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I keep getting the following error when trying to delete a row from a dataset using a datagrid (specifically the last row in the datagrid) :
An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll
Additional information: Object reference not set to an instance of an object.
Does anyone have a tried and tested method for adding,updating,and deleting rows from a dataset using a datagrid? I have found alot of information, and people seem to have had the same problem, but have not found a solution.
using visual basic .net 2003
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Dim row As Integer
Dim str As String
row = DataGrid1.CurrentRowIndex
DataGrid1.Select(row)
Dim myTable As DataTable
myTable = DataGrid1.DataSource
myTable.Rows.RemoveAt(row)
u count how many rows are presented
the rows less than 0 exit the fucntion or exit sub
Continue...
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Does anyone know of a full tutorial on the the datagrid and databinding?
My datagrid still will not delete the last record without crashing.
I think it has to do with the primary key of the database now though...
OleDbDataAdapter1.FillSchema(ds, SchemaType.Source, "spray_log")
OleDbDataAdapter1.ContinueUpdateOnError = True
OleDbDataAdapter1.Fill(ds)
ds.AcceptChanges()
The first line is supposed to keep my autoincrement of the IDNUM working, but when I look at it (IDNUM) in my datagrid, it will sometimes go from 2348 to 2350 instead of 2349. I can see why the command builder would have a hard time.
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Could someone point me towards a good tutorial on troubleshooting/debugging?
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hi guys,
I have a question, how to make a chat messenger like yahoo messenger or msn messenger and connected it with the server that use sql server ?
How to make the connection between the client that use the application program (messenger) and the server that contains the sql server ?
How to make this by using VB.Net ?
what is the starting point (what the things that i must know to perform this)?
thanks for all
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Well, knowledge of TCP/IP would help alot. How to write clients that communicate using sockets, and most of all how to write a multi-threaded socket server. Just search the articles for "CHAT" and you'll come up with a bunch of examples.
I fail to see how an SQL Server figures into this, unless you're going to be logging everything everyone says.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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it is the problem with your operating system not the application
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First of all, WHY ARE YOU YELLING??
If you're getting a message that says "This application in not a valid Win32 Application," it usually means that the .EXE file you launched is corrupted. You'll have to replace it with a new copy from a known good source.
What you're saying about the problem doesn't make much sense though. Are you saying that if you replace the .EXE, then run it, it works the first time, but every time after that this message comes up? Is it possible you have a bad, or dying, hard drive?
BTW: What does this have to do with VB.NET?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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i,m a vb.net programmer
& yes when i replace the exe it works & then it gives the same message
it's working v.good on any pc with fat32
but not on ntfs
and it's not te os or the hardisk
so can u help me plz
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I have no idea what's wrong. In 20+ years of doing this, I've never seen the problem before.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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What is your .EXE doing?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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win app connected to sql db
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Still have no idea what's wrong. Is there only one machine this happens on or all of your client machines?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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it works with fat32 pc's but not with ntfs ones
thx
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Hello.
I have to develop a ppc application who can handle ftp communication.
I tried some ways to do it, but they all failed (with wininet and webrequest). I m using VB.net Compact framework.
Does someone have some sources, advices or documentations to provide?
Regards,
Rome
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It s working ^^.
I was on this problem since the beginning of the week.
You were very helpful.
Thank you very much.
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Hi,
Can anyone tell me how to increase the icon size of a listview without increasing the font size is there any way if yes please tell me
thanks in advance
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In the Properties of the ListView control, you must specify a "LargeImageList" and then near the bottom, under the "View" property, set it to "LargeIcon"
All this can also be done in code:
If you specify a SmallImageList as well, you may allow the user to switch between views via a ContextMenu (for Example).
ListView1.LargeImageList = ImageList1<br />
ListView1.SmallImageList = ImageList2<br />
<br />
'Change to Large icons <br />
ListView1.View = View.LargeIcon<br />
<br />
'or Small icons<br />
ListView1.View = View.SmallIcon
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no man i want to increase the size of icons that are associated with largeicon view
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Just change the size of the icons in the ImageList then. There's an ImageSize property...just change the width and height to 48x48 or to your liking. FYI: if your icon's original size is not that big, it may show up blurred.
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thanks man it worked
thanks alot
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