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Hi All,
I'd like to make a separate thread in inserting of data into the Custom Collection I have and fires an event when its done so it would be bound to a grid.
Is it possible?
here is my example code.
public class Details : List<Details.Detail>
{
public delegate void _WorkComplete();
public event _WorkComplete WorkComplete;
public void AddDataSource(object value)
{
Thread worker = new Thread(new ParameterizedThreadStart(dowork));
worker.Start(value);
}
private void dowork(object value)
{
ArrayList list = (ArrayList)value;
foreach (Item item in list)
{
this.Add(new Detail { FIELD1 = item.Code1, FIELD2 = item.Code2 });
}
if (WorkComplete != null) WorkComplete();
}
public class Detail
{
private string field1;
private string field2;
public Detail()
{
field1 = string.Empty;
field2 = string.Empty;
}
public string FIELD1
{
get { return field1; }
set { field1 = value; }
}
public string FIELD2
{
get { return field2; }
set { field2 = value; }
}
}
}
so in the UI side i could do
private Details details = new Details();
protected void Page_Load(object sender, EventArgs e)
{
details.OnWorkComplete += new Details._WorkComplete(details_AddComplete);
details.AddDataSource(source1);
details.AddDataSource(source2);
}
void details_AddComplete()
{
grid1.DataSource = details;
grid1.DataBind();
}
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Search in google for cross-thread-exception. You cannot change something in control from another thread.
"grid1.DataSource = details;" -> Cross Thread Exception
void details_AddComplete()
{
Invoke(new MethodInvoker(AddComplete));
}
void AddComplete()
{
grid1.DataSource = details;
grid1.DataBind();
}
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that does not fire an error the "details" is created on the same thread. as the "grid1".
not the comment I expected but thanks for the reply.
modified on Wednesday, August 12, 2009 5:07 AM
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Assuming you add all your sources in Page_Load, you could do this:
In AddDataSource, just add the source to a collection inside Details.
Add a method Details.StartProcessing() which starts the background work.
So Page_Load would look like:
details.AddDataSource( source1 );
details.AddDataSource( source2 );
details.StartProcessing();
}
As Stan said, your event will be fired on the background thread. Either use a BackgroundWorker instead of a Thread, or use Invoke before you update the grid.
Nick
----------------------------------
Be excellent to each other 
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Hi,
I want to perform an action before the beginning of an application installation.
I tried to override the event OnBeforeInstall (in the AddInCustomAction class) but I see that when that event is raised my files were already copied to the target directory.
The reason for what I want to do is:
I have a previous version of the application (without setup; just an exe) written in MFC.
Now I rewrite the application in C# .Net VS 2005, and the installation is done via a setup.
I don't want to change the name of the exe and nor the name of the Target directory.
so what I want to do is:
before the installation begin:
check that the previous verion doesn't exist.
if exists, remove the old exe
continue the installation
Any Ideas How can I do this?
Thanks,
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Hello.
more detail:
I have a datagridview and i written save code for it ,but when i change the fied of datagridview Rows for test my save code,after i chenge field(immediately)and i press Eter key ,that row i chenged it be removed from datagridview,before i press save button .So i cann't save the changes.
But if i change the last row of datagridview this row not remove ,and i can save it exactly.
I do not know why other rows after change to remove.?
this is my save code:
private void myBindingNavigatorSaveItem_Click(object sender, EventArgs e)
{
SqlConnection objconnection = new SqlConnection(myconnection_string);
int i, idj, tedad, ghimat;
for (i = 0; i < myDataGridView.RowCount; i++)
{
idj = int.Parse((myDataGridView.Rows[i].Cells[0].Value).ToString());
tedad = int.Parse((myDataGridView.Rows[i].Cells[1].Value).ToString());
SqlCommand mycommand = new SqlCommand("UPDATE table1 SET tedad = @tedad WHERE (fid=@fid AND idj = @idj AND tedad ='0')", objconnection);
mycommand.Parameters.AddWithValue("@fid", fid);
mycommand.Parameters.AddWithValue("@idj", idj);
mycommand.Parameters.AddWithValue("@tedad", tedad);
objconnection.Open();
mycommand.ExecuteNonQuery();
objconnection.Close();
}
}
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I have these two applications, one of which sends a screenshot image to the other. This works smoothly on most PCs, however some (older) PCs start receiving a lot of zeros after reading some of the data. How can I ensure that all the data being sent, is read? I don't know if this is a timeout issue, or what?
(I have found some solutions, such as WriteByte / ReadByte, but I need it to perform quite fast too, if possible)
The methods are as follows:
Sending:
if (nsStream.CanWrite)
nsStream.Write(bUp, 0, bUp.Length);
nsStream.Flush();
int x = 0;
while (nsStream.DataAvailable && x < dataReadWait)
{
x++;
}
return true;
Receiving:
if (nsStream.CanRead)
nsStream.Read(bDown, 0, bDown.Length);
nsStream.Flush();
return bDown;
At this point, it is worth saying that the Sender prior to sending the actual image, sends the length of the image (which is assigned to bDown), that is why data is read until the length of bDown...
Any help is so greatly appreciated!
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I have sql (sql server 2005) table which is having StartDate and EndDate datetime columns.
<code>StartDate value inserting as 2009-08-11 00:00:00.000,
EndDate value inserting as 2009-08-11 23:59:00.000 (End of the day).</code>
This DB Server is located at london.
in my winforms(2.0) appliction i have typed dataset, is having same table schema.
Typeddatasset StartDate and EndDate DateTimeMode property set to UnspecifiedLocal.
i am populating this dataset with SP. SP is functioning properly.
returned data i am binding to DataGridView. when its biinding to datagridview,
<code>StartDate is showing as '8/11/2009 4:30 AM' instead of '8/11/2009 12:00 AM' and
EndDate is showing as '8/12/2009 4:29 AM' instead of '8/11/2009 11:59 PM'</code>
it seems problem is with databinding to dataset.
any sounds?
Ramana
modified on Wednesday, August 12, 2009 4:15 AM
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Ramana. G.V wrote: This DB Server is located at london.
Where are you? I would guess it's just a time zone issue, that it's adjusting for your local time zone. Some very smart people worked very hard to make it work that way and now you say you want it the other way?
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yes, if you have any other way to do. please help me
Ramana
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I thought I had my Regular Expression working just fine, but then I found a weakness...
First off, I'm trying to parse a command line, so a Regex may not be the best tool, but it's so close! (And it's fine for testing purposes anyway.)
Given a command line like:
command param1 /options=( option1 , "option 2" , option3 ) "param 2"
I have no trouble getting most of this. Generally the worst part is that I have to get the contents of the options all together,
e.g. " option1 , "option 2" , option3 ", but that's not a big deal, I can parse it separately.
What I'm stumped by now, is if an option is in quotes and contains a right-parenthesis:
/options=( "(trouble)" )
The related piece of the Regex I'm using is:
"(?:/\\s*(?'Switch'\\w+)(?:\\s*=\\s*(?:(?:\"(?'Value'[^\"]*)\")|(?:\\((?'Value'[^\\)]*)\\)))|(?'Value'\\w+))?)"
I want "(trouble)", I get "(trouble
Is there a way to get the Regex to recognize that the right-parenthesis is in quotes? I assume I need a balancing-group, but I can't wrap my head around it.
Edit:
I replaced ((?'Value'[^\\)]*) with (?'Value'(?:(?:\"[^\"]*\")|[^\\)]*?)*) and it seems to work.
modified on Wednesday, August 12, 2009 1:51 AM
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hi,
I've some table of content or data. I've to show the content as table and charts in PDF using C#. Is there any possibility to display charts in PDF using some third party Dlls.
Pls let me know the solution.
Thanks in advance..........
-Ravi Vellanki
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Hi all,
I need help from u all. I'm using tab controls in my program and added tab pages. Now my problem is i have to add menu items to that tab pages.Is it possible to add menus to tab pages.
If it is possible plz help me with some code...
Thanks in advance...
Elizabeth........
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Hello All ,
I have design a factory class which will create the objects and send to the calling party. but i have small concern . Please see this code
public ElectricalDevice CreateDeviceType(int DeviceCode)
{
ElectricalDevice lobjDevice = null;
if (Convert.ToInt32(Helper.DeviceType.Fan) == DeviceCode)
{
lobjDevice = new Fan();
}
else if (Convert.ToInt32(Helper.DeviceType.Motor) == DeviceCode)
{
lobjDevice = new Motor();
}
else if (Convert.ToInt32(Helper.DeviceType.Tubelight) == DeviceCode)
{
lobjDevice = new Tubelight();
}
else
{
lobjDevice = new IronBox();
}
return lobjDevice;
}
This method is creating device and sending .
but my question is that if 2mrw i have to add some more device again i need to add more if else condition
So which pattern should i follow . Please give me some goood design links where can i have the video
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 What in Bob's name is that?! That looks totally bassackward to begin with.
If Helper.DeviceType is an enumeration then:
0) Why not send DeviceCode in as a Helper.DeviceType in the first place?
or 1) Cast the DeviceCode to Helper.DeviceType? (Helper.DeviceType) DeviceCode
2) Why are you using Convert.ToInt32 when a simple cast will do? (int) Helper.DeviceType.Tubelight
2.0) Don't ever use Convert, it's needless.
3) Then you can use a switch instead of a bunch of freakin' ifs.
switch ( DeviceCode )
{
case Helper.DeviceType.Fan : ...
}
or
switch ( (Helper.DeviceType) DeviceCode )
{
case Helper.DeviceType.Fan : ...
}
At least then your code will be readable and you can start looking for a better solution.
It appears you have a lot to learn about C# and just basic programming, I really hope you don't actually get paid to write code like this.
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Hello ,
even if u are going for switch also . if 2mrw any device added then again u have to write obne more case statement ...
So that does not solve my problem
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jpk420 wrote: that does not solve my problem
Indeed, which is part of why the Abstract Factory design pattern was defined. So, let's step back, what exactly are you trying to do?
Where does the DeviceCode come from?
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Hello,
new to encryption.
however i am using the following partial code to encrypt and decrypt and it works....
<br />
<br />
<br />
byte[] encrypted = encryptStringToBytes_AES(txtMessage.Text, myRijndael.Key, myRijndael.IV);<br />
<br />
<br />
<br />
string decipheredText = decryptStringFromBytes_AES(encrypted, myRijndael.Key, myRijndael.IV);<br />
<br />
so this is an MSDN example and it works!!! i get the same thing if i DONT manipulate the byte[] any.
now the fun parts....
i try to do this
<br />
<br />
byte[] encrypted = encryptStringToBytes_AES(txtMessage.Text, myRijndael.Key, myRijndael.IV);<br />
<br />
<br />
string ciphertext = Encoding.UTF8.GetString(encrypted);<br />
<br />
byte[] cipher = Convert.FromBase64String(ciphertext);<br />
<br />
<br />
<br />
string decipheredText = decryptStringFromBytes_AES(cipher, myRijndael.Key, myRijndael.IV);<br />
<br />
<br />
<br />
as you can see i added 2 extra lines, and encoded to get back to a string. then converted to base 64 to get back to a byte []. YES i transmit the data in between those two lines but i made it simple to troubleshoot. this DOES NOT work..... i have tried diff encodings like UTF8 etc.
help!!
10 million dollars to the one who gets it working hahaha
thanks!
modified on Tuesday, August 11, 2009 11:32 PM
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This is non-sense. You have an encrypted string in a byte array.
1. There is no guarantee that such byte array represents a string, yet you call Encoding.XXX.GetString() on it.
2. You have no guarantee that the result only contains characters from a limited set (the 64 characters acceptable in a Base64 string), yet you call Convert.FromBase64String() on the string.
Of course this does not work. There are two reasons it does not have to work.
Luc Pattyn [Forum Guidelines] [My Articles]
The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.
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ahhhhh i seee what you are saying... hmmmmm
i need to send the byte[] over a streamwriter.....
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i get the 10 million dollars!!!!!!!!!!
i solved it!!!!!
this is like the most common problem in cryptography on the NET!!!
heres the code fix:
basically this fixes problems with you cant convert from base64string
<br />
<br />
<br />
byte[] encrypted = encryptStringToBytes_AES(txtMessage.Text, myRijndael.Key, myRijndael.IV);<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
char[] base64data = new char[(int)(Math.Ceiling((double)encrypted.Length / 3) * 4)];<br />
<br />
Convert.ToBase64CharArray(encrypted, 0, encrypted.Length, base64data, 0);<br />
<br />
string ciphertext = new String(base64data);<br />
<br />
byte[] cipher = Convert.FromBase64String(ciphertext);<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
string decipheredText = decryptStringFromBytes_AES(cipher, myRijndael.Key, myRijndael.IV);<br />
<br />
chatbox.Text = decipheredText;<br />
<br />
<br />
the good conversions are in the middle between the spaces.
it works!!!!
tnx for all the help
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try something like this:
using System.Drawing.Drawing2D;
private bool clearImage = false;
protected override void OnPaint(PaintEventArgs e)
{
if (this.clearImage)
{
using (Pen clearPen = new Pen(this.BackColor))
{
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.DrawEllipse(clearPen, 100, 100, 2, 2);
this.clearImage = false;
}
}
else
{
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.DrawEllipse(Pens.Red, 100, 100, 2, 2);
}
}
then your button click event
this.clearImage = true;
this.Refresh();
Hope this helps.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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