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Depends where the code is. Obviously, whatever construct you're using ( data reader, data table, etc ), you're not checking if it has data in it before you try to read it.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I have a class that inherits from the datagridview component and within this class i am setting the datasource. My problem isthat the datasource is very large and i get a System.OutOfMemory Exception. I want to prevent the rows from populating at designtime. My code is below:
<br />
public class MembersView:DataGridView<br />
{<br />
public MembersView()<br />
{<br />
this.DataSource = Customer.Instance.GetAllCustomers();<br />
}<br />
}<br />
I still want the designer to show my the columns. Ay suggestions?
-- modified at 16:02 Sunday 18th November, 2007
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Check the DesignMode property
if(DesignMode)
DataSource = Dummy
else
DataSource = Customer.Instance.GetAllCustomers();
only two letters away from being an asset
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I came across this little unknown facet of .net a few days ago and today I decided to build a sample application to test this out. I followed the instructions as to how to apply SNIP specified on this site: http://www.morganskinner.com/Articles/StrongNameIdentityPermission/[^]
When I called my assembly in an unsigned project, it failed to give me any warning and my method from my signed class library executed.
Is this is happening because the signed class library is running in full trusted zone ?
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I create bitmap;
Bitmap myBitmap = new Bitmap(150, 50);
Graphics g = Graphics.FromImage(myBitmap);
And draw picture;
g.FillRectangle()
g.DrawString()
I use myBitmap.Save() method and show image using IMAGE component img.ImageUrl = "..."; property.
But I don't want to save image. How can I show bitmap without using save() function ?
Best Regards...
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Have you tried Graphics.DrawImage ?
only two letters away from being an asset
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Assign the bitmap to the Image property of the control.
Experience is the sum of all the mistakes you have done.
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I use Visual.net 2005. And I use image control (component) on asp.net web site.
How can I assign the bitmap to the Image property of the control ?
Best Regards...
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Oh, it's an ASP.NET question.
Then you can't do it that way. The browser will fetch the image in a separate request, so you will have to create the image in a separate page.
Make a page that creates the image and sends it to the response stream, then use the name of that page as url in the image control.
Experience is the sum of all the mistakes you have done.
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The ASP.NET forum is the place for ASP.NET questions. Why would anyone assume from your original post that this was an ASP.NET question ?
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Sorry, but this question is releated about image processing. Accually, all question releated about .NET classes, so all question move to .NET framework message board. Isn't it ???
Best Regard...
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No, this question has absolutely nothing to do with image processing.
1 - drawing on an image is not image processing, and
2 - your question is how to pass an image you have created in memory into a web page, right ? That's an ASP.NET question. Rendering it in a winforms app is both trivial, and completely different. That's why all the initial answers you got were useless to you. And that's my point. I don't care where you ask, there is some crossover, a lot of questions in the ASP.NET forum *are* C# questions. But, asking this question in this forum has meant it's taken you longer to get towards an answer, as people assumed you were asking something different.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Actually If I use oBitmap.Save(Response.OutputStream, ImageFormat.Jpeg); so image created without physically. But how to initialize Image1.ImageUrl = "??????".
Best Regards...
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There are two ways to do this:
1 - with a HTTPHandler that passes back the image
2 - by saving the image to your file system first.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Christian Graus wrote: There are two ways to do this:
1 - with a HTTPHandler that passes back the image
2 - by saving the image to your file system first.
Or perhaps the most obvious:
3 - with a page that passes back the image
Experience is the sum of all the mistakes you have done.
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using System;
public class AvgPrime
{
public static void Main()
{
double c=0,y=0,p=0;
int i,j;
bool isPrime;
for(i=2; i <= 100; i++)
{
isPrime = true;
for(j=2; j <= i/2; j++)
{
if(i % j == 0)
{
isPrime = false;
}
}
if(isPrime)
{
y = y + 1;
c = c + i;
}
}
p = c/y;
Console.WriteLine("The avg of all prime numbers from 1 to 100 is {0}",p);
}
}
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Oh come on, if this isn't homework, what else is?
Some people never learn... 
Regards,
mav
--
Black holes are the places where God divided by 0...
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How about adding some explanatory text lines that start with a double slash?
Things I would like to know:
- why are c and y of type double?
- why is i incremented by one?
- why is j limited to i/2?
- why does the for(j) loop continue when a divisor has been found?
- why are most identifiers single-character?
Luc Pattyn [Forum Guidelines] [My Articles]
this months 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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i am working on compiler......i want to know the details about lexical analysis......is there any code avaliable which performs lexical analysis ofC++ or c#
waiting for reply
thanks
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Lexer in C#, or for C# (in C++)? If the latter suffice, take a look at Shared Source Common Language Infrastructure[^]
[ My Blog] "Visual studio desperately needs some performance improvements. It is sometimes almost as slow as eclipse." - Rüdiger Klaehn "Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe
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I have a button called AddItem so i want whenever the button is got
clicked new row shud be inserted on the table forexample when page is
loaded there is no any row when user click the button one row shud be
added when second time he clicks another row shud b inserted in the
table control but the problem is at first time it inserts the row bt
whn i click second time no row is inserted it shows only one row no
matter how many times u click the button.
I have addRow method in button click event which adds the row in the
table when called. this situation is in c#.
Actually i can make this in javascript but the problem is javascript
cant create server side controls for example asp:textbox nd so on . i
need to access the controls in each row through c# code so i cant
achieve all the objectives in javascript.
I hope u got understood wht the prob is..
I just want there shud be a function like addRow which adds the row in
table when it is called in C# code
any help will be greatly appreciated
Aftab Ali Shaikh
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You have to update the viewstate after adding the control. Have look at this[^].
Right now on every postback your page is loosing the previously added controls that's why it add only single row every time you click the button. You might have to have some counter for the clicks.
-----
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thanks for the replay SABhatti
u r right its loosing information on every post i did refered the example u told bt same is happening over here can u give me some example in coding form a very simple example one button and textbox when u click button textbox shud b added every time u click the button new textbox shud b added
any help will be greatly appreciated
thanks in advance
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Well ShaikhAffi, I have not tried anything like this but quickly I can give you one idea (there are definitely other ways too but right now I can give you this which will definitely work).
keep a hidden field or session variable, every time user clicks the button increase that field by 1 (on the server side not on the client) now in page load do this:
<br />
if(!IsPostBack)<br />
preserveControls()<br />
<br />
protected void preserveControls()<br />
{<br />
int noOfControls = (hiddenfield.Value.Length > 0) ? (int)hiddenfield.Value : 0;<br />
if(noOfControls > 0)<br />
for(int i=0; i < noOfControls; i++)<br />
{
}<br />
<br />
and in button ClickEvent add the control and increment the hiddenfieldValue by 1
-----
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