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In my current project I need to customize ListView control's appearance. I need to change the groups heading style. Is there any way to do this ? I have inherited a new control from ListView class. But I couldn't find any helping methods to override. Anyone having any idea on doing this ?
Thanks
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Thanks, I will check that
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N a v a n e e t h wrote: I need to change the groups heading style.
First there is no single ListView Control, there are different versions of it. Some messages for the control like LVM_MOVEITEMTOGROUP are still documented as "not implemented". My interpretation of the Vista ListView documentation is that you can now assign an image from the controls image list to a Group. This might mean that you could use images to control the Group Header. I did not research the 3.0 BCL ListView to see if those messages have been included in the ListView class. However you could always do it yourself with C++/CLI or even *gulp* PInvoke.
led mike
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led mike wrote: PInvoke.
Thanks. I was also thinking same. But problem is, my application is supposed to work under MAC too. So I am doing a MONO compilation for this. Pinvokes are not fully supported with MONO.
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N a v a n e e t h wrote: my application is supposed to work under MAC too. So I am doing a MONO compilation for this.
That's probably something you want to say up front in all your future posts for that project.
led mike
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Hi all,
So you have a table "Items" with 2 fields (SQL Server 2000):
Column Datatype Length Allow Nulls
-------------------------------------------
ItemID int 4 0
ItemPicture image 16 1
Now you want to insert a record with the ItemID=1 and with no picture (i.e. null).
So you do this (.NET 2.0):
string strSQL =
"insert into items (ItemID, ItemPicture) values(@ItemID, @ItemPicture)";
SqlCommand cmd = new SqlCommand(strSQL, GetDBConnection());
cmd.Parameters.AddWithValue("@ItemID", "1");
cmd.Parameters.AddWithValue("@ItemPicture", System.DBNull.Value);
if (cmd.Connection.State != ConnectionState.Open)
cmd.Connection.Open();
cmd.ExecuteNonQuery();
if (cmd.Connection.State != ConnectionState.Closed)
cmd.Connection.Close();
And you get an exception: "Operand type clash: nvarchar is incompatible with image".
Question:
So how can you insert a null value to an image field?
Thanks in advance,
Danny
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DannyAdler wrote: So how can you insert a null value to an image field?
I have no idea. Can you not just insert a picture of size 1*1, or 0*0? Infact, does it even let you make a picture of 0*0?
My current favourite word is: Nipple!
-SK Genius
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The DBNull value is converted to a string, so you are actually trying to put the string returned by DBNull.ToString() (which is an empty string) into the field.
Specify the data type for the parameter:
cmd.Parameters.Add("@ItemPicture", SqlDbType.Image).Value = System.DBNull.Value;
Experience is the sum of all the mistakes you have done.
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When I first run my app and mini it to that system tray I can hover the mouse over it and it will show the correct text. If I show the form back to the screen and then hover the mouse over it says (1 runs). Now if I continue to mini and show this form the number increases (2 runs)... What is this?
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Something in your code is updating the Text property of the NotifyIcon when restored from and minimized to tray.
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Yep you are correct. I'm using some pretty cool code to clear out phantom icons from the system tray that changed my text. I have it all working now, thank you 
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Gene Arnold wrote: some pretty cool code
Well thank you sir.
TrayIconBuster checks all NotifyIcons once every 5 seconds by default, and shows how often
it did so far; this is unrelated to minimizing your app tho.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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Hi All,
Is there a way to automatically refresh a control on the page without the user generating an event? For example, can I refresh a datagrid on a page every 5 seconds?
Thanks
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Yup, set up a Windows.Forms.Timer (there's lots of different timers) set the interval to 5000.
And then inside you can call myControl.Update(); or myControl.Refresh(); or myControl.Invalidate();.
One of those should probably do it. 
My current favourite word is: Nipple!
-SK Genius
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Thank you very much.Can i do that on asp.net page???
I would really appreciate if you can give me more tips on how to do it on a web page?
Thank you!!!
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Well, i assume you wont be using the Windows.Forms.Timer on a webpage, but there are other timers, like, System.Timers.Timer
Apart from that, i don't know.
My current favourite word is: Nipple!
-SK Genius
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You should look at the AJAX framework and the update panel.
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I have an application that takes images and stores them automatically in a folder on my local drive. The application auto increments the file name by adding 1 to the last one taken. I name the images as photo_00001 and the next taken photo names as photo_00002. Now I want to look through the folder and select the last image taken that is the one with the highes name. Any ideas how I can achieve that?
a novice
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Hi, there are a couple of solutions:
- use Directory.GetFiles() to get all the file names, then find the "highest" file name in those.
- use Directory.GetFiles() to get all the file names, then find the latest file by comparing
creation times using File.GetCreationTime()
- do a binary search for filenames that match your syntax, checking existence with File.Exists()
- teach your app to save the latest file name (a single string) in a fixed location, probably
a file in the same folder ("latestFile.txt").
- teach your app to save the latest file name (a single string) in the registry somewhere.
Probably not good:
- do a linear search for filenames that match your syntax, checking existence with File.Exists();
is slow and might return a hole in the sequence if you somehow deleted an older file.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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How to get current date from MonthCalander control???
Thank You!!
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In the month calendar you can select a range of dates accessible by SelectionStart, SelectionEnd and SelectionRange properties.
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Hi to all !
i wants to block an Ip address to not send or recieve data from that ip. can anyone help me that how i can block urls.
thanks to all
Tahir
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You'd have to intercept the packets i guess. Then read them to see the destination / source and block them accordingly.
It seems more like a C++ Jobby to me, but i've never really looked in to networks with C#.
My current favourite word is: Nipple!
-SK Genius
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I am using a contextmenuStrip in Treeview . The problem is When
1. Open Context menu strip by right clicking TreeNode.
2. Do not select any item in Context Menu Strip .
3. Select any TreeNode in Treeview . Now Context Menu Disappears. (This is fine)
4. Now press any keyboard Key . Nothing is working . The control is still
with ContextMenuStrip popup menu even though it is has disappeared.
How to solve this problem ?. How to disable the Key down event in ContextMemuStrip ?
I am able to trap PreviewKeyDown event for ContextMenu but not able to diable Key Down event in Context Menu.
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