C# Discussion Boards - CodeProject

Re: Can i add a background image to the Windows datagrid?

RajeshGuptha19-Apr-05 19:14

19-Apr-05 19:14

But in that case will i be able to disable to display the extra column shown at the beginning(the one with arrow and a star)? in my design i dont want that.

Re: Can i add a background image to the Windows datagrid?

Jim Matthews20-Apr-05 3:14

Jim Matthews

20-Apr-05 3:14

in that case i would recommend looking at one of the many freely available open source datagrid controls that are out there such as SourceGrid by Davide Icardi. Not sure if this is going to have all of the functionality you need, but at least it will be a starting point. You can then use the source code to help start designing a custom grid of your own, or extend it to do exactly what you need. Be sure to check the license agreement for usage restrictions.

hope this helps.

-jim

Re: Can i add a background image to the Windows datagrid?

RajeshGuptha20-Apr-05 7:20

RajeshGuptha

20-Apr-05 7:20

thanks a lot Jim. Im sure that i can proceed on with this.

Tray Icons

CStiefeling19-Apr-05 8:09

CStiefeling

19-Apr-05 8:09

Hi,

Sorry for the off-topic post. I'm looking for some advice about how to make tray icons look nice. WinXP seems to want to take my 32x32 by 256 color icons and compress them down into something that doesn't look very good - it seems to ignore the 16x16 plane. I've noticed that other tray icons look very nice so I assume that there is a better format to use for tray icons -- any tips?

Thanks,
Chris

Re: Tray Icons

leppie19-Apr-05 19:11

leppie

19-Apr-05 19:11

16x16 32-bit color has allways worked well for me.

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Db2 connection??

trk_wakil19-Apr-05 7:38

trk_wakil

19-Apr-05 7:38

Hi everyone..

I am still stuck at the problem and any help would be appreciated..

How do I open a connection to a database stored on the IBM server?? I know how to open it with a database stored on my machine with OleDb, but can't find the way to do it for a Db2 database.
If anyone has a sample code they know it works, please help!!!

Thanks
E.T.

DragOver assistance needed...

new_phoenix19-Apr-05 7:27

new_phoenix

19-Apr-05 7:27

Hi, everybody!!!

I have a control that I would like to drag on a form, but I would not like to drag the control with the top left hand corner showing the dragging rectangle at System.Drawing.Location(0, 0). Instead, I would like to drag the control by dragging at the point where the mouse is clicked on the control in the control's MouseDown event.

To accomplish this, I have declared a variable dragPoint at the form level, and then in the MouseDown event, I make the assignment to the position on the control where the mouse was clicked.

In the DragOver event, the control is simply repositioned based upon either a PointToClient or a RectangleToClient location assignment and then the control.Top and control.Left assignments are made for the new control's location. I would prefer to use the RectangleToClient approach because I need to be able to click on the control at any location of the control's bounds.

When using the RectangleToClient approach, I would like to assign the control.bounds to a rectangle object, because the RectangleToClient returns a rectangle. Then, assign the width and height of the boundingRect rectangle object so that the entire control is now able to be selected. Now, I need to be able to subtract the dragPoint.X from the boundingRect.X and then assign the result to the control.Left and the control.Top OR perhaps to the e.X and e.Y.

Here is the problem: I know that there should be a place where the dragPoint is subtracted from the boundingRect rectangle and then assigned to the control.Left and the control.Top properties, but when I try to do that using just integer numbers, the result no longer shows the dragging rectangle at the top left of the control while the control is being dragged. Instead, it shows a circle with a slash through it, thereby indicating that something is not mathematically correct. How would I set the control to drag from the dragPoint set in the MouseDown event, and then reposition itself in accordance with that dragPoint when the control is moved in the DragOver event.

The code is as follows:

<br />
// create the dragPoint variable<br />
private static System.Drawing.Point dragPoint;<br />
<br />
<br />
private void MouseDown(object sender, MouseDownEventArgs e)<br />
{<br />
  // assign the dragPoint in MouseDown<br />
  dragPoint.X = e.X;<br />
  dragPoint.Y = e.Y;<br />
}<br />
<br />
// approach using PointToClient but it only drags from the top left hand corner at System.Drawing.Point(0, 0)<br />
private void DragOver(object sender, DragEventArgs e)<br />
{ <br />
   // cthis is the form that the control is dragged over and ctrl is the control dragged<br />
   System.Drawing.Point NewLocation = cthis.PointToClient(new System.Drawing.Point(e.X, e.Y));<br />
   ctrl.Left = NewLocation.X + 2;<br />
   ctrl.Top = NewLocation.Y + 2;<br />
}<br />
<br />
// approach using RectangleToClient but it only drags from the top left hand corner at System.Drawing.Point(0, 0). Would like to use the control.bounds as a rectangle to compare the dragPoint before the new control location is made.<br />
<br />
private void DragOver(object sender, DragEventArgs e)<br />
{ <br />
   // cthis is the form that the control is dragged over and ctrl is the control dragged<br />
  Rectangle boundingRect = ctrl.Bounds;<br />
  boundingRect.X = e.X;   // boundingRect.X = e.X - dragPoint.X ???<br />
  boundingRect.Y = e.Y;   // boundingRect.Y = e.Y - dragPoint.Y ???<br />
  boundingRect.Width = ctrl.Width;<br />
  boundingRect.Height = ctrl.Height;<br />
  Rectangle NewLocation = cthis.RectangleToClient(new   Rectangle(boundingRect.X, boundingRect.Y, boundingRect.Width, boundingRect.Height));<br />
  ctrl.Left = NewLocation.X + 2;<br />
  ctrl.Top = NewLocation.Y + 2;<br />
}<br />
<br />
<br />
Would really appreciate some insight as to how to drag a control in the DragOver event where the control is dragged from the dragPoint that is set in the MouseDown event and the dragPoint variable is set at the form level.

Re: DragOver assistance needed...

John Fisher19-Apr-05 8:27

John Fisher

19-Apr-05 8:27

If all you want is to drag from the spot you "grabbed", then you don't need to use the Rectangles. You can to do that with something like the following. (Note that I didn't actually test this code...)

It works by turning your "dragPoint" variable into an offset from the top-left corner of the control being dragged. Then, every mouse move can subtract that offset from the current mouse position to get the control's desired position.

<br />
private void MouseDown(object sender, MouseDownEventArgs e)<br />
{<br />
// assign the dragPoint in MouseDown<br />
dragPoint.X = e.X;<br />
dragPoint.Y = e.Y;<br />
dragPoint = PointToClient(dragPoint);<br />
dragPoint.X -= ctrl.X;<br />
dragPoint.Y -= ctrl.Y;<br />
}<br />
<br />
private void DragOver(object sender, DragEventArgs e)<br />
{ <br />
// cthis is the form that the control is dragged over and ctrl is the control dragged<br />
System.Drawing.Point NewLocation = cthis.PointToClient(new System.Drawing.Point(e.X, e.Y));<br />
ctrl.Left = NewLocation.X - dragPoint.X;<br />
ctrl.Top = NewLocation.Y - dragPoint.Y;<br />
}<br />

John

"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.

Re: DragOver assistance needed...

new_phoenix19-Apr-05 8:38

new_phoenix

19-Apr-05 8:38

John Fisher:

Thanks!!! I will try your code and will
let you know whether it worked.

Much appreciated!!!

New_Phoenix

Regex: Very basic question

matthias s.19-Apr-05 5:42

matthias s.

19-Apr-05 5:42

Why does this match?

string sSearch = "-- --";
const string sRegEx = "[a-z]*[A-Z]*[0-9]*";
if (Regex.IsMatch(sSearch, sRegEx)) {
  // do something funny
}

My understanding is, it should allow any number of characters in the range of a-z, A-Z or any number between 0-9. I guess there is something basic I'm missing out here Unsure | :~

/matthias

I love deadlines. I like the whooshing sound they make as they fly by.
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Re: Regex: Very basic question

dratcha19-Apr-05 6:52

dratcha

19-Apr-05 6:52

* matches 0 or more occurences of the previous character or subexpression, while + matches 1 or more.

Try this instead:
const string sRegEx = "[a-z]+[A-Z]+[0-9]+";

Re: Regex: Very basic question

matthias s.19-Apr-05 12:23

matthias s.

19-Apr-05 12:23

Thanks for your reply!

dratcha wrote:
<* matches 0 or more occurences of the previous character or subexpression, while + matches 1 or more.

Yes, but if I use a + instead of a * doesn't that mean i will definetely need 1 char in the range [a-z], plus one in the range [A-Z] and so forth?

With the expression I've build in my previous post (using *), I thought to provide a subset of characters which should be allowed as input. But the string '-- --' marched right through claiming it was valid. How come? It wasn't listed in any of the subsets!

I just want to understand... Sniff | :^)

/matthias

I love deadlines. I like the whooshing sound they make as they fly by.
[Douglas Adams]

Re: Regex: Very basic question

leppie19-Apr-05 19:18

leppie

19-Apr-05 19:18

matthias s. wrote:
But the string '-- --' marched right through claiming it was valid. How come?

DId you look at the actual text that was matched? No. Else you would see the match length wasnt 0, in your case it will be.

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Re: Regex: Very basic question

matthias s.20-Apr-05 0:16

matthias s.

20-Apr-05 0:16

Hi leppie,

thanks for your reply. I still don't understand why IsMatch is returning true. For my understanding it should return true if a match has been found. My regular Expression states, that allowed characters are a-z, A-Z, 0-9 in any quantity. It doesn't say that '--' is a valid character. D'Oh! | :doh:

Could you please provide a short snippet that does the following: Check a given string (say, the SearchString) whether all input characters are falling into these categories a-z, A-Z, 0-9. If the SearchString contains one or more invalid characters, such as : or ; or -, the check should fail and an empty string should be returned. If all characters are valid, the snippet should return the complete SearchString as it was originally passed to the method.

I usually don't ask people writing code for me, but I really would like to understand the workings here. Drives me nuts to walk around and make a stupid face... Dead | X|

Thanks in advance!

/matthias

I love deadlines. I like the whooshing sound they make as they fly by.
[Douglas Adams]

Re: Regex: Very basic question

leppie20-Apr-05 3:58

leppie

20-Apr-05 3:58

matthias s. wrote:
allowed characters are a-z, A-Z, 0-9 in any quantity

In Regex terms thats is an ambigious description.

Do you mean?
a. any number of a-z followed by, any number of A-Z followed by, any number of 0-9 ([a-z]*[A-Z]*[0-9]*). This is also note really correct (it can be, but the Regex wil be complex), but you can check the Length property of the returned Match object if its larger than 0.
b. one of more of a-z OR A-Z OR 0-9 ([a-zA-Z0-9]+ or using a character class \w+ that matches any alphabet char or number).

Also you want to check the whole input string, so u will need to add SOL/EOL markers. Eg.

^\w+$

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Re: Regex: Very basic question

Member 163675520-Apr-05 23:39

Member 1636755

20-Apr-05 23:39

if u want enter string not contains any special chars.
It should contain only alpha numeric then use this code

string sSearch = "-- --";const string sRegEx = "[a-zA-Z0-9]";
if (Regex.IsMatch(sSearch, sRegEx)) //if return true
{
// do something funny
}

Naveen Sagar

Re: Regex: Very basic question

leppie19-Apr-05 19:21

leppie

19-Apr-05 19:21

[a-z]*[A-Z]*[0-9]* will match:
aA0
aA
a
A0
a0
aaaaaAAAA0000, etc.

I think you are looking for:
[a-zA-Z0-9]+

Note the 'match one or more'.

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Datagrid formatting

esjq19-Apr-05 4:55

esjq

19-Apr-05 4:55

Hi!

Is it possible to hide columns in the datagrid?

When using the original setup of the datagrid every column is displayed. And if you would like to populate the datagrid with information from a database, it displays the primary key and foreign key columns as well.

Is there a way to hide an arbitrary column in the datagrid, but still being able to reach the value of the it behind the scenes?

Thank you! Smile | :)

Re: Datagrid formatting

John Fisher19-Apr-05 8:14

John Fisher

19-Apr-05 8:14

Sounds like you need to look into using the DataView. Research to see if it fits your needs, then ask again if you need more info.

John

"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.

Re: Datagrid formatting

Luis Alonso Ramos19-Apr-05 9:17

Luis Alonso Ramos

19-Apr-05 9:17

Yes, check the DataGridTableStyle class. The basic idea is that you create one DataGridTableStyle object, and then add DataGridTextBoxColumn or other column types (check boxes por example) to the table style, only for the columns you want to display (use the MappingName property).

Here's an example, from some code I'm working on right now:

DataGridTableStyle style = new DataGridTableStyle();
style.MappingName        = dtZoneCollectors.TableName;

DataGridTextBoxColumn textCol = new DataGridTextBoxColumn();
textCol.MappingName           = "column_name";
textCol.HeaderText            = "Name as it will appear to the user";
textCol.Width                 = 200;
textCol.ReadOnly              = true;
style.GridColumnStyles.Add(textCol);

gridCollectors.TableStyles.Add(style);

It only adds one column, but hopefully you'll get the idea.

Good luck!

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

Re: Datagrid formatting

esjq19-Apr-05 19:58

esjq

19-Apr-05 19:58

Thank you! Smile | :)

How to select a check box and add to cart in C#

userid_userid19-Apr-05 3:43

userid_userid

19-Apr-05 3:43

I am very new to C# (using C# express beta 2.0) and need some help.
I started a windows form, added a web browser and specified the URL location.
On that page, I want to select (check box) items that match my list and add to cart. I searched a lot but was not able to find how to do this. Any help is appreciated.

"Secure Electronic Transaction" in C#?

msdawy19-Apr-05 3:30

msdawy

19-Apr-05 3:30

Hello,
I am new to the field of security. I am looking for a program that implements the "Secure Electronic Transaction" (SET) protocol. Is such a program available?

Thank you very much in advance.

I am also looking for help on Microsoft Security Toolkit. Is it already installed with VS .NET? or must it be separately installed? Any tutors on using it?

Thank you very much for all the help.

ComboBox problem

vuthaianh19-Apr-05 2:44

vuthaianh

19-Apr-05 2:44

It seems that the ValueMember property of Combobox doesn't accept the data of INT type
I've got a table including two fields(subID: int and subName: nvarchar)

combobox.DisplayMember = "subName"
combobxo.ValueMember = "subID"

when i bind my table to combobox
it always report error message: "Incorrect input string format"

Thanks

Re: ComboBox problem

MoustafaS19-Apr-05 4:25

MoustafaS

19-Apr-05 4:25

Try this:
YouTable[SubID].ToString().

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.