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Thanks so much for you guys's response.
I will try your suggestion tomorrow.
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Hello,
In my WinApplication, Sometimes I get error "Concurrency Violation" When I try to Update the datagrid after manipulating a datagridview. Well, when it happens, I see no way to restore regular state of the application other than closing the application and restarting again. I can handle the Excpeption and show my user that an error occurred, well, but then what, is not there any well managed way to avoid this problem and restore the state of the application ? This data table was not being modified by any other thread. So, I was wondering why sometimes I am getting this error and how to avoid it,
Thanks and regards
Emran
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One reason I believe is if you have your database engine creating unique key column values for rows. In SQL Server it is an IDENTITY type in MS Access I think they call it AutoNumber type, not sure.
So a DataSet generates it's own value for these columns since it is disconnected. Then the engine assigns it's value and if they are different it breaks. Search MSDN for key words DataSet and @@IDENTITY to see example of how to use the RowUpdate event etc. to solve this problem.
Another might be if you used the Visual Studio Schema Generator to create a Typed DataSet the generated Command object SQL Statements for Update and Delete may contain where clauses for every column. You can edit those Statements (in the Properties window of the DataSet) and remove all those extra clauses.
Hope that helps
led mike
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Well im going to try to ask this question in the most understandable way... This is what im trying to do: I have a Rich Text Box on a form. When you drag a file onto the rich text box (Presumably a text file) it opens it and copies all of the text onto the rich text box. Im thinking that it will somehow have to find out the location of the file, open it and use stream reader to read it. If anyone has ANY suggestions please write a message. Thank You 
MWA HAHAHAHA I AM A NOOB AND WE NOOBS WILL KILL YOU ALL. JK
Whats intresting is that im only 12 years old :P
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You are correct. Do something like this:
public Form1()
{
InitializeComponent();
richTextBox1.DragEnter += new DragEventHandler(richTextBox1_DragEnter);
richTextBox1.DragDrop += new DragEventHandler(richTextBox1_DragDrop);
}
void richTextBox1_DragDrop(object sender, DragEventArgs e)
{
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
if (files.Length > 0)
{
try
{
System.IO.StreamReader r = new System.IO.StreamReader(files[0]);
richTextBox1.Text = r.ReadToEnd();
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Error opening file " + files[0] + ":\n"+ex.Message);
}
}
}
void richTextBox1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop, false))
{
e.Effect = DragDropEffects.All;
}
}
Hope this helps,
DigitalKing
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What are the realtime scenarios where Preprocessor Directives are required?
San
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Conditional compilation, for one.
Keep in mind that C# does not have a preprocessor per se.
Cheers,
Vikram.
I don't know and you don't either.
Militant Agnostic
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Hi,
I have MSDE,if instance is local then database is restoring properly.
If iam trying to restore any other particular instance of MSDE ,error is coming.
it is adding database to my particular instance,but while restoring it is searching for local instance log and mdf files.
iam using SQLDMO.Restore object to restore,i searched a lot.
any one give me the solution.
Thanks in advance.
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When the Handle of the control of another application is known,
I can get Font object of a win32 control of another application(Different process) by SendMessage(hwnd,WM_GETFONT....) & Graphics class.
But when the target control is a WinForm control(.Net control) of another application, I can't get the HFont from SendMessage(hwnd,WM_GETFONT).
So, I guess the font is not stored in the Device Context(HDC) for a winForm control. Am I Right?
Then How Can I get the Font from that winForm control?
The purpose to do so is that I want to measure the string size of controls in other applications.
Any idea?
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Hello
I have a problem with binary image segmentation in c#.
First, I have to open it, display and then divide into blocks of size m*n.
A binary container image F is regularly partitioned into small pixel blocks Fi of a size m×n (for simplicity, assume that F’s size is a multiple of m×n). Then I have to make some operations on these blocks( matrices of size m*n) such as XOR. Next,I have to generate random matrix of size m*n and XOR it with all the blocks of image F.
So, these are the steps I have to make:
1.Open and display binary image
2.Image segmentation into blocks of size m*n
3.Generate random matrix k ( size m*n) and XOR with all blocks of F (size of m*n)
All help will be very helpful because now Have no idea what to start with
Thanks
Peter
Pete
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hi all
I have this code:
foreach (PropertyInfo pi in this.GetType().GetProperties())
{
if (pi.Name != "Ds" && !pi.Name.Contains("nmv") && !pi.Name.Contains("Nmv") && pi.Name != "NewId" && pi.Name != "SpeakerID")
nmvParams.Add("@" + pi.Name, pi.ToString());
}
"this" is my object that contains all the properties. I need to put the name & values
of each property into a namevaluecollection nmvParams.
pi.Name gives me the name of the property. How do I get the actual value?
pi.ToString() just gives me the name of the property in string.
thanks
M
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object propval = pi.GetValue(this, new object[0]);
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thanks. I figured it out, its actually
pi.GetValue(this, null)
but you have to check for null before you run it.
M
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Hi i was wondering if someone can help me with getting the data of a subkey and storing it in a string. I understand how to get the value but i need to have it shown in a textbox (or string)
RegistryKey rk = Registry.LocalMachine.OpenSubKey("Software\\mysoftware");
rk.GetValue("aPath","C:\\music\\");
thanks for your help
Don't be overcome by evil, but overcome evil with good
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RegistryKey rk = Registry.LocalMachine.OpenSubKey("Software\\mysoftware");
string text = (string)rk.GetValue("aPath","C:\\music\\");
myTextBox.Text = text;
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Is Jesus the Jewish Messiah?
The apostle Paul, modernly speaking: Epistles of Paul
Judah Himango
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thanks alot man i appreciate it!
Don't be overcome by evil, but overcome evil with good
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I have a program for which I want to implement file IO with .mdb files. However, MS Access tells me that a single text field can't have more than 255 characters. Is there a way around that?
Basically, the file has a kind of collection of objects that each contain RTF information (a "document"). I want to use the benefits of a database, and I don't want to have to save the RTF information into an undetermined number of RTF files.
(as you can probably guess, I'm new to databases in C#)
Any ideas?
-Daniel
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Use a Memo field.
---
b { font-weight: normal; }
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Awesome! Thanks!
[sits back down on newbie chair and goes to work]
-Daniel
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Hi there,
I am working on creating a dynamic control which displays a collection of images.
I want to display 4 images per rows and the rows must be calculated based on the number of images.
For example if we have nine images in the collections there should be 3 rows and four images per row.
So i want to creat the rows and columns dynamically and load the images also dynamically. \
How do i go about.
Thanks in advance,
Jo
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I think he wanted to create it form scratch.
------------------------------
"The Soapbox has been so ..."
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JoJuPi01 wrote: I want to display 4 images per rows and the rows must be calculated based on the number of images.
Divide the Collection.Count property by 4, and if there is no reminder then the result will be the rows count, otherwise the rows count will be the result + 1.
JoJuPi01 wrote: So i want to creat the rows and columns dynamically and load the images also dynamically. \
Try to do it by yourself and if there is any problem, just post a new thread here.
------------------------------
"The Soapbox has been so ..."
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Currently, I am working on ZX2C4 Instant Messenger. ( http://zx2c4-im.sf.net ). For file transfers, a connection class raises an event for every 1024 bytes it receives (and finally length%1024 bytes at the end). This event is picked up by a form that has a progress bar.
Everytime the event is called, I make the progress bar's value maximumvalue * (bytes trasfered/total). However, I lack a good way to compute the number of kb/s at which the file is downloading.
Currently, when the progress bar is created, I assign a global varible called "start" to DateTime.Now, and every time the update event is signaled, I make the current speed equal to (bytes transfered) / (DateTime.Now - start).
While this works, it only provides the average speed of the whole download. What is the best way to calculate the current speed of the download?
Jason A. Donenfeld
ZX2C4 Instant Messenger
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zx2c4 wrote: What is the best way to calculate the current speed of the download?
Since the event is conveniently raised after every 1KB is downloaded, I believe this is simply the 1/(ti - ti - 1) where "t" is the wall clock time.
/ravi
My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com
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