Programming processes in C# - concurrency [modified] - C# Discussion Boards

Stu Richardson20-Jun-07 3:40

20-Jun-07 3:40

Id agree with Chintan however if it is definately an array you want to use then utilise the list boxes CopyTo property:

listBox1.Items.CopyTo(yourArray, index);

Re: change de currentrow of datagridview

Chintan.Desai20-Jun-07 3:45

Chintan.Desai

20-Jun-07 3:45

//Here, select any rows in your Datagrid view by mouse or tab key.
//just replace 'objView' with your data grid view name.

DataGridView objView = new DataGridView();
//This will return currently selected row.

DataGridViewRow row= objView.CurrentRow;
//Now here just specify the ColumnName and assign the updated value.In this case i have updated the column with string "Bill Gates".

row.Cells["ColumnName"].Value = "Bill Gates";
//Hop you understood.
//nJoy

Regards
Chintan
www.visharadsoft.com
(Nothing is so purify as KNOWLEDGE)

Exporting Data to Multiple Excel Sheets in C# Windows Application

meeram39520-Jun-07 2:10

meeram395

20-Jun-07 2:10

Hi,

I'm using RKLib Component for exporting data to Excel and it is working perfectly for me. But the drawback of this component is we can export data only to one excel sheet. Anybody have any idea of any component that will export data to excel to multiple worksheets? Any help in this regard would be great. Currently this application is windows. I would like to use the component, if available, in web also.

Thanks in advance
Blush | :O

Meeram395

Re: Exporting Data to Multiple Excel Sheets in C# Windows Application

Sandeep Akhare20-Jun-07 3:09

Sandeep Akhare

20-Jun-07 3:09

raja_raman wrote:
'm using RKLib Component

I don't know about that component as i never worked on that

One way is to use COM Objects that will loads the number of Excel sheets you want to load and transfer the data But the drawback of COM objects are bulky and you will have to take care of heap Memory as they will not definetly Garbage Collected .

Antoher way is using Micro of Excel Sheet that is faster and consume low memory

So choose your best option

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

how can i make a full row select in a datagrid

-spy-20-Jun-07 1:52

-spy-

20-Jun-07 1:52

how can i make a full row select in a datagrid, without using the row headers? im using visual studio.net 2003

Re: how can i make a full row select in a datagrid

Not Active20-Jun-07 2:24

Not Active

20-Jun-07 2:24

Handle a mouse event and use HitTestInfo

private void DataGrid1MouseDown(object sender, MouseEventArgs e)<br />
{<br />
   HitTestInfo hit = DataGrid1.HitTest(e.X, e.Y);<br />
<br />
   if( hit.Type == HitTestType.Cell )<br />
      DataGrid1.Select(hit.Row);<br />
}

only two letters away from being an asset

Re: how can i make a full row select in a datagrid

Stu Richardson20-Jun-07 3:35

Stu Richardson

20-Jun-07 3:35

If you want this to be a permanent feature then I would do it by setting the grids SelectionMode property to be FullRowSelect.

This can be done through code:

dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

Or on the properties window.

Programming processes in C# - concurrency [modified]

Theghost20-Jun-07 1:22

Theghost

20-Jun-07 1:22

Hi all,

I would like to know if C# enables this type of programming:
consider this example: an undetermined number of Cars coming from two sources to a car Park. The car park has to decide which car to let in the car park.
(1) How can I program such specification in C#? Do I need to use threading?? what type of programming capture this sort of requirement? functional doesn't seem to be a way.

road1 cars1[1,2,3,...n] --->
--> road3, waits for cars coming from road 1 or road 2
--> ..cars2[2], cars1[3], cars1[2],cars2[1],cars1[1]

road2 cars2[1,...m] ----->

(a) How does C# deals with two cars arriving in the same time?
(b) Does it handle deadlock
(c) Can this be exposed as a Web Service?

The reason why I want to know this is because I program Web Services a lot. Most Web services I programmed in C# are functions preceeded with the command "WebMethod" command so they can be exposed as Web services. In a recent conference I was asked if i can expose a process or a protocol as a web servce and couldn't answer it. The challenge with this type is they require many inputs coming at different times not like in functional style where all paramters are know and must have values when invoking the method.

Many thanks in advance Wink | ;)

-- modified at 7:39 Wednesday 20th June, 2007

-- modified at 7:41 Wednesday 20th June, 2007

-- modified at 7:41 Wednesday 20th June, 2007

bye

Re: Programming processes in C# - concurrency

J4amieC20-Jun-07 3:01

J4amieC

20-Jun-07 3:01

This is not a language question, this is an architecture and design question.

C# can handle threading, concurrency and critial sections of code just fine. It can also be used to write methods that can be exposed as web methods (as you know).

Your question should be how do you go about setting up such as system as you describe above. Is will invariably require something to "maintain state" of the car park (such as a database, or a central server).

---

How to get answers to your questions[^]

Key Press event of textbox

Sapan Roy20-Jun-07 1:10

Sapan Roy

20-Jun-07 1:10

Hi, all

Is there any way to handle keypress event of textbox in C#. Actually I am working in asp.net I create a dyanmic table which contain some textbox. But after clicking Update button I am not able to access modified data inside the textbox.

Please help me...If u have any idea...
Thanks
Sapan

Life is full of happy Moments but If u are not stucking....

Re: Key Press event of textbox

Martin#20-Jun-07 1:16

Martin#

20-Jun-07 1:16

Hello,

this.textBox1.KeyPress+=new KeyPressEventHandler(textBox5_KeyPress);<br />
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)<br />
{<br />
   //Do what you want here<br />
}

All the best,

Martin

String Concatenation Issue

Brendan Vogt20-Jun-07 0:44

Brendan Vogt

20-Jun-07 0:44

Hi,

I have an xml file that was exported by my function. There is 36 fields in the products table. Now a user can select which fields he/she wants to export to the xml file, below is an example of what the xml file looks like:

<Products>
<Product>
<ID>5555</ID>
<ProductName>Yellow Marker</ProductName>
<Price>4</Price>
<Status>1</Status>
<ShortDescription>Short Description</ShortDescription>
<LongDescription>Long Description</LongDescription>
</Product>
</Products>

The tag name, for example <ProductName /> is the name of the field, with the value of the field between the tags.

Now my Product class has properties for each field. I normally set my fields like this:

Product p = new Product();
p.ID = "5555";
p.ProductName = "Yellow Marker";
p.Price = 4;
p.Status = 1;
p.ShortDescription = "Short Description";
p.LongDescription = "Long Description";
etc., etc., etc...

Now I only want to populate the properties that occurs as a tag. I need to do this dynamically. How do I do this? I can do Product p = new Product(); by hard code, but how do I do p. and the name of the field together so that it is recognised as, for example p.Price?

I hope I am making sense.

Regards
ma se

Re: String Concatenation Issue

Martin#20-Jun-07 0:51

Martin#

20-Jun-07 0:51

Hello,

Looks like you are rebuilding "System.Xml.Serialization" methods. (search it here on the articles)

But to answer your question:
Reflection is what you are looking for.

All the best,

Martin

Re: String Concatenation Issue

Sandeep Akhare20-Jun-07 0:59

Sandeep Akhare

20-Jun-07 0:59

ma se wrote:
Now a user can select which fields he/she wants to export to the xml file

How are you providing this ?

ma se wrote:
Now I only want to populate the properties that occurs as a tag.

First initialze your varaibles with 0 or null or something like that check for null /0 before populating if it is null/0 means that user has not given the values of that field exclude that field.

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

file server

sureshprabhu20-Jun-07 0:33

sureshprabhu

20-Jun-07 0:33

hi!

i have one folder in my domain server, in that folder there are five folders in them there are thousands of files in each of them. With these, I want to create one file server. The five folders had individual users. And also I want to create user interface which will appear in client systems in a web browser. In the very first page the five folders will appear, but the particular user only can open that folder and he can download the files in that folder and also he can upload files to that folder. one user can open only his folder he cant open other folders. this user authentication will be helded on file server which is in my domain server. How can I do this? Please give me any idea to do this!

thanks in advance!

Serializing the same object instance twice...

Shy Agam20-Jun-07 0:10

Shy Agam

20-Jun-07 0:10

Hello,

I have a collection of ITask (an interface I've created) objects.
References to these objets are duplicated.
They are kept in a second collection.
This second collection is a collection of categories.
Each category can contain child categories.
Each task can appear only in one category.
This means that every single ITask object in the ITask collection is somewhere inside the categories.
I'm using this implementation to allow the user to filter the ITask objects by categories, and by other means which are not relevant.

OK... Now I want the tasks to be "restored" when the program next runs, so I serialize and deserialize them... So far so good...
I want to serialize the collection of categories the user have created, and restore them too... I can serialize the categories collection as well, but what will happen to the ITask objects when I deserialize the categories?
Will they point to the same objects deserialized to the ITask collection?

Hope this is clear enough... Smile | :)

If you have any other ideas regarding how to better store the collections, I'd be more than happy to hear them. Smile | :)

Thanks in advance,
Shy.

Re: Serializing the same object instance twice... [modified]

Martin#20-Jun-07 0:20

Martin#

20-Jun-07 0:20

Hello,

shyagam wrote:
Will they point to the same objects deserialized to the ITask collection?

No, I don't think so.
You will then have the double number of ITask objects!

I would store one Collection and additionaly the way the second collection was sorted.
After deserialization you fill the second Collection with the ITask objects of the first, and Sort it again!

All the best,

Martin

-- modified at 6:39 Wednesday 20th June, 2007
The advantage of storing the way you are sorting (with an enum for ex.), is that you are allways consistend with updated programs in combination with old datas.

Re: Serializing the same object instance twice...

welbers20-Jun-07 0:29

welbers

20-Jun-07 0:29

Hello,

if you serialize the collections using 2 Serialize() calls, you would end up with duplicates of each ITask object. I would do something like this (in C#):

[Serializable]
public class DataStore
{
  public ICollection Tasks;
  public ICollection Categories;
}

Serializing this class will keep the references correct and will not produce duplicates.

greetings,
Enno Welbers

Re: Serializing the same object instance twice...

Shy Agam20-Jun-07 0:38

Shy Agam

20-Jun-07 0:38

Thank you both.
Very helpful indeed... Smile | :)

Shy.

flicker free fast moving images

wolf70719-Jun-07 23:53

wolf707

19-Jun-07 23:53

Hi folks,

I want to display a histogram with a high refresh rate. Therefore I paint the new data into a bitmap (bmpOffScreen) with graphics.draw... and copy an Image of the old data (bmpBackupScreen) into bmpOffScreen (g.drawImage()) that I use for double buffering. Than I paint the bmpOffScreen in the OnPaint function and save a copy of bmpOffScreen at bmpBackupScreen. The image is a little bit shifted to make room for the new data set.
It works fine but is flickering. I tried to implement an additionel double buffering bitmap. But it was not helpful. Do anybody knows how I supress the flicker?

Wbr,
el

Re: flicker free fast moving images

Martin#20-Jun-07 0:03

Martin#

20-Jun-07 0:03

Hello,

I think this article shows it best:
http://www.codeproject.com/csharp/DoubleBuffering.asp[^]

All the best,

Martin

Customizing the grid columns

minkinin19-Jun-07 23:23

minkinin

19-Jun-07 23:23

hi everyone.
please I am newbie.
I am having a grid which is bound to different lookup tables,
i want to add new rows depending on the number that is captured by a user in a textbox.
eg.if the number in texbox is 4 the grid should automatically have 4 blank rows.

please help.
REgards

Use of trignometric func.??-----------help urgent

Raza568019-Jun-07 23:17

Raza5680

19-Jun-07 23:17

hey..
I am working on a drawing application(using openGL)
how to use trig. functions sin, cos in c-sharp etc.......the error is displayed 'Sin/cos does not exist in current context...

how to use these and other maths functions.

thanks

Re: Use of trignometric func.??-----------help urgent

Giorgi Dalakishvili19-Jun-07 23:28

Giorgi Dalakishvili

19-Jun-07 23:28

The functions are in the Math class

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my articles
#endregion

Zooming in C# using opengl

a_david12319-Jun-07 22:48

a_david123

19-Jun-07 22:48

Dear All

I have a program for line drawing in C# using CSGL(OpenGL), now i want to Zoom in and out that drawing line in openGL from the menu or from the Zoom button

kindly any one help me?

Regards Cry | :((

David

david

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