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hehe
1) Yes correct, but if it is an object that is between those forms only it isn't so bad if it is static (shared in vb.net) you just need to keep your head with in updating the object
2) yes, totally true, better is to make it a property, maybe I gave to much a quick and dirty solution
3) I didn't know the ObservableCollection and I looked it up and it is for .NET 3.0 only. I am using ArrayList a lot and it is working great for me But maybe List is better because you have the sort things etc...
Thanks for the added value, I can learn from it
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1) A lot of beginner in OO have problem with the difference between a class and an object. Hence it is a problem "mudding" the concept by using statics.
3) The main reason to use List<t> is not that it has sort etc (ArrayList has that as well). The reason is that it is strongly typed. Besides making the code a LOT easier to write (and read) it does offer some performance benefit on value type collections as well. It's not just the ArrayList that has been replaced - you have Dictionary<keytype, valuetype=""> instead of Hashtable etc.
The System.Collection.Generic still have on main problem: They do not raise events when changed... which pretty much means they are useless in a lot (if not most) cases, as you can't build a prober UI on them.
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hi guyz!!
I have a problem with datepicker, i want to know if the dropdown is currently open or not.. i need that in my condition, i really need your help, tnx in advance.
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I'm going to assume you actually mean the DateTimePicker[^] control. In order to do this, you will need to handle the DropDown[^] event, which occurs when the calendar dropdown is shown, and the CloseUp[^] event, which occurs when the calendar dropdown is dismissed.
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I've tried so hard for a whole day that I still cannot get through this tough problem, somebody please, help me!
I've got the code for Multi Column Combo in DataGridView to solve the problem of displaying multiple data, but I got stuck in displaying some values. Everything goes just fine, but when I tried to display values with the key value diplicated, it doesn't work. For example, I intended to display two rows "bmx2100 |23455 |34" and "bmx2100 |11111 |100", they have the same attribute "bmx2100", but the primary key "23455" and "11111" are different. That was what suppose to be, but now, the program displayed "bmx2100 |23455 |34" twice, and during DEBUG, I print out all the temporary variables and I found that they are all correct! So, what would be the problem!?
This is the Multi Column Combo Cell : http://www.codeproject.com/useritems/Multi_Column_Combo_Cell.asp
And this is the code snippet I modified:
protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)<br />
{<br />
Rectangle rec = new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);<br />
DataGridViewMultiColumnComboColumn column = ownerCell.OwningColumn as DataGridViewMultiColumnComboColumn;<br />
DataTable valuesTbl = column.valuesTbl;<br />
string joinByField = column.joinFieldName;<br />
SolidBrush NormalText = new SolidBrush(System.Drawing.SystemColors.ControlText);<br />
object currentItem = Items[e.Index];<br />
string currentText = GetItemText(currentItem);<br />
<br />
if (e.Index > -1)<br />
{<br />
SolidBrush normalBack = new SolidBrush(Color.White);
e.Graphics.FillRectangle(normalBack, rec);<br />
if (DroppedDown && !(Margin.Top == rec.Top))<br />
{<br />
int currentOffset = rec.Left;<br />
<br />
DataRow[] itemRows = valuesTbl.Select("[" + joinByField + "]='" + currentText + "'");<br />
<br />
SolidBrush HightlightedBack = new SolidBrush(System.Drawing.SystemColors.Highlight);<br />
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)<br />
{<br />
e.Graphics.FillRectangle(HightlightedBack, rec);<br />
}<br />
StreamWriter sw = new StreamWriter(File.OpenWrite("record"));<br />
foreach (DataRow currentRow in itemRows)<br />
{<br />
bool addBorder = false;<br />
<br />
foreach (object dataRowItem in currentRow.ItemArray)<br />
{<br />
string value = dataRowItem.ToString();
<br />
<br />
<br />
#region DrawLine<br />
if (addBorder)<br />
{<br />
SolidBrush gridBrush = new SolidBrush(Color.Gray);
long linesNum = lineWidth;<br />
while (linesNum > 0)<br />
{<br />
linesNum--;<br />
Point first = new Point(rec.Left + currentOffset, rec.Top);<br />
Point last = new Point(rec.Left + currentOffset, rec.Bottom);<br />
e.Graphics.DrawLine(new Pen(gridBrush), first, last);<br />
currentOffset++;<br />
}<br />
}<br />
else<br />
addBorder = true;<br />
#endregion<br />
<br />
SizeF extent = e.Graphics.MeasureString(value, e.Font);<br />
Rectangle textRec = new Rectangle(currentOffset, rec.Y, (int)extent.Width + 20, rec.Height);<br />
<br />
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)<br />
{<br />
SolidBrush HightlightedText = new SolidBrush(System.Drawing.SystemColors.HighlightText);<br />
e.Graphics.FillRectangle(HightlightedBack, currentOffset, rec.Y, fixedAlignColumnSize, extent.Height);<br />
e.Graphics.DrawString(value, e.Font, HightlightedText, textRec); sw.Write(value + "|");<br />
}<br />
else<br />
{<br />
e.Graphics.FillRectangle(normalBack, currentOffset, rec.Y, fixedAlignColumnSize, extent.Height);<br />
e.Graphics.DrawString(value, e.Font, NormalText, textRec); sw.Write(value + "|");<br />
}<br />
currentOffset += fixedAlignColumnSize;<br />
}<br />
sw.WriteLine();<br />
}<br />
sw.Close();<br />
}<br />
else<br />
e.Graphics.DrawString(currentText, e.Font, NormalText, rec);<br />
}<br />
}<br />
<br />
}
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You should ask this in the article's discussion forum, not here. There is a higher chance that the question will get answered by the original author that way and, since it is a question related to a specific article, other people will be able to see it along with the article.
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I'm new here so I'm appreciating your help. You mean the "Article Requests and Ideas" forum? I just post another thread in that forum. Thank you for your help.
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No, that forum is for people to submit ideas for articles. Each article has a discussion forum associated with it, that you can see at the bottom of the article. You get to the discussion forum for the article by going to that articles web page.
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How to make a label (label1 ) move with the arrow keys, with up making it move up, down, down, right,... Thanks in advance -M.S.
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Hi,
expanding on number 4 of my earlier reply to you[^], give the Control you draw on a KeyDown handler, and compare
KeyEventArgs.KeyCode with Keys.Up/Down/Left/Right; on a match, change your drawing parameters
and Invalidate the Panel.
If you insist on "drawing" with a label, change the Location of your label (no need to
invalidate then).
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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I see what you're getting at, but do you have any specific code, I'm still pretty new to C#, but going along... Thanks, though.
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Hi,
what you could do is read my Sokoban article and code, it is a puzzle tool with simple
graphics.
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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On CodeProject.
you can find it using the CP Search engine, using Google, or by clicking "My Articles" below.
Do you really want to become a programmer, then learn to look around and search a little...
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Hey im having a problem with threads and Connections.
When the user loging to my program im trying to update the status bar.
just a small loop that will run for 7 sec (avg),
but when im sending the loging info to the database with a thread, the thread is closing my connection and fail.
*.when im not using threads all working good.
*.im using oracle 8 database.
*.is there someting i need to do with the connection string ?
btw i know how to work with threads it's just dont working with a connections
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michael@cohen wrote: i know how to work with threads
Are you sure?
Try it without the status bar update, and if that runs fine, start using Control.InvokeRequired
and Control.Invoke (plenty of examples around).
Luc Pattyn [Forum Guidelines] [My Articles]
this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google
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Dear All,
I need to develop a Image Processing Application which can do OCR- recognition of typewritten text and ICR – recognition of handwritten text. It has to be done using C# in Visual studio 2005 environment. Although I am into .Net for sometime I am a newbie as far as Image Processing is concerned.
Specifically, I require help in the following areas:
1. Pre Processing of Images in order to improve Recognition accuracy. There are many processes like deskew, despeckle ,flipping etc. But which are the processes that need to be applied. Does it depend on the quality of the image. Is it required to apply graphics Filters, if so which are those.
2. Dividing the Image into Zones i.e OCR and ICR.
3. Retrieving the pixels from each element and feeding it into a neural network Library for accurate Recognition.
4. Displaying the Recognised text in another Window for Spell checking and correction.
There are a lot of good articles in this forum but they give information in bits and pieces and it is very difficult(if not impossible) to put it all together for developing this application.
Can someone give me a total picture step wise as mentioned above. If someone,who has developed a similar Application and who has a good knowledge of C# comes forward to help me in developing this Application I shall be ever grateful to the person. In addition I am willing to pay Consultation charges.You may refer me some good books which covers this subject in detail and which provides code.
Sunny74.
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Your post is a pretty tall order. Consider breaking it down into smaller, more manageable bits.
"Find it your bloody self - immediately!" - Dave Kreskowiak
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OK, lets start with the first one.
Tell me the following:
1.What are the processes involved in the pre processing of an Image?
2.Does it depend on the quality of an Image.If so how to determine that?
Thanks in advance,
sunny74
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Hi,
How I can put the Flash Animations on the Visual Studio C# .Net form?
Can I put the animated gif image?
Can I use the Flash Buttons?
If answer is YES………then how can I do?
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You can use the windows media player control to play movie files. You can use code that's in an article on this site to play animated gifs. You need to visit the flash site to find a control to play flash, assuming that one exists.
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 )
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Hello,
I am working on a small application coded in C# with multiple forms. This application needs to bring in data from my Access Database. I was hoping someone could point me to a good tutorial or any information that could help me. Thanks!
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<br />
sConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\DB.mdb;";<br />
INSERT, UPDATE, DELETE DATA
sQuery is the SQL string
<br />
OleDbConnection oleDbConn = new OleDbConnection(sConnString);<br />
<br />
OleDbCommand oleDbCmd = new OleDbCommand(sQuery, oleDbConn);<br />
<br />
oleDbConn.Open();<br />
<br />
oleDbCmd.ExecuteNonQuery();<br />
<br />
oleDbConn.Close();<br />
SELECT DATA
<br />
OleDbConnection oleDbConn = new OleDbConnection(sConnString);<br />
<br />
OleDbCommand oleDbCmd = new OleDbCommand(sQuery, oleDbConn);<br />
<br />
oleDbConn.Open();<br />
<br />
OleDbDataReader oleDbRd = oleDbCmd.ExecuteReader();<br />
<br />
while (oleDbRd.Read())<br />
{<br />
textbox1.Text = oleDbRd.GetValue(0);<br />
}<br />
<br />
oleDbConn.Close();<br />
<br />
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How can I have XmlSerializer.Deserializer deserialize an array of Category objects? Right now it'll only work on a single Category object.
<categories>
−
<category>
<content-provider-id type="integer">1</content-provider-id>
<id type="integer">2</id>
<name>Traffic Alerts</name>
</category>
−
<category>
<content-provider-id type="integer">1</content-provider-id>
<id type="integer">1</id>
<name>News Alerts</name>
</category>
−
<category>
<content-provider-id type="integer">1</content-provider-id>
<id type="integer">3</id>
<name>testing category</name>
</category>
−
<category>
<content-provider-id type="integer">1</content-provider-id>
<id type="integer">7</id>
<name>curl test</name>
</category>
−
<category>
<content-provider-id type="integer">1</content-provider-id>
<id type="integer">8</id>
<name>sapce test</name>
</category>
</categories>
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Assuming that "categories" is your root XML element, then you can do the following:
using System;
using System.Collections.Generic;
using System.Xml.Serialization;
namespace WindowsApplication1 {
[XmlRoot("categories")]
public class categories : List<category> {
}
}
When building your XmlSerializer, you need to specify "categories" as the type like so:
XmlSerializer xs = new XmlSerializer(typeof(categories));
-- modified at 11:59 Monday 1st October, 2007 -- Had to escape out <
Take care,
Tom
-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com
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