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- 1
- Winforms >> A Newbie QuestionHi All,
I'm trying to develop a prototype for a small Room Booking application. This
is a 3 tier application. The presentation layer consists of Windows Forms.
There will be multiple concurrent clients. The application needs transaction
supportivity.I thought of developing in .NET C#. The data base is going to
be SQL Server 2000.
I thought of following the design guidelines mentioned in the
MSDN,Application Architecture for .NET Designing Applications and Services
from Microsoft
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html
/distapp.asp).
I have some questions. For my distributed application which technology would
be best suitable?. Enterprise Services COM+ components or .NET remoting or
Web Services? How can I take the decision? My application needs quick
response (Speed is important).
Thanks in advance.
Regards,
Risath
- 2
- Visual C#.Net >> Create a string of n pixel width...Since I have no control over a treeview's scroll bars (i'm drawing icons
and text to the right of the treenodes) I've decided to just add some
special text to the end of my tree node text which I will then strip out
when it comes to drawing the treenode into the treeview...
Anyway I know there is a way to get the pixel length of a string that
already exists, but is there a good way to create a string of characters
that are a certain length? Should I just have a function that loops
adding 'x' until it's a certain length? Since this will only be run
when a node is created or when a node's special properties change I'm
just planning on doing this - unless any of you know of a better solution.
Thanks,
Benny
- 3
- 4
- Net Framework >> Debugging a server appHi,
I am having the following event logged when I try to debug a COM+ server
application:
"The server {54AD3709-9B43-42A8-B896-404FDCF4AC85} did not register with
DCOM within the required timeout"
I also get a dialog box saying "An error ocurre while processing the last
operation. Error code 8008005 - Server execution failed. The event log may
contain additional troubleshooting information".
And all I am doing is:
I go to the Component Services Explorer and I Start the COM+ application.
This opens an instance of VS.NET 2003 containing dllhost.exe.
My intention is to be able to debug the components in that COM+ server app.
--
Thanks in advance,
Juan Dent, M.Sc.
- 5
- Visual C#.Net >> No parameterless constructor defined for this object**************************************
//Load the Assembly
Assembly a = Assembly.LoadFrom(sAssembly);
//Get Types so we can Identify the Interface.
Type[] mytypes = a.GetTypes();
BindingFlags flags = (BindingFlags.NonPublic | BindingFlags.Public |
BindingFlags.Static | BindingFlags.Instance | BindingFlags.DeclaredOnly);
//Iterate through the Assembly to find Class with a Public Interface.
//****Each Assembly should only have one Public Entry Point****
//****using this method to expose that method and pass the XML data to it****
foreach (Type t in mytypes)
{
MethodInfo[] mi = t.GetMethods(flags);
Object obj = Activator.CreateInstance(t);
**************************************
I am trying to dynamically call an assembly. The Assembly name is being
pulled from a SharePoint List and in this case it is called TransformXML. I
am getting the following error when it gets to the Activator...
ERROR:
**********************************************************
*An unhandled exception of type 'System.MissingMethodException' occurred in
* *mscorlib.dll
*
*
*
*Additional information: No parameterless constructor defined for this
object *
**********************************************************
I am also including the code from the class being called.
Transform.dll
**************************************************
public class CreateTransform
{
#region Public Methods
public CreateTransform()
{
}
public CreateTransform(string sXML, Microsoft.SharePoint.SPListItem
_spListItem)
{
//System.Xml.XmlDocument xmlDoc;
Microsoft.SharePoint.SPAttachmentCollection spAttachColl =
this.GetXSLTransform(_spListItem);
this.TransformXML(sXML,spAttachColl);
}
#endregion
- 6
- Winforms >> Tab key in a datagrid on a modeless dialogHello
I have a datagrid on a modeless dialog and when the focus is on the datagrid
the tab key doesnt work. Now, I understand that when you have a modeless
dialog then there is some kind of message loop missing and that is why the
tab key doesnt get captured. That is why I though I could inherit my own
datagrid and override the ProcessKeyPreview to capture the Tab key. This
only works with the Enter key though. The Tab key never gets sent to the
DataGrid. Does anyone know where the tab goes? Do I have to use the textbox
column in some way to get hold of this one. I also wonder why the Enter key
is seen by the datagrid but not the Tab key.
Thanks for any input
/Peter
- 7
- 8
- 9
- ADO >> How do I detect a DBNull in a strongly typed DataSet?Although I am able to set a DateTime column to null, it throws an error when
I attempt to test for null... example
Column set to null as follows:
private void InitializePriorsPostedThruTest()
{
object[] key = {cbAgencyID.Value.ToString()};
TwsDS.twsAgencyRow r = (TwsDS.twsAgencyRow)
twsDS1.twsAgency.Rows.Find(key);
r.SetPriorsPostedThruNull();
}
And test for it here (Will ultimately be checking for dates that have been
set):
private void cbAgencyID_RowSelected(object sender,
Infragistics.Win.UltraWinGrid.RowSelectedEventArgs e)
{
object[] key = {cbAgencyID.Value.ToString()};
TwsDS.twsAgencyRow r = (TwsDS.twsAgencyRow)
twsDS1.twsAgency.Rows.Find(key);
if (r.PriorsPostedThru.Value == DBNull.Value)
MessageBox.Show("Null detected");
}
- 10
- ADO >> Batch Update ProblemHi,
I am porting an ADO.NET 1.1 project to version 2.0 and trying to take
advantage of the dataAdapter's UpdateBatchSize property. When I set this to
0 and change my updatedRowSource to either NONE or OUTPUT PARAMS, I get the
following error when trying to update more than one row.
5/10/2006 12:52:18 - Exception occurred ---> Description:
ExceptionHandling.CustomException: The ConnectionString property has not been
initialized. ---> System.InvalidOperationException: The ConnectionString
property has not been initialized.
at
System.Data.Common.DbDataAdapter.UpdatedRowStatusErrors(RowUpdatedEventArgs
rowUpdatedEvent, BatchCommandInfo[] batchCommands, Int32 commandCount)
at System.Data.Common.DbDataAdapter.UpdatedRowStatus(RowUpdatedEventArgs
rowUpdatedEvent, BatchCommandInfo[] batchCommands, Int32 commandCount)
at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows,
DataTableMapping tableMapping)
at System.Data.Common.DbDataAdapter.UpdateFromDataTable(DataTable
dataTable, DataTableMapping tableMapping)
at System.Data.Common.DbDataAdapter.Update(DataTable dataTable)
My update method is as follows. I initialize the data adapter's update
related sql command objects' connections at run-time. (I am not using
'USING' as I want to catch exceptions)
Private Sub DoUpdate()
Dim cn As New SqlConnection(strConn)
Me.dataAdapter1UpdateCommand.Connection = cn
Me.dataAdapter1DeleteCommand.Connection = cn
Me.dataAdapter1InsertCommand.Connection = cn
Try
Me.dataAdapter1.Update(Me.Ds.dtMyTable)
Catch ex As Exception
LogExceptions(Me.Name, "DoUpdate", ex)
MessageBox.Show(strChgError, strSrvrError, MessageBoxButtons.OK,
MessageBoxIcon.Error)
Finally
cn.Dispose()
End Try
End Sub
Can anyone tell me why this happens and how to fix it. I can correct the
problem by setting the updateBatchSize to 1, and the problem does not occur
when only one row is being updated. I am connecting to SQL Server 2000 SP4.
Thanks.
--
John
- 11
- Visual C#.Net >> OOD QuestionThis is a design / inheritance qus.
I have class Task.
This is a base class for some specific tasks
Say
WorkOrderTask : Task
TimeSheetTask : Task
Now Task has a function GetDetails() which gets all info about task. This
makes a database call.
I override this in the derived class. For implementing this in derived
class i see following 2 approaches.
Approach 1. WorkOrderTask .GetDetails()
{
Calls base.GetDetails(); to get base details, populates in the
object
Gets details specific to WorkOrderTask, populates in the object
returns;
}
Approach 2. WorkOrderTask .GetDetails()
{
Get details specific to WorkOrderTask as well as the base class
details, populates in the object
returns;
}
The problem with
Approach 1
I have to make 2 database calls.
Approach 2
If theres some change in base class I need to take care of these in all the
derived classes as well.
Whereas, Approach 1 is advantageous here as by modifying only the
Task.GetDetails funciton ( this is the base class ) function i have all the
values and i do not need to touch the derived classes.
Was thinking this might be a very common problem, so perhaps many of might
be able to guide me on the approach i must take here. Perhaps anything other
then the two i have talked about.
Thanks in advance
Sourabh
- 12
- Visual C#.Net >> OO AnalysisAlright, I've read Jesse Liberty's book almost cover to cover. So now I
know something about using C#. I have an idea for a program I want to
write.
I have NO IDEA what objects I need, or how to set things up. Are there
any good object-oriented books or website tutorials on ANALYSIS that you
would recommend? I need something that will teach me to diagram and
organize my thoughts.
The program I want to write transfers certain files and directories from
one PC to another. It seems I need a source computer object and a
destination computer object. Beyond that, to what level should I
extrapolate objects? Should I have a log object, for instance? Surely,
I wouldn't have an object for each program I want to copy (I was
thinking of doing an enumeration for software). I need to know where to
draw the lines.
-KV
- 13
- Visual C#.Net >> trouble witch using struct from C dllHello, I'm a "expert of beginner" in C#.
I have a dll - in C. And in this dll is this struct:
typedef
struct msg_s { /* please make duplicates of strings before next call
to emi_read() ! */
int op_type; /* of "op_t" type: operation type; submit (>0), response
(<0) */
union {
struct {
const char* from;
const char* to;
const char* notif_addr;
int notif_type; /* not_t */
const char* validity; /* DDMMYYHHmm */
const char* timestamp; /* DDMMYYHHmmss */
dst_t deliv_status;
int deliv_reasoncode;
const char* deliv_timestamp; /* DDMMYYHHmmss */
const char* text;
int priority;
int bit8; /* data coding scheme */
int numbits; /* number of bits in TD (text) if bit8=1 */
int msg_class;
int rpid; /* rpid == -1 => use RPID value "0000" */
/* rpid == 0 => do not use RPID value */
const char* xservices; /* extra services */
} submit;
struct {
int ack;
int errcode;
const char* sysmsg;
} response;
} uu;
} msg_t;
How can I use this struct in C#?
How can I make in C# the same code as is in C:
msg_t* msg = 0;
msg = emi_msg( emi); //emi_msg is a function whitch return a pointer
optyp = msg->op_type;
Thanks a lot
Pavel Spaleny
- 14
- Dotnet >> Strange, intermittent "Configuration Error" involving a COM DLLI have a Dot Net project that references a COM DLL called
"Crypto.dll," which is registered on my machine. I added the reference
via the "Add Reference" dialog in Visual Studio Dot Net, and I am
successfully accessing methods in this DLL in some of my classes.
"Interop.CRYPTOLib" is the name of the interop VS.NET created for me
when I added the reference.
Frequently, when I try to run my application, I get the error that
follows.
What's very frustrating and puzzling is that sometimes this error
occurs and sometimes it doesn't; it will occur 10 times in a row, then
I'll walk away from my desk for 15 minutes, and the application will
run fine.
Rebootimg my machine always seems to fix the error, but only for a
short period of time; it always recurs eventually.
Any help that anyone could give me on this would be greatly
appreciated...I'm really stumped! Thanks in advance!!
--JB
---------------------------------------------------------
HERE IS THE ERROR:
Configuration Error
Description: An error occurred during the processing of a
configuration file required to service this request. Please review the
specific error details below and modify your configuration file
appropriately.
Parser Error Message: Access is denied: 'Interop.CRYPTOLib'.
Source Error:
Line 196: <add assembly="System.EnterpriseServices,
Version=1.0.5000.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a"/>
Line 197: <add assembly="System.Web.Mobile, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
Line 198: <add assembly="*"/>
Line 199: </assemblies>
Line 200: </compilation>
Source File: c:\winnt\microsoft.net\framework\v1.1.4322\Config\machine.config
Line: 198
Assembly Load Trace: The following information can be helpful to
determine why the assembly 'Interop.CRYPTOLib' could not be loaded.
=== Pre-bind state information ===
LOG: DisplayName = Interop.CRYPTOLib
(Partial)
LOG: Appbase = file:///C:/Inetpub/wwwroot
LOG: Initial PrivatePath = bin
Calling assembly : (Unknown).
===
LOG: Policy not being applied to reference at this time (private,
custom, partial, or location-based assembly bind).
LOG: Post-policy reference: Interop.CRYPTOLib
LOG: Attempting download of new URL
file:///C:/WINNT/Microsoft.NET/Framework/v1.1.4322/Temporary ASP.NET
Files/root/8073f566/7100ac34/Interop.CRYPTOLib.DLL.
LOG: Attempting download of new URL
file:///C:/WINNT/Microsoft.NET/Framework/v1.1.4322/Temporary ASP.NET
Files/root/8073f566/7100ac34/Interop.CRYPTOLib/Interop.CRYPTOLib.DLL.
LOG: Attempting download of new URL
file:///C:/Inetpub/wwwroot/bin/Interop.CRYPTOLib.DLL.
LOG: Policy not being applied to reference at this time (private,
custom, partial, or location-based assembly bind).
LOG: Post-policy reference: Interop.CRYPTOLib, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.573;
ASP.NET Version:1.1.4322.573
- 15
- Visual C#.Net >> custom logging sink for logging application blockI have written a custom logging sink for the enterprise library logging
application block (June 2005). I have been able to configure it as expected
from the UI config tool (EntLibConfig.exe).
I have built a console application to test it with and I am getting the
following error message write to the default trace log when I attempt to use
my custom logging sink.
'An error occurred while the Distributor was processing the message. Please
check your configuration files for errors or typos. Verify that your sinks
are reachable (queues exist, permissions are set, database exists, etc...)'
This might be security related can anyone give me the answer on how to fix
this?
I can see from VS that the module for my custom logging sink is loaded at
runtime but I am unable to break into the assembly which indicates to me
that any of the 'LogSink' overridden methods are not being called.
Cheers
Ollie Riches
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Message |
Fritz135
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Dotnet >> passing array f structures
I need help. I cannot find any documentation to inform me of what I need to
do. I have an array of structures of strings that I pass to unmanaged C code.
The C code popuates the array, but in the VB code I only get the
base,subcript 0, and the rest is gone. My question is, how do I pass and
return an arry of structures.
Does VB pass a pointer to a one-dimension array of pointers in such case?
help will be greatly appreciated
DotNet159
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Index ‹ DotNet ‹ Dotnet |
- Next
- 1
- Dotnet >> SOLVED: TreeView with 3-state checkboxes (empty, checked, gray checked)Often we need to make a TreeView with checkboxes that have more than 2
states. Consider for example the TreeView of files and folders in a tape
backup program. If the subordinate nodes of a particular node are partly
checked and partly unchecked, then the node itself has a gray checkmark.
I've hit on a way to do this with pure .NET functions, without using Win32
HitTest. See:
http://www.covingtoninnovations.com/michael/blog/0506/index.html#050621
I can't release my code because it's for a commercial client, and indeed it
isn't all written yet, but I hope the description on that web page will be
enough to get people started. Enjoy!
- 2
- 3
- Visual C#.Net >> Read Text From Stream Then Reposition And RepeatThanks to all...
I need to read a block of text, operate on the read text then move to the
next text block and so on and so on from a 650MB file.
Pseudo code would be something like this:
1. Start at the beginning of the text file
2. Read in 100K of text
3. Work with the 100K of text
4. Repostion the cursor to the start of the next text block (position now
100001)
5. Read in 100K of text
6. Work with the 100K of text
7. Repostion the cursor to the start of the next text block (position now
200001)
8. Read in 100K of text
9. etc
I'm thinking that I need to use the StreamReader.Read function. Is this the
best approach? What approach will be the fastest?
Thanks very much
-- ty_92648 AT hotmail.com
- 4
- Visual C#.Net >> Serailizing to a MemoryStreamWhen I use the DataSet.WriteXml using a XmlTextWriter to a MemoryStream,
when I try to read the stream back into a DatasSet using ReadXml I get an
error indicating the root not is not avaialable. However if I write from
the MemoryStream to a file then read the file into a DataSet it works as it
should.
Couldn't find any reference to this onMSDN or the usual C# sites.
Thanks.
Ashleyb
- 5
- Visual C#.Net >> Problem with WWW and .NETHi
I don't know what I do wrong and what I have to do. I installed a new
instance of system with Internet Information (server WWW) and .NET framework
with Visual Studio. Now I have a problem because my WWW doesn't see ASP.NET
files. It ignore *.aspx and doesn't see ASP.NET applications. I reainstalled
Internet Information service but it doesn't work.
In a properties of any WWW applications, on a Documents tab I see only
documents with .asp and .htm extensions but I don't see *.aspx.
What I have to do ?
Thank's for all
Boniek
- 6
- Net Framework >> Compile warning???Hi
When i compile my app i get the following warning... not sure how to get rid
of it. I have removed and added my 'Reference' back in but it didn't change
anything.
Warning: The dependency 'MyDLL, Version=1.0.1672.16368, Culture=neutral' in
project 'MyApp' cannot be copied to the run directory because it would
overwrite the reference 'MyDLL, Version=1.0.1706.30700, Culture=neutral'.
Regards
Darryn
- 7
- Dotnet >> Help with the magically instantiating collection classHi everyone,
I posted a question earlier about a collection class that I'd made seemingly
getting instantiated magically after a class that contained a variable of
that type had its constructor called.
The constructor didnt touch the collection class and defineately didn't
initialise it.
Some one suggested the following reason as what is happening.
If anyone can help with what I've said down below i'd be very greatful:
Thanks
> Field initialization
> The initial value of a field, whether it be a static field or an instance
> field, is the default value (§5.2) of the field's type. It is not possible
> to observe the value of a field before this default initialization has
> occurred, and a field is thus never "uninitialized".
I'm not really sure what to make of that. How come, if I dont initialise, by
means of a constructor, a string for example - its null until I give it
something?
Thanks
- 8
- Net Framework >> Assembly dependency in a three-tier webapplicationI`m developing a three-tier webapplication using stored procedures as my
method for accessing my database. In Visual Studio I have a web project, a
business logic project and a data-access project, each resulting in its own
dll.
Now lets say I wantet to update my data-access layer to use standard ansi
sql queries. Is there a way of implementing this architecture that allows my
to update only a single .dll on a client server without the project crashing
miserably.
I have tested this idea, but I can't get it to work. When I overwrite my
existing data.dll with a new one my businesslogic layer crashed with the
error:
The located assembly's manifest definition with name 'Minas.Data' does not
match the assembly reference.
How do I solve this? There has to be a way.... either by using another
architecture from the get go, or my some other means ... I cant't see the
point of splitting the layers into different projects in visual studio if I
can't update them seperately...
Am I missing something? Is there a better way of solving my problem?
- 9
- 10
- Dotnet >> ClickOnce DeploymentWe are planning to use an executable along with Bootstrapper to handle
installation checks with ClickOnce. I dont see any option to specify the
install condition for the application that is deployed, even with the
bootstrapper I can just specify the install condition for the prerequisite
bundled along with the application getting deployed. So we have decided to
make a dummy installable and attach an external executable
(InstallConditionChecker) that could do the installation check and return the
appropriate exit code so that the installation can proceed / halt.
i understand there are some samples that talks about having a seperate
executable to do the install condition checks, but I dont get exactly how the
other executable is shipped to target machine
eg dotnetchk.exe that does the prerequisite check before installation of
dotnetframework
- 11
- Net Framework >> What replaced the .dep file in Visual Studio?We have been informed by one of the software tools vendors who produced the
Outlook interface software we are using, that to correctly registed a dll,
we need to "modify our .dep file and include something like:
Register=$(DLLSelfRegister)
in that file."
It is our understanding that this is Visual Basic 6 'talk'. Can anyone tell
us how to do the same thing in Visual Studio Setup projects????
Regards and thanks
Glyn Meek
- 12
- Visual C#.Net >> How to send an e-mailI have a service that needs to send e-mail alerts. I have been attempting
to use the System.Net.Mail function from .NET but this seems to require the
IIS be installed and running. Since some of my customers are not really
happy with having the IIS installed, not being used except to send e-mail
this is becoming a problem.
I have also tried using a little program from code project for sending
e-mail which works great on older servers but does not work on newer servers
because security which I don't have time to resolve.
Is there a better/easier way of doing this?
Regards,
John
- 13
- 14
- Dotnet >> SP2 Causes Access Denied When CompactingHi,
We have an application that uses an Access 2000 MDB file to store various
data, a customer had a problem where during the compaction routine the
database was corrupted, they informed us that they had just upgraded to XP
SP2.
We upgraded the developemnt VPC to SP2 and this throws a message to say
access is denied to the file but does not corrupt the database, we have
switched the firewall off but this makes no difference.
We are using the JRO.JetEngineClass method to do the compaction.
Any ideas?
Cheers Dave
- 15
- Dotnet >> help w/the line in Visual C++ 2005 ExpressVisual C++ 2005 Express
MVP's and experience programmer's only please!...
I need to get the number of lines in a textbox so I can insert them into a
listview. The text comes from my database and is unformatted. I display the
text to my user in the listview. The textbox I create logically in the
program, and I initialize the correct properties for a normal multiline
editor.
When the user changes the column size then I reload the lines accordinally.
The problem I am having is when I get the lines property which is a
array<^>^(). The lenght is always 1 no matter how many lines are in the
textbox.
In MFC when the lines are wraped the new line character is automattically
inserted, but here it's not.
Can you help me solve this problem? I would really appreciate it!
Thanks!...
--
Eric Miller
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