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Seishin# wrote:
objTwo.objOne.someEvent+=new EventHandler(someOtherDelegate);
cant U check like:
if(objTwo.objOne.someEvent==null)
objTwo.objOne.someEvent+=new EventHandler(someOtherDelegate);
This will allows only first assignment.
Seishin# wrote: i "resolved" the problem by trying -= the delegate form event before i += it..
Though this statement will make the delegate invoke only one function,
U R remiving and assigning the function each time.
Or can't u simply assign with "=" sign instead of +=, so that it will
overwrite any existing one.
Regards,
Arun Kumar.A
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Arun.Immanuel wrote: cant U check like:
if(objTwo.objOne.someEvent==null)
objTwo.objOne.someEvent+=new EventHandler(someOtherDelegate);
nope.. as i wrote you can check event for null only in the class where you declare it.. in this case it would by objOne.. in objThree I can only += or -= delegates..
Arun.Immanuel wrote: Though this statement will make the delegate invoke only one function,
U R remiving and assigning the function each time.
yup.. and thus it'll prevent adding more than one instance of my wished delegate from objThree to someEvent.. if i didn't try to -= the delegate another instance of it would be added later and in effect in stead of caling the delegate once i'd do it as many times as i added it..
Arun.Immanuel wrote: Or can't u simply assign with "=" sign instead of +=, so that it will
overwrite any existing one.
putting aside the fact that you cant do something like that, I'm assigning delegates to this event in other classes too so i can't do something like that..
btw. you shouldn't use the U in stead od 'you' etc. on this kind of forums (this kind of writing has its name but can't remember it  )
life is study!!!
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Seishin# wrote: btw. you shouldn't use the U in stead od 'you' etc. on this kind of forums (this kind of writing has its name but can't remember it )
Thank you very much.
Regards,
Arun Kumar.A
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Hello every body
when i want to connect to a PC which have a real IP
we use
TcpClient myclient = new TcpClient(ip,port);
what if we want to connect to a pc which using a DSL connection ?
please help
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get his ip address
Smile: A curve that can set a lot of things straight!
(\ /)
(O.o)
(><)
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so , how to get his real ip
if he uses DSL Connection his ip will be as an example (10.0.0.3)
& this certainly cann't be acessed ,,,
we need the real ip
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The "real IP" is the one visible to the internet. You can't get his private IP on his local network. There's, usually, no direct route for IP packets to go to get to a private IP address. His router has to be setup to allow, and redirect to his machine, the connection request from your machine on the Internet.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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I ve to upload a database (.mdb) file over Web form.
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Excuse me,my English is poor.
When I used Webbrowser to browse some page.
Sometimes it would pop up MessageBox which I need to click the OK.
How to automatically detect the appearence of MessageBox and let it disapper.
or is there have any other way?
thaks
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i want to insert unicode character(arabic) from c# to sql server 2005. but sql server is not supporting  the unicode .
sadia
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Just a helpful hint.
Delete the post below and next time you can just
modify your post to fix the 'subject'.
God Bless,
Jason
DavidCrow wrote: It would not affect me or my family one iota. My wife and I are in charge of when the tv is on, and what it displays.
I do not need any external input for that.
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i want to insert unicode character(arabic) from c# to sql server 2005. but sql server is not supporting the unicode .
sadia
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rehab1 wrote: but sql server is not supporting the unicode
I used to store Arabic data in SQL server for years.
do you use nvarchar and ntext fields? or varchar and text?
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hi,
what would be the probable cause why i received this kind of error message...
this is my code:
try
{
foreach(DataGridViewRow row in dataGridView4.Rows)
{
long itemcode = 0;
string description = "";
int quantity = 0;
string unit = "";
itemcode = Convert.ToInt64(row.Cells[0].Value);
description = row.Cells[1].Value.ToString();
quantity = Convert.ToInt32(row.Cells[2].Value);
unit = row.Cells[3].Value.ToString();
String query = "INSERT INTO test(itemcode,description,quantity,unit) VALUES (itemcode,description,quantity,unit)";
MySqlCommand command = new MySqlCommand(query, connection);
command.ExecuteNonQuery();
}
}
catch (MySqlException mse)
{
MessageBox.Show(mse.Message);
}
}
jing
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Where is the debugger popping the error out.
What line?
God Bless,
Jason
DavidCrow wrote: It would not affect me or my family one iota. My wife and I are in charge of when the tv is on, and what it displays.
I do not need any external input for that.
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hi,
thanks for the reply...
the following lines:
description = row.Cells[1].Value.ToString();
unit = row.Cells[3].Value.ToString();
these two lines of code are string, i wonder why it has an error.
pls. help
thanks,
jing
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Like PIEBALDconsult said below,
You need to use the debugger to find out what line.
God Bless,
Jason
DavidCrow wrote: It would not affect me or my family one iota. My wife and I are in charge of when the tv is on, and what it displays.
I do not need any external input for that.
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hi,
ok thanks a lot...
God Bless
jing
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Some value is null. Try debugging to see what line throws the exception. If you still can't figure it out, then post more information.
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hi,
thanks for the reply..
the following 2 lines received the error message..
description = row.Cells[1].Value.ToString();
unit = row.Cells[3].Value.ToString();
regard
jing
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Then either row, row.Cells, row.Cells[1], or row.Cells[1].Value is null. The debugger will show the value of each of them so it should be easy to find.
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hi,
thanks..
yap,through the debugger,i've found out that row.Cell[1].Value is null.i'm trying to fix it right now...
jing
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hi,
by the way will you please help me on how to insert values from the datagridview to the database table?
waiting for your reply
jing
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In your
String query = "INSERT INTO test(itemcode,description,quantity,unit) VALUES (itemcode,description,quantity,unit)";
You'll want to use parameters for itemcode,description,quantity,unit
I'm not as familiar with MySql, but in Sql Server I'd prefix each with an @
@itemcode,@description,@quantity,@unit
Then instantiate a MySqlParameter for each and add them to the command's parameter collection.
Roughly: command.Parameters.Add ( new MySqlParameter ( "@itemcode" , itemcode ) ;
But if you're going to be inserting a bunch of data in a loop, you'll want something like: command.Parameters.Add ( new MySqlParameter ( "@itemcode" , typeof(itemcode) ) ;
then in the loop: command.Parameters [ "@itemcode" ].Value = itemcode ; (will that work?)
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