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You can alternatively override onClose but this causes problems when windows try's to close down if your app is still open.
Kev
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You can catch the Closing event of the form. Youll get CancelEventArgs in the handler and can set Cancel to true.
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If you are using Visual Studio .NET :
1. Select the form, you want your close button to un-show
2. On the property list...select ControlBox
3. Set it False
However, doing this, would also disappear the minimise and maximise buttons.
I suggest you to override the OnClose Event, yet it gives some trouble!
GaMBiT---> aND ReVeNGe WiLL Be
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In MFC, Draw a Round rectangle,can use CDC::RoundRect() method,In C#, I how to do it? Give me a sample?
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You will have to use a GraphicsPath object.
Rectangle r;
int angle = 180;
int radius = 5;
GraphicsPath gp = new GraphicsPath();
gp.AddArc(r.X, r.Y - radius, radius, radius, angle, 90);
angle += 90;
gp.AddArc(r.Right - radius, r.Y - radius,radius, radius, angle, 90);
angle += 90;
gp.AddArc(r.Right - radius, r.Bottom - radius, radius, radius, angle, 90);
angle += 90;
gp.AddArc(r.X, r.Bottom - radius, radius, radius, angle, 90);
angle += 90;
gp.CloseAllFigures();
xacc-ide 0.0.12 now with C#, MSIL, C, XML, ASP.NET and HLSL coloring - Screenshots
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hi,
I'm writing a program in C# that monitors and controls user's access to the computer , logs in keyboard keystrokes and takes a snapshot of the user's desktop. Now I'm trying to write the code to modify the registry to allow my program to load with the operating system and run the instance a spicific user logs into the system. I'm really in great need for help since I'm not sure what functions and classes to use to achieve this goal. I'm writing this program as a graduation project and the deadline is getting near so any help will be very greatly appreciated.
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use the Microsoft.Win32 namespace, it has a Registry class which has some static methods for accesing the local registry and some other classes you can use to create your own registry keys.
Kev
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Hi,
I am currently writing an application in pocket pc 2003. The application
need to get those emails related to the application(e.g. email from a specified contact) from the
default email client in pocketpc and store them in the application. But I face a design consideration
problem,
1. Are most users use the default email client in pocket pc when they
receive email wirelessly ? If not, my application need to connect to the other third-party email client
also, but how I program the application to connect to diverse set of pocket pc email clients available
on the market ? Are there a common standard for doing this ?
2. My application need to send email from the pocket pc, the current
method is to send the email message to the default email client in the pocket pc, and the user click the
send/receive button on the default client later. But this seem not quite user-friendly to the users.
Original, I intend to write code so that the application directly send email to the smtp server, but the
coding seem quite complex and need to handle many cases for the smtp server protocol handshaking. So are
there any better methods ?
Thanks
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how do i create a collection of collections?
Heres what I mean:
SectionCollection
TemplateCollection
PageCollection
Contents
Where each ofthe collections has a subcollection (like the datatable->rows->column)
SectionCollection[x].TemplateCollection[x].PageCollection[x].Contents[x].whatevercontent
My sectioncollection is inheriting System.Collections.CollectionBase. The SectionCollection also parses data that it is passed into SelectionItem.
My question is how can i extend this to make it similar to the datatable->rows->column relationship?
-Steven Hicks
CPACodeProjectAddict
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Hi all,
I had a basic problem, I think it is a very small one. I had a problem with the Date function. I am encountering an error
"The type or namespace name 'date' could not be found (are you missing a using directive or an assembly reference?)"
I am unable to locate, which namespace the "date" function belongs to.Can anyone guide me on this?
Regards,
Sowmya Mulukutla,
UAB
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Do u mean the DateTime class?
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yes and also what does DayOfWeek mean, do we have to set it to one of the 7 values?
Regards,
Sowmya Mulukutla,
UAB
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Hi all,
I am currently evaluating SSL components from IPWorks to
implement https protocol for client-server communication.
But it is a bit expensive, do anyone have any experience on using it
or are there any other cheaper component for SSL communication ?
Thanks
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Ok i don't know how unknown this method is...or if i'm the last one to find out how...but i did it!
the secret lies in this:
[
XmlInclude(typeof(ClassToSerialize)),
XmlInclude(typeof(AnotherClass))
]
public class SerializableArrayList : ArrayList
{}
it was apparent from the errormessages that the serializer was struggling to determine the types of the objects it was trying to serialize...so if i use this class as my arraylist, and do the xmlinclude on any type my arraylist will hold, then i could serialize it. (i don't think it'd be possible to do this if you don't know the types...without making your own xml serializer)
This is what the serialized xml looks like. Notice the "AnotherClass"...this is the contents of an arraylist! and both serialization and deserialization works. Only thing i wish i could do is get rid of that anyType thing thats all over the place...if anyone knows how let me know...if anyone wants more code let me know...if you think this is good enough to be a article let me know :P
note: i had to double up on the xml braces, cause codeproject considers them page formating
<>
<<arrayofanytype xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">>
<<anytype xsi:type="ClassToSerialize">>
<<age>>3<>
<<name>>hi<>
<>
<<anytype xsi:type="ClassToSerialize">>
<<age>>4<>
<<name>>hi<>
<>
<<anytype xsi:type="ClassToSerialize">>
<<age>>5<>
<<name>>hi<>
<>
<<anytype xsi:type="AnotherClass">>
<<age>>666<>
<>
<<anytype xsi:type="ClassToSerialize">>
<<age>>6<>
<<name>>hi<>
<>
<>
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Hi all,
Is it possible to write a SQL to join two tables from two different
databases ? Is this a common operation for business applications ?
If not, then is it not a good practice to split the stuff into different databases ? My case is like that : I have a central database to record
the meta information of all objects from different applications, and also
have a seperate database for each single application to store the detail of the objects. But when I search for objects according to some criteria,
then I need to have join SQL over two different databases(the central database and the application detail database).
Thanks
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This is really a topic for the database forum.
When you repost this question there, you may want to provide some more detail about what you're doing, e.g.:
1. What kind of database are you using (SQL Server, MS Acess, MySQL, or ??)?
2. What you mean by "separate database" - do you mean an actual separate physical database instance, or just separate tables in the same schema?
Short answer: Yes, it is possible to join tables from 2 or more distinct database instances. The syntax varies from platform to platform. Without knowing why your data is arrayed as it is, I can't say whether your arrangement is an example of "good practice", although in my experience joining databases is rare.
Hope this helps.
The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’
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Hi turbochimp,
Thanks for your reply.
The database I used is MS SQL CE on pocket pc device. And the two databases are on seperate physical database instances on the same device.
Could you point me to some reference for the syntax on MSSQL server or MSSQL CE(i think they are more or less the same) ?
My case is that I have several applications(each application has its own database instance) runnig together and they shared some common schema in a central database, so I need to join the central database and the application database for retrieving.
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In Windows Forms the ListBox class has a GetItemText method, but lacks a GetItemValue method. How to retrieve the associated value of any specified item? There is a SelectedValue property. That does not work for me because I need to get the value for any item without changing the selection of the listbox.
Actually I was using the checkedListBox class. At a certain point in the program I want to get the associated values for the items the user put a check mark on.
Thanks for your help
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if I have event jump and I have blobs that link to it can I use the event to get links to the blobs how, and yes I think the event holds the refs some how.
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See this code:
string msg = "My name is ABC, hello there";
MessageBox.Show(msg);
Now I would like to add a parammeter to msg so that I can change the name, for example
string msg = "My name is {0}, hello there";
I don't like the following way for some reasons:
string msg1 = "My name is ";
string msg2 = ", hello there";
string name = "ABC";
then
MessageBox.Show(msg1 + name + msg2);
But I don't know how to do it.
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String name = "ABC";
String msg = String.Format("My name is {0}, hello there",name);
msgBox.Show(msg);
Anger is the most impotent of passions. It effects nothing it goes about, and hurts the one who is possessed by it more than the one against whom it is directed.
Carl Sandburg
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Hi,
I am installing some softwares to Windows 2003. Those softwares, after being installed, will add some COM+ components to COM+ Application under Component Services. Now I just want to write a piece of code to read the names of COM+ components that have just been added.
Can u guys give me some hints?
Thanks
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Hai,
Below is the code i saw @
http://support.microsoft.com/default.aspx?scid=kb;en-us;301240.
Pl go tho' the ex & ans my qns
every thing is fine but sql connection path iam having doubt. actually iam using sql server 2000. in pubs database i have run the below given code.
conn = new SqlConnection( "server=localhost;Integrated Security=SSPI;database=pubs" );
my qn is wht should my connection path should be. directly windows based login iam using for sql server.
Think u got my qns . pl ans
chand
Create an ASP.NET Application Using C# .NET
1. Open Visual Studio .NET.
2. Create a new ASP.NET Web application, and specify the name and location.
back to the top
Configure the Security Settings in the Web.config File
This section demonstrates how to add and modify the <authentication> and <authorization> configuration sections to configure the ASP.NET application to use forms-based authentication. 1. In Solution Explorer, open the Web.config file.
2. Change the authentication mode to Forms.
3. Insert the <forms> tag, and fill the appropriate attributes. (For more information about these attributes, refer to the MSDN documentation or the QuickStart documentation that is listed in the REFERENCES section.) Copy the following code, and then click Paste as HTML on the Edit menu to paste the code in the <authentication> section of the file:
<authentication mode="Forms">
<forms name=".ASPXFORMSDEMO" loginurl="logon.aspx"
="" protection="All" path="/" timeout="30">
4. Deny access to the anonymous user in the <authorization> section as follows:
<authorization>
<deny users="?">
<allow users="*">
back to the top
Create a Sample Database Table to Store Users Details
This section demonstrates how to create a sample database to store the user name, password, and role for the users. You need the role column if you want to store user roles in the database and implement role-based security. 1. On the Start menu, click Run, and then type notepad to open Notepad.
2. Highlight the following SQL script code, right-click the code, and then click Copy. In Notepad, click Paste on the Edit menu to paste the following code:
if exists (select * from sysobjects where id =
object_id(N'[dbo].[Users]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Users]
GO
CREATE TABLE [dbo].[Users] (
[uname] [varchar] (15) NOT NULL ,
[Pwd] [varchar] (25) NOT NULL ,
[userRole] [varchar] (25) NOT NULL ,
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Users] WITH NOCHECK ADD
CONSTRAINT [PK_Users] PRIMARY KEY NONCLUSTERED
(
[uname]
) ON [PRIMARY]
GO
INSERT INTO Users values('user1','user1','Manager')
INSERT INTO Users values('user2','user2','Admin')
INSERT INTO Users values('user3','user3','User')
GO
3. Save the file as Users.sql.
4. On the Microsoft SQL Server computer, open Users.sql in Query Analyzer. From the list of databases, click pubs, and run the script. This creates a sample users table and populates the table in the Pubs database to be used with this sample application.
back to the top
Create a Logon.aspx Page
1. Add a new Web Form to the project named Logon.aspx.
2. Open the Logon.aspx page in the editor, and switch to HTML view.
3. Copy the following code, and use the Paste as HTML option on the Edit menu to insert the code between the tags:
Logon Page
| Email: | | <asp:requiredfieldvalidator controltovalidate="txtUserName"
="" display="Static" errormessage="*" runat="server" id="vUserName"> | | Password: | | <asp:requiredfieldvalidator controltovalidate="txtUserPass"
="" display="Static" errormessage="*" runat="server" id="vUserPass">
| | Persistent Cookie: | <asp:checkbox id="chkPersistCookie" runat="server" autopostback="false"> | |
<asp:label id="lblMsg" forecolor="red" font-name="Verdana" font-size="10" runat="server">
This Web Form is used to present a logon form to users so that they can provide their user name and password to log on to the application.
4. Switch to Design view, and save the page.
back to the top
Code the Event Handler So That It Validates the User Credentials
This section presents the code that is placed in the code-behind page (Logon.aspx.cs). 1. Double-click Logon to open the Logon.aspx.cs file.
2. Import the required namespaces in the code-behind file:
using System.Data.SqlClient;
using System.Web.Security;
3. Create a ValidateUser function to validate the user credentials by looking in the database. (Make sure that you change the Connection string to point to your database).
private bool ValidateUser( string userName, string passWord )
{
SqlConnection conn;
SqlCommand cmd;
string lookupPassword = null;
// Check for invalid userName.
// userName must not be null and must be between 1 and 15 characters.
if ( ( null == userName ) || ( 0 == userName.Length ) || ( userName.Length > 15 ) )
{
System.Diagnostics.Trace.WriteLine( "[ValidateUser] Input validation of userName failed." );
return false;
}
// Check for invalid passWord.
// passWord must not be null and must be between 1 and 25 characters.
if ( ( null == passWord ) || ( 0 == passWord.Length ) || ( passWord.Length > 25 ) )
{
System.Diagnostics.Trace.WriteLine( "[ValidateUser] Input validation of passWord failed." );
return false;
}
try
{
// Consult with your SQL Server administrator for an appropriate connection
// string to use to connect to your local SQL Server.
conn = new SqlConnection( "server=localhost;Integrated Security=SSPI;database=pubs" );
conn.Open();
// Create SqlCommand to select pwd field from users table given supplied userName.
cmd = new SqlCommand( "Select pwd from users where uname=@userName", conn );
cmd.Parameters.Add( "@userName", SqlDbType.VarChar, 25 );
cmd.Parameters["@userName"].Value = userName;
// Execute command and fetch pwd field into lookupPassword string.
lookupPassword = (string) cmd.ExecuteScalar();
// Cleanup command and connection objects.
cmd.Dispose();
conn.Dispose();
}
catch ( Exception ex )
{
// Add error handling here for debugging.
// This error message should not be sent back to the caller.
System.Diagnostics.Trace.WriteLine( "[ValidateUser] Exception " + ex.Message );
}
// If no password found, return false.
if ( null == lookupPassword )
{
// You could write failed login attempts here to event log for additional security.
return false;
}
// Compare lookupPassword and input passWord, using a case-sensitive comparison.
return ( 0 == string.Compare( lookupPassword, passWord, false ) );
}
4. You can use one of two methods to generate the forms authentication cookie and redirect the user to an appropriate page in the cmdLogin_ServerClick event. Sample code is provided for both scenarios. Use either of them according to your requirement. • Call the RedirectFromLoginPage method to automatically generate the forms authentication cookie and redirect the user to an appropriate page in the cmdLogin_ServerClick event:
private void cmdLogin_ServerClick(object sender, System.EventArgs e)
{
if (ValidateUser(txtUserName.Value,txtUserPass.Value) )
FormsAuthentication.RedirectFromLoginPage(txtUserName.Value,
chkPersistCookie.Checked);
else
Response.Redirect("logon.aspx", true);
}
• Generate the authentication ticket, encrypt it, create a cookie, add it to the response, and redirect the user. This gives you more control in how you create the cookie. You can also include custom data along with the FormsAuthenticationTicket in this case.
private void cmdLogin_ServerClick(object sender, System.EventArgs e)
{
if (ValidateUser(txtUserName.Value,txtUserPass.Value) )
{
FormsAuthenticationTicket tkt;
string cookiestr;
HttpCookie ck;
tkt = new FormsAuthenticationTicket(1, txtUserName.Value, DateTime.Now,
DateTime.Now.AddMinutes(30), chkPersistCookie.Checked, "your custom data");
cookiestr = FormsAuthentication.Encrypt(tkt);
ck = new HttpCookie(FormsAuthentication.FormsCookieName, cookiestr);
if (chkPersistCookie.Checked)
ck.Expires=tkt.Expiration;
ck.Path = FormsAuthentication.FormsCookiePath;
Response.Cookies.Add(ck);
string strRedirect;
strRedirect = Request["ReturnUrl"];
if (strRedirect==null)
strRedirect = "default.aspx";
Response.Redirect(strRedirect, true);
}
else
Response.Redirect("logon.aspx", true);
}
5. Make sure that the following code is added to the InitializeComponent method in the code that the Web Form Designer generates:
this.cmdLogin.ServerClick += new System.EventHandler(this.cmdLogin_ServerClick);
back to the top
Create a Default.aspx Page
This section creates a test page to which users are redirected after they authenticate. If users browse to this page without first logging on to the application, they are redirected to the logon page. 1. Rename the existing WebForm1.aspx page as Default.aspx, and open it in the editor.
2. Switch to HTML view, and copy the following code between the tags:
This button is used to log off the forms authentication session.
3. Switch to Design view, and save the page.
4. Import the required namespaces in the code-behind file:
using System.Web.Security;
5. Double-click SignOut to open the code-behind page (Default.aspx.cs), and copy the following code in the cmdSignOut_ServerClick event handler:
private void cmdSignOut_ServerClick(object sender, System.EventArgs e)
{
FormsAuthentication.SignOut();
Response.Redirect("logon.aspx", true);
}
6. Make sure that the following code is added to the InitializeComponent method in the code that the Web Form Designer generates:
this.cmdSignOut.ServerClick += new System.EventHandler(this.cmdSignOut_ServerClick);
7. Save and compile the project. You can now use the application.
back to the top
Additional Notes
• You may want to store passwords securely in a database. You can use the FormsAuthentication class utility function named HashPasswordForStoringInConfigFile to encrypt the passwords before you store them in the database or configuration file.
• You may want to store the SQL connection information in the configuration file (Web.config) so that you can easily modify it if necessary.
• You may consider adding code to prevent hackers who try to use different combinations of passwords from logging on. For example, you can include logic that accepts only two or three logon attempts. If the user cannot log on in a certain number of attempts, you may want to set a flag in the database to not allow that user to log on until that user re-enables his or her account by visiting a different page or by calling your support line. In addition, you should add appropriate error handling wherever necessary.
• Because the user is identified based on the authentication cookie, you may want to use Secure Sockets Layer (SSL) on this application so that no one can deceive the authentication cookie and any other valuable information that is being transmitted.
• Forms-based authentication requires that your client accept or enable cookies on their browser.
• The timeout parameter of the <authentication> configuration section controls the interval at which the authentication cookie is regenerated. You can choose a value that provides better performance and security.
• Certain intermediary proxies and caches on the Internet may cache Web server responses that contain Set-Cookie headers, which are then returned to a different user. Because forms-based authentication uses a cookie to authenticate users, this can cause users to accidentally (or intentionally) impersonate another user by receiving a cookie from an intermediary proxy or cache that was not originally intended for them. The following article explains how to combat
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