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Consider that we get the data in a dataset which is displayed to the user in the datagrid. When the user makes some changes or updates this data, I directly update the database and reload the data into the dataset and datagrid. Is it possible to update all the changes to the dataset and directly post the changes in the dataset to the database? If this is possible, does it take less time to process than the normal process of updating the database?
With Best Regards,
Mayur
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Hii
You can use Update method of the DataAdapter and AcceptChanges method of DataSet to update the data source.
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i have 2 tables A and B
is it possible in sql to get from B the last occurence (based on date) for each record in A?
ex
A
cust1
cust2
B
cust1 01012006 10.00
cust1 01022006 20.00
cust2 01022006 30.00
cust2 01032006 40.00
output
cust1 01022006 20.00
cust2 01032006 40.00
tnx in advance
maytel
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Please check is it work or not:
Select custID, Max(date field) from B
group by custID
Where custID in (Select Distinct custID from A)
Mahbub8957
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i forgot one detail
let me rephrase
is it possible in sql to get data from B (based on date SPECIFIED by the user) for each record in A?
date specified by user 01012006
A
cust1
cust2
B
cust1 01/01/2006 10.00
cust1 01/02/2006 20.00
cust2 12/31/2005 30.00
cust2 01/03/2006 40.00
output
cust1 01/01/2006 10.00
cust2 12/31/2005 30.00
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Your question is not very clear, but I think you want somthing like this:
select b.* from b, a where a.user = b.user and b.date = '01/01/05';
Matthew Hazlett
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Join in the B table and filter out the dates after the specified date. Group by the fields in the A table and use max() to get the latest date from the B table.
---
b { font-weight: normal; }
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I have some problem with smart tags. In my Smart tag action I am loading an XmlDocument with more than 100 KB of data. When the event is fires the system is not responding. Is there any limit for the Response packet? I am using Visio/Word as my Host application. It works fine when the size is below 50 K.
Any idea?
Thanks in advance.
Gokulan Venat
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Pls help, how to customize datagrid..... thanks...
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Do you want to specify HOW you want to customize the DataGrid, or are we just supposed to guess at the couple hundred things you could do to it? Not to mention, you didn't say WHICH DataGrid - Windows Forms DataGrid, Web Forms DataGrid? VB.NET 2002, 2003, or 2005?
At this point, the only thing we can do is direct you to a search for "Customize DataGrid[^]".
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
I'm experimenting with VB.NET 2005 Express. I want to write a VB.NET front end to repeatedly call a console application.
My question is: How can you pass command line parameters to and execute a console Application from VB.NET? Specifically, how to pass the command line parameters, execute the cosole application and then test to see when it has completed?
I found this sample code in the VB.NET help. It calls the console app but I need some help with how to pass command line parameters and test to see if the cosole application is done.
' (2) Call a Visual Basic run-time function (Shell), discard the return value.
Call Shell("C:\WINNT\system32\calc.exe", AppWinStyle.NormalFocus)
Anyone? Thanks.
-- modified at 21:14 Tuesday 24th January, 2006
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The Process[^] class has everything you need. Note the events that the class exposes too.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Thanks RageInTheMachine953,
This works quite nice. How can you test to see when the process is completed?
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You don't test. The Process class has an Exited event. ALl you do is create the event handler, wire it up with AddHandler, then set EnableRaisingEvents on the Process object that you're using to launch this tool of yours. Then you call .Start on that object.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
Here's a tricky one - I have a standard datagrid class derived from the DataGrid object. I'm then using that in a user control and placing that user control on one of my forms 4 times to give 4 datagrids. Of the 4 datagrids only one is editable and so I want to handle the editing event in the form rather than in the user control or my custom datagrid class as I need to use data current in the form.
Specifcally what I want to handle is the CurrentCellChanged event so I can validate what the user typed in the text box columns in the editable datagrid. So, how can I add a handler in the form that corresponds to the CurrentCellChanged event in the custom datagrid which is inside my user control?
I guess maybe I need to bubble the event up or something but I'm not sure how to do this - any pointers would be very helpful.
TIA...
Mike
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If it was just a class that inherited the datagrid you could do it easly (the same way you normally would).
But being a usercontrol the datagrid is a part of the control and you cant access the events ferrom it directly.But you cpould do a cheesy workaround, In the user control you can define a public event and pass it trhe information that the CurrentCellChanged event gets.
At the top of the program...
Public Event CurrentCellChanged(sender as object, ........)
Then create an event sub in your usercontrol and in it put this line:
Raise Event CurrentCellChanged(sender, .........)
Now you can add this event to the main form...
Matthew Hazlett
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Thanks Matthew - I'll give that a go!
Mike
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Hello,
I have a TCP connection in which the following is sent to me:
typedef struct<br />
{<br />
int msgLength;<br />
int msgType;<br />
int seqNumber;<br />
int version;<br />
char data[1024];<br />
} XXXXXXXXXXXXXX;
The msg length: the toal msg length, i.e, sizeof (msgLength)+ sizeof(msgType)+sizeof(seqNumber)+sizeof(version)+realDataLength(276).
msgType: 1
seqNumber: squentially increased from 1.
version: 0
data: store the real content.
All the above variables except data[1024] are Big Endian. My problem is that I need to convert the big endian vars to little endian so that the windows service I have (written in VB.NET) can use them.
Here is a sample of what I thought would work:
.....
i = stream.Read(bytes, 0, bytes.Length)
Try
data = System.Text.Encoding.BigEndianUnicode.GetString(bytes, 0, 15)
........
I thought this would convert the first 16 bytes (the four integer vars from the C structure) to little endian..but nope. Then I tried the first four bytes, etc. No luck. Does anyone know how this can be accomplished in VB.NET?
Thanks.
"Half this game is ninety percent mental."
- Yogi Berra
If you can read thank a teacher, if you can read in English, thank a Marine.
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Use the IPAddress.NetworkToHostOrder method. Not the best place for it to live, IMO, it would have been better as a member of the Convert class.
Stability. What an interesting concept. -- Chris Maunder
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how can i let my program know that the PC is currently not in use by the user?
for Xample "like how Screen saver works"....
Militiaware
Faris Madi
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A screensaver would be triggered via a timer attached to a systemwide hook on the mouse and keyboard.
Christian Graus - Microsoft MVP - C++
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Hi, i made a custom control for data access, someone else is gonna use it, but i dont want them to see the code nor how its implemented, i created a new project and added a reference to that control, when i was running the program, i put a breakpoint in a call to a method of my control and it loaded the source code of the control and by pressing F8 i could see how it is implemented, i could even modify it directly from this other project.
Whats the right way to release a custom control and not letting anyone who uses see the code??
I want my control to be used just the way we use the combobox that comes with .NET
Thank you
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there's some steps you should follow to protect your control..
like Using strong name and signing assembly because a strong name prevent of name spoofing - if you have developed your own Windows control, it is easy for as outsider to create a version of your control in order to fool people into believing it was yours. in order to prevent name spoofing, the assembly must be aware of the publisher.
Militiaware
Faris Madi
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On someone elses machine, the source code will NOT be available in the debugger. They won't see your source or your implementation or anything else.
Though, you can still open up the assembly and view the code using .NET Reflector.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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