In WinForm Apps etc.

Sathesh Sakthivel22-Jun-07 3:42

Sathesh Sakthivel

22-Jun-07 3:42

Enterprise library[^]

Regards,

Satips. Rose | [Rose]

Re: Caching In WinForm Apps etc.

Colin Angus Mackay22-Jun-07 3:48

Colin Angus Mackay

22-Jun-07 3:48

Andr Trollip wrote:
How do I use it?

Read the instructions - It comes with a tutorial

Andr Trollip wrote:
Where is it?

Ask Google: Microsoft Enterprise Library[^]

Andr Trollip wrote:
Does it come with the .Net 2.0 library?

No.

Andr Trollip wrote:
what namespace?

Microsoft.Practices.EnterpriseLibrary.*

regarding crystal reports

fgfdhghgfd22-Jun-07 1:42

fgfdhghgfd

22-Jun-07 1:42

hi everybody,

i m using crystal reports of dotnet 1.1.my problem is that i have two table in one dataset and now in server side coding i m writing query in command text and using join in query,besides this i m using session value in on clause of join query but it it not giving required result.it seems that query not making any impact.query is right the result is it showing in query analyser is not showing in crystal reports.
please tell what would be the problem?

Output string with ""

Brendan Vogt22-Jun-07 1:19

Brendan Vogt

22-Jun-07 1:19

Hi,

I have a string variable called strField. An example result is:

FirstName

How do I add in code so that the output result is:

"FirstName"

Please can someone help?

Regards
ma se

Re: Output string with ""

Guffa22-Jun-07 1:26

Guffa

22-Jun-07 1:26

You use \" to put a quote in a string literal.

If you have the value in a variable:

strQuoted = "\"" + strField + "\"";

If you want to put the quotes in the original value:

strField = "\"FirstName\"";

---
single minded; short sighted; long gone;

Re: Output string with ""

Brendan Vogt22-Jun-07 1:44

Brendan Vogt

22-Jun-07 1:44

Thanks.

I forgot that I am busy with a VB.NET project, I normally do C#. But getting back to your answer I did like you said, but then VB.NET adds a space after the \, like in:

writer.WriteLine("\"" & strRow & " \ "")

Then I get the following error:

Input string was not in a correct format.

Please excuse the VB code in the C# forum.

Regards
ma se

Re: Output string with ""

Guffa22-Jun-07 2:43

Guffa

22-Jun-07 2:43

ma se wrote:
I did like you said, but then VB.NET adds a space after the \, like in:

writer.WriteLine("\"" & strRow & " \ "")

That's because you are trying to use C# escape codes in VB. You end up trying to divide the string "\" & strRow & " with the string "". VB automatically tries to convert the strings to numbers, that's why you get the error message about incorrect format. You should use Option Strict On to prevent that kind of automatic conversions.

In VB you escape the quote by putting another quote in:

writer.WriteLine("""" & strRow & """")

---
single minded; short sighted; long gone;

C# or .NET 3D Math Library

rsaint2722-Jun-07 0:56

rsaint27

22-Jun-07 0:56

Hello,

I'm trying to develop an application that handles 3D data and plots it using OpenGl.
Do you know of any good 3D Math library to use with c#?
For OpenGl I will try to use Tao Framework.

Thanks in advance

Just a c# newbie Smile | :)

Re: C# or .NET 3D Math Library

GrinderDev26-Jul-07 4:12

GrinderDev

26-Jul-07 4:12

I'm a bit late, but check out the book Practical C# Charts and Graphics by Dr. Jack Xu. Great book with some excellent 3d examples.

http://authors.unicadpublish.com/~jack_xu/

can u solve it

srinivassam22-Jun-07 0:51

srinivassam

22-Jun-07 0:51

i have dropdownlist ,it contains countries.
and also i have datagrid ,
if iam changing the country in dropdownlist i want locations of that country in datagrid.

private void dg1_SelectedIndexChanged(object sender, System.EventArgs e)
//code

srinivas

Re: can u solve it

Mali Perica22-Jun-07 0:58

Mali Perica

22-Jun-07 0:58

Simple. If DataTable is bound as DataSource to grid, make as many DataTables as you have countries, and then create HashTable or Dictionary where key is name of the country, and value is DataTable which contains all of the locations for that country. Then, when selection changes for dropdown control, you simply switch DataSource with new DataTable.

Re: can u solve it

Christian Graus22-Jun-07 1:02

Christian Graus

22-Jun-07 1:02

You could try a better subject line in future. Everyone wants someone to solve something here.

If the country list is in the database, you'd store the id of the country in the drop down list values, and then use it to read the locations from the database. If it's a static list, the hashtable idea works just as well.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: can u solve it

Nouman Bhatti22-Jun-07 3:01

Nouman Bhatti

22-Jun-07 3:01

load data in dropdownlist and set the valuemember and displaymember properties, then on selectedindexchanged query the database against the id of the country.. and load the data in datatable and bind the table with the grid

Do i have to remove the Events ?

MarkPhB22-Jun-07 0:19

MarkPhB

22-Jun-07 0:19

Hi,

Lets say i have an objekt with events ...

<code>
class TestClass {

   public event EventHandler TestEvent1;
   public event EventHandler TestEvent2;
   ...

   public TestClass() {}
}
</code>

and now i have one Main Form the works with that object...

class MainForm : Form {

   TestClass testObj;

   public MainForm() {
      testObj.TestEvent1 += new EventHandler(testObj_TestEvent1);
      testObj.TestEvent2 += new EventHandler(testObj_TestEvent2);
   }

   void testObj_TestEvent1 (object sender, EventArgs e){}

   void testObj_TestEvent2 (object sender, EventArgs e){}
}

and i have a second form the works with the object too, but not mainly. Thats why i start the second form with the instance of the object...

class SecondForm: Form {

   TestClass testObj;

   public SecondForm(TestClass obj) {
                  
      if(obj == null){
        throw new ArgumentNullException();
      }
  
      testObj = obj;
      testObj.TestEvent1 += new EventHandler(testObj_TestEvent1);
      testObj.TestEvent2 += new EventHandler(testObj_TestEvent2);
   }

   void testObj_TestEvent1 (object sender, EventArgs e){}

   void testObj_TestEvent2 (object sender, EventArgs e){}
}

My question is now...is the any thing i have to remove or destroy when i close the second form ?

maybe ...remove the added events from the testObj?

Re: Do i have to remove the Events ?

Christian Graus22-Jun-07 1:03

Christian Graus

22-Jun-07 1:03

testObj.TestEvent1 -= new EventHandler(testObj_TestEvent1);
testObj.TestEvent2 -= new EventHandler(testObj_TestEvent2);

Of course, it still fires in your main class, because you don't remove it there, an event is a chain, not a single call.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Do i have to remove the Events ? [modified]

MarkPhB22-Jun-07 1:18

MarkPhB

22-Jun-07 1:18

I dont use it like this, the MainForm keep the object and give it to the SecondForm. Because the SecondForm use other methods an events of the object than the MainForm does. The SecondForm close it selft when its done with its work . OK, i should remove the added events from the SecondForm.

But i didnt done this befor and got no execption wich would indicate, that i should do remove the added events. Confused | :confused:

Is it possible that the GC done that for me ?

-- modified at 7:48 Friday 22nd June, 2007

Re: Do i have to remove the Events ?

Luc Pattyn22-Jun-07 1:53

Luc Pattyn

22-Jun-07 1:53

Hi,

this is how I understand the situation:

if SecondForm does not remove the events, then SecondForm will not be garbage
collected as long as testObj is alive (which happens to be as long as MainForm
is alive).

Rationale: SecondForm adds event handlers to testObj's events; these handlers
include a "this" reference (pointing to SecondForm) since they call a method
(inside SecondForm) on the specific instance of SecondForm.
Therefore your instance of SecondForm is kept alive by testObj; closing
the SecondForm is irrelevant; Disposing it should lead to an ObjectDisposedException
whenever one of the testObj's events fires (again).

Conclusion: forgetting to remove event handlers can result in keeping a lot
of memory both occupied (i.e. alive) and useless (a form that has been closed
isnt very useful anymore). It resembles a memory leak.

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: Do i have to remove the Events ?

Martin#22-Jun-07 9:16

Martin#

22-Jun-07 9:16

Hello,

Additionaly to what Christian and Luc where telling you (which was 100% correct of course), I made the expirience that you also have to set the "testObj" to 'null'.
I would suggest to override the Dispose method of the SecondForm, where you remove the delegates and set it null.

All the best,

Martin

Get User Data from the Active Directory : recieving err:System.Runtime.InteropServices.COMException: The server is not operational

cksat122-Jun-07 0:10

cksat1

22-Jun-07 0:10

hi frined,

i just implement this code in web aplication, but it is throwing
"System.Runtime.InteropServices.COMException: The server is not operational"
exception, can u please help me to get out of this problem, my management aske me to display the fullname of the loged-in user which is in Active Directory, i don't know how to take this, please help me

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