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Your problem is probably caused by not doing all of your drawing in the Panel's Paint event. Do NOT create your own graphics object. Use the one that Windows hands you in the event args of the Paint event.
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thanks Dave, I try to not create a graphics obj ...
Alex
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Drawing a grid on a panel? I just did that a little while ago. Here's a sample that makes a 20-px grid.
private Pen pen = new Pen(Color.FromArgb(60, 60, 60), 1);
private void something_Paint(object sender, PaintEventArgs e)
{
for (int x = 20; x < Width; x += 20) e.Graphics.DrawLine(pen, x, 0, x, Height);
for (int y = 20; y < Height; y += 20) e.Graphics.DrawLine(pen, 0, y, Width, y);
}
[Edit]: Moved Pen object out of method.
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You forgot to Dispose the Pen. Nothing like an example that leaks GDI resources!
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Or even better, don't re-create it on every Paint in the first place. Moved it out of the method. 
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thanks to all ..
Alex
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Hello, My question involve both code and algorithm so I'm hoping I'm in the right place:
I have a win form application with c# and fw4.
I have a panel (name P1) and I'm adding buttons dynamically to him in run time based on a file list I read from a directory (for each file I read I'm creating a button with the file name as text and add him to the panel controls).
I have another panel (P2) with same process from another list.
Now - I want to navigate between the buttons in P1 when I'm pressing the left/right keys and between the the buttons in P2 when I'm pressing the up/down buttons.
I have a lots of ideas to do that (save a list of buttons in each panel and a variable to remember on which button I am, maybe using a hash table ).
I know how to do the programing stuff (creating every thing, getting the key press and so on) I just can't think of a normal algorithm for that. all my ideas seems lame 
Hope I'm in the right place and thanks in advance.
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OK. Lets have a generic list of some type (Button to start with) for the first panel, and similar for the second. Then hold an integer index variable into the list. Next, have the form preview your keyboard input, check for an arrow key, and modify the appropriate index variable (make sure to check for boundary values, so you don't exceed the range of the list).
The items in your list could better be instances of a little class, that holds the Button itself, the file name, and whatever else you may want it to hold.
And finally, you could make a custom Panel-derived class that does the above (scanning a folder, creating your objects, showing the buttons, holding the list, etc.), as you basically need the same thing twice.
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Hi Luc,
Thanks for the reply. I think I'll skip the custom panel for now
I thought about list of only names at first and then find the button with Panel.Controls["name"] but now I think maybe to do a list of buttons and then I can click may button only bay index in the list with out the need to find the button in the panel every time.
Thanks for the ideas.
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hi all
i have a web service.a function get 2 parameters and return a string.
public string zakhire(string s,string d)
{
string sql = " insert into FX_Forecast2 (Symbol,DateTime) values( '"+s+"',"+d+")";
OpenDb();
cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
con.Close();
return sql;
}
i want after executing function these 2 parameters with function name be in url,but just function name passes in url,not parameters and their values!!!
can someone say how to pass parameters??
do i should write code else to do this?
thnx
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Firstly I would suggest do not build your query like this:
string sql = " insert into FX_Forecast2 (Symbol,DateTime) values( '"+s+"',"+d+")";
You leave yourself open to SQL Injection Attacks[^] Use a paramterised query[^] instead.
Secondly, you are not checking that d is a date: this is a recipie for disaster or, at least insert failure exceptions, which are costly in terms of performance.
Points 1 & 2 are especially true if the values are coming from outside you application, such as the WebServce you state.
Finaly, if the strings s and d are correct, your SQL will be generated correctly as far as I can tell, so the problem is probably with the code calling this method. Have you checked that values of s and d?
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Sage Advice and a Good Answer!
------------------------------------
I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
CCC League Table Link
CCC Link[ ^]
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about point 1: your advise is correct.
about point 2:arrival parameters evaluate in another software that send these to this web service.so they are correct.
this url has shown when execute method:
http:
but i want to pass parameters and values in url after method name.
what's the problem that don't show parameters in url?
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roebuck-code wrote: about point 2:arrival parameters evaluate in another software that send these to this web service.so they are correct.
Not necessarily: their code could be buggy, the web-service client they are using might be poorly formed or of a different version. You need to check the values coming in. You shouldn't trust anything coming into your webservice, even if you provide it.
IIRC, the values from the querystring don't get passed into the asmx method by default, they normally come from the SOAP message. As for getting stuff from the query string you'd have to do something like the following:
string value = Request.QueryString.Get("name").ToString();
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Keith has already pointed out to you why your approach isn't considered to be within the best practices.
My philosophy in any project I'm involved with is that at any level, always assume the consumer of a method/service doesn't know what they are doing. How do you protect yourself.
I wasn't, now I am, then I won't be anymore.
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roebuck-code wrote: be in url
What URL?
As Keith has pointed out you should never accept unvalidated input to your Sql statements. Use stored procedures or at least a parameterized query.
If you want to return the command text that was executed, though I can't see why you would, then use SqlCommand.CommandText
I know the language. I've read a book. - _Madmatt
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Mark Nischalke wrote: What URL?
after executing this method,open a page that show me this answer:
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="http://tempuri.org/">insert into FX_Forecast2 (Symbol,DateTime) values( '4',56/8/8)</string>
in page's url has been written method name.
i want after it be parameters and values.
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Manfred R. Bihy wrote: This will work if the parameter names of the function match those of the exposed web service method.
The parameters are appended like any other URL parameters by separating them with a "?"
should i pass parameters in url with coding or these have been passed after executing method?
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roebuck-code wrote: should i pass parameters in url with coding
Yes, you should pass the parameteters in URL and they have to be encoded according to the rules of URL encoding.
roebuck-code wrote: or these have been passed after executing method
You'll have to do some explaining of what that means, as my feeble mind was unable to grasp what you were trying to say.
Cheers!
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Manfred R. Bihy wrote: Yes, you should pass the parameteters in URL and they have to be encoded according to the rules of URL encoding.
what code i should write for passing parameters in url?
Manfred R. Bihy wrote: roebuck-code wrote:
or these have been passed after executing method
You'll have to do some explaining of what that means, as my feeble mind was unable to grasp what you were trying to say.
i thought that parameteres pass in url without my coding.
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Please elaborate on from where you intend to call the webservice method. Write a minimal HTML document that illustrates the basic idea. Like posting the data from a form or calling the url from AJAX. The way this question started out there just isn't enough information to give you any appropriate help.
Regards,
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i have a page in a web service:'default.asmx'
in default.cs(in App_Code) is a web method:
[WebMethod]
public string zakhire(string s,string d)
{
string sql = " insert into FX_Forecast2 (Symbol,A) values( '"+s+"','"+d+"')";
OpenDb();
cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
con.Close();
return sql;
}
type of fields 'Symbol,A' are nvarchar..
now without knowing about a software that send data to webservice,i run this page in visual studio that test this page.
after running this page and executing the method with my arrival data and press 'invoke' button,a page open and in it's url just is method name:
http:
but i need to parameters and values too.like this:
http:
i had seen in a book that has been written in vb language in visual studio that after executing the method and opening a page,arrival parameters and values been in url with method name.
i hope that explain my need clearly.
totally i have a script in mql language in another software that run this url:
http:
i want to insert this parameters('s' and 'd')in database.
so i build a webservice and wrote in .asmx page that code.
do i think right?
modified on Saturday, January 8, 2011 7:46 AM
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I found the answer:
with Going to web.config and adding this code in system.web section:
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>
good luck.
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Try to read string from the registry - i get beck null all the time
Code:
public static string ReadStringFromRegistry( string hive, string key )
{
string strRetVal = null;
try
{
using( RegistryKey regKey = Registry.LocalMachine.OpenSubKey( hive ) )
{
if( null != regKey )
{
strRetVal = regKey.GetValue( key ) as string;
if( String.IsNullOrEmpty( strRetVal ) )
{
strRetVal = null;
Debug.Assert( false, "fail to read from the registry" );
}
}
}
}
catch( Exception e )
{
}
return strRetVal;
}
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