|
Make a datatable. Make the customer id field primary key and set its autoincrement property to true.
Ahsan Ullah
Senior Software Engineer
|
|
|
|
|
nt_virus wrote: Backend will be SQL Server..
Use identity column for customer id.
|
|
|
|
|
|
Can u provide a sample code to generate GUID?
|
|
|
|
|
|
|
Try googling or MSDN once in a while, you could have found it in 5 minutes if you tried...
|
|
|
|
|
So I have this idea in my head that will make work easier. Many companies are now implementing web applications. This can be annoying at times. Below I listed some problems and solutions I have with web applications. I am wondering if I should create a stand alone C# application that will run in the task bar to collect any IE windows that have a specific URL or if I should create an IE Addin. The only problem with creating an Addin, is we might be locked down from installing addins, due to virus/spyware. Also, any ideas YOU have, please feel free to share. If I do get a program like this up and running I will share the source code. Thanks, Chris
Problem A:
If you access an external link (ie, from Excel or messaging program) a new web browser will open up.
Solution A:
Use Application/IE Addin to collect IE windows that have the same begining URL (which you could set in a config file)
---
Problem B:
If you are idle for two long your session times out and are asked to log back in before you can resume.
Solution B:
The Application/IE Addin will notice you have gone back to the login page and automatically log you back in. NOTE: We do not want to save the login information; but rather keep it as a varriable in the Application/IE Addin
---
Problem C:
Sometimes if you have lag to the web server you will get a page can not load error and you lose all the date you typed in a web text box.
Solution C:
Everytime you leave a page the applcation/IE Addin will copy the text to your clipboard.
|
|
|
|
|
Can someone please explain me what the above 3 are & how are they to be used in development & how they interact with each other.
Thanks.
|
|
|
|
|
|
I am going to make it simply afterwords read more about it and download sample codes.
A DataGridView is use to display/report data the you have stored somewhere.
DGV is a gentlemen because display everthing regardless of the kind of datatable or dataset, meening that you dont need to create a "suit" that matches 100% your dataset scheme, it loads everthing!!!
For exemple, you can display/report data in crystal reports to, but here, you have to create a dataset scheme to fit your data!!!
A Dataset is a scheme, like: id(int),f_name(string),l_name(string),birth_date(date), it has to match the scheme of what you are loading, a sql databable for exemple, the fields as to be the same kind to fit!
A Datatable is part of a database, nothing here very fancy to know. Sometimes in C# in runtime you dont need to create the database and after the datatable, if you only need 1 datatable.
So, like you see DGV displays data from a datatable that as a dataset scheme, but in others objects like a crystal_report, you need to make a scheme to match the scheme of the datatable you are loading!!! got it???
Good Luck
nelsonpaixao@yahoo.com.br
trying to help & get help
modified on Thursday, October 23, 2008 8:58 PM
|
|
|
|
|
Hi All
Im trying to create a application that can connect connect to he exchange server. In my application i want to add a appoitment,Task List,Calendar. And all that need to connect to Exchange server.
if any one know can you please help me out
Thanks in advance
|
|
|
|
|
Hi, Im trying to define some custom events within one of my classes.
I have set the delegate and the event as follows:
<br />
public delegate void SegmentProgressUpdate();<br />
public event SegmentProgressUpdate ProgressUpdate;
That is just above my constructor.
It compiles, But at runtime when the event gets called I get the "Object reference not set to an instance of an object." Error.
Im sure i am doing something wrong, But i cant see what. I have read a dozen tutorials on custom events online, that all only have what i have above. And i have googled the error related to events but cant find a solution that works.
Does anyone have any idea?
|
|
|
|
|
Abydosgater,
I guessing you don't listen to the event. When you fire the event, check its not null.
if (ProgressUpdate != null)
ProgressUpdate();
Also, its best to try and stick to .net conventions when possible, so your delegate should take 2 params.
public delegate void SegmentProgressUpdate(object sender, EventArgs e);
Sender is the object calling the event, and the event args is the class with the information you'd like to pass, if you don't pass anything, just do a: EventArgs.Empty
Regards,
Gareth.
(FKA gareth111)
|
|
|
|
|
Thanks for the quick reply Gareth.
I have tried this, and it still doesnt work. It doesnt crash with the error but as you will see:
<br />
SegmentOne.ProgressUpdate += new Segment.SegmentProgressUpdate(SegmentOne_ProgressUpdate);
Im listening to the event, Thats in my main application, And i have changed it to this:
<br />
if (ProgressUpdate != null)<br />
{<br />
ProgressUpdate(this, System.EventArgs.Empty);<br />
}<br />
else<br />
System.Windows.Forms.MessageBox.Show("error segment.cs:109");
But now all it does is throw the error message box.
|
|
|
|
|
Abydosgater,
When do you listen to the event?, once you've created SegmentOne? or...?
Regards,
Gareth.
(FKA gareth111)
|
|
|
|
|
Yes once i have created the SegmentOne Object.
<br />
SegmentOne = new Segment(SegmentOneStart, SegmentOneEnd, this._webRequest);<br />
SegmentOne.ProgressUpdate += new Segment.SegmentProgressUpdate(SegmentOne_ProgressUpdate);
Hmm
|
|
|
|
|
You've got something screwy going on somewhere in your code.
This is a simple sample that has 2 events - one with custom event args.
public class TestA
{
public event EventHandler Property1Changed;
public event EventHandler<TestEventArgs> Property2Changed;
public int Property1
{
set { OnProperty1Changed(); }
}
public int Property2
{
set { OnProperty2Changed(value); }
}
protected virtual void OnProperty1Changed()
{
if(Property1Changed!=null)
Property1Changed(this, EventArgs.Empty);
}
protected virtual void OnProperty2Changed(int value)
{
if (Property2Changed != null)
Property2Changed(this, new TestEventArgs(value));
}
}
public class TestEventArgs : EventArgs
{
public TestEventArgs(int value)
{
m_Value = value;
}
private int m_Value;
public int Value
{
get { return m_Value; }
}
}
You can instanciate, subscribe to the events and set the properties to raise the events like:
TestA testA = new TestA();
testA.Property1Changed += new EventHandler(testA_Property1Changed);
testA.Property2Changed += new EventHandler<TestEventArgs>(testA_Property2Changed);
testA.Property1 = 1;
testA.Property2 = 2;
then the methods called above
void testA_Property2Changed(object sender, TestEventArgs e)
{
Console.WriteLine("Property 2 Changed to: " + e.Value);
}
void testA_Property1Changed(object sender, EventArgs e)
{
Console.WriteLine("Property 1 Changed.");
}
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
|
|
|
|
|
Ive taken a look at that example, and i have added a full new test event to try it using the code above as an example.
public event EventHandler TestEvent;<br />
<br />
if (TestEvent != null)<br />
TestEvent(this, System.EventArgs.Empty);<br />
else<br />
System.Windows.Forms.MessageBox.Show("Event returned null");<br />
<br />
<br />
SegmentOne = new Segment(SegmentOneStart, SegmentOneEnd, this._webRequest);<br />
SegmentOne.TestEvent += new EventHandler(SegmentOne_TestEvent);
But as before, its just returning that the event is null and not calling it. even though i am listening for it.
|
|
|
|
|
Abydosgater wrote: within my constructor
If it's in the constructor - then the object instance may not yet created, and even if it is, the listener SegmentOne.TestEvent += new ... has not yet been attached so it will be always be null at that point.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
|
|
|
|
|
I think the only way you can raise an event in the constructor that can be listened to is using a static event.
public class TestA
{
public static event EventHandler ConstructorCompleted;
public TestA()
{
OnConstructorCompleted(this);
}
protected static void OnConstructorCompleted(TestA instance)
{
if (ConstructorCompleted != null)
ConstructorCompleted(instance, EventArgs.Empty);
}
}
TestA.ConstructorCompleted += new EventHandler(TestA_ConstructorCompleted);
TestA testA = new TestA();
void TestA_ConstructorCompleted(object sender, EventArgs e)
{
if (sender is TestA)
{
Console.WriteLine("OK");
TestA.ConstructorCompleted -= TestA_ConstructorCompleted;
}
}
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
|
|
|
|
|
|
Thanks to Davie and Giorgi Dalakishvili i figured out the issue.
As Davie said above, It was a loop in the constructor so when it was getting called it had not yet been set to listen to.
So i moved the loop to its own Start() and it now works as below:
SegmentOne = new Segment(SegmentOneStart, SegmentOneEnd, this._webRequest);<br />
SegmentOne.ProgressUpdate += new Segment.SegmentProgressUpdate(SegmentOne_ProgressUpdate);<br />
SegmentOne.Start();
Thanks guys
|
|
|
|
|
Well, like the topic asks, is it possible to make a program in C#/VB.NET that can hide the mouse cursor in another program? (Like a mediaplayers videowindow)
Tried this:
[DllImport("user32.dll")] private static extern long ShowCursor(long bShow);
But you cant specify hwnd/handle, so it only works for the current window that belongs to my app.
So what im asking is:
Is it possible to hide the mouse cursor when its inside a window that belongs to another program?
|
|
|
|
|
Why not embedded the application inside yours and then use that to hide the cursor which you can do from .net.
|
|
|
|