ASP.NET

Re: how to connect database to asp.net form

7-Jul-17 5:51

If you want someone to help you resolve an error, then first you need to tell us what the error is. Just saying "it's not responding" and "something is going wrong" is not enough information for anyone to help you.

The only obvious problem is that you're using AttachDBFilename, but you don't appear to be connecting to an instance of SQL Server Express. That option only works with Express, and is a bad idea anyway:

Bad habits : Using AttachDBFileName - SQL Sentry[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Member 127613417-Jul-17 18:58

Member 12761341

7-Jul-17 18:58

Brother this is error showing in this way "Line no. 22 con.open();

Server Error in '/' Application.

Database 'C:\Program Files (x86)\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\LoginDB1.mdf' already exists. Choose a different database name.
Cannot attach the file 'C:\Users\Atta\Documents\Visual Studio 2012\WebSites\WebSite3\App_Data\aspnet-WebSite3-20170707151050.mdf' as database 'LoginDB1'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.SqlClient.SqlException: Database 'C:\Program Files (x86)\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\LoginDB1.mdf' already exists. Choose a different database name.
Cannot attach the file 'C:\Users\Atta\Documents\Visual Studio 2012\WebSites\WebSite3\App_Data\aspnet-WebSite3-20170707151050.mdf' as database 'LoginDB1'.

Source Error: 


Line 20:     {
Line 21:         SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connect"].ToString());
Line 22:         con.Open();
Line 23:         string query = "select count(*) from userlogin where username ='" + txtBox1.Text + "'and pass '" + txtBox2.Text + "'";
Line 24:         SqlCommand cmd = new SqlCommand(query, con);

Source File: c:\Users\Atta\Documents\Visual Studio 2012\WebSites\WebSite3\Default2.aspx.cs    Line: 22 

Stack Trace: 


[SqlException (0x80131904): Database 'C:\Program Files (x86)\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\LoginDB1.mdf' already exists. Choose a different database name.
Cannot attach the file 'C:\Users\Atta\Documents\Visual Studio 2012\WebSites\WebSite3\App_Data\aspnet-WebSite3-20170707151050.mdf' as database 'LoginDB1'.]
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling) +821
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +332
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +38
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +699
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +89
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +426
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +191
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +154
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +21
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +90
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +217
   System.Data.SqlClient.SqlConnection.Open() +96
   Default2.Button1_Click(Object sender, EventArgs e) in c:\Users\Atta\Documents\Visual Studio 2012\WebSites\WebSite3\Default2.aspx.cs:22
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9819334
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

Re: how to connect database to asp.net form

Richard Deeming10-Jul-17 2:36

XML based News page in ASP.NET MVC

10-Jul-17 2:36

Member 12761341 wrote:
Database 'C:\Program Files (x86)\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\LoginDB1.mdf' already exists. Choose a different database name.

Seems fairy self-explanatory to me. You're trying to attach a database with the same name as an existing database. You need to choose a different name, or stop using attached databases and create a real database instead.

Member 12761341 wrote:
string query = "select count(*) from userlogin where username ='" + txtBox1.Text + "'and pass '" + txtBox2.Text + "'";

Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

Also, NEVER store passwords in plain text.

Secure Password Authentication Explained Simply[^]
Salted Password Hashing - Doing it Right[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Alberto Bencivenni7-Jul-17 2:18

Alberto Bencivenni

7-Jul-17 2:18

How do I build an XML based News page in ASP.NET MVC? I would like to enumerate XML files inside a folder and build a list of summaries on the page. Once the visitor clicks on one of the summaries, I would like to load the associated XML file and render the full news content (with nice formatting included).

An example of the summaries page can be found [1] while and example of the single XML news page rendered can be found here [2]?
Should I write everything from scratch or there is a good tutorial to start with somewhere?

Thanks.

[1]:https://www.devexpress.com/Home/Announces/2017-Universal-17-1.xml
[2]:https://www.devexpress.com/Home/Announces/

Re: XML based News page in ASP.NET MVC

Richard Deeming7-Jul-17 2:59

Re: XML based News page in ASP.NET MVC

7-Jul-17 2:59

It depends on the structure of the XML files. Do they all share the same structure? If not, how do you identify which structure each file has?

If they're RSS or Atom feeds, the SyndicationFeed[^] class is probably the best place to start:
Build an RSS reader in 5 minutes | Thomas Levesque's .NET blog[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Alberto Bencivenni7-Jul-17 3:04

Alberto Bencivenni

7-Jul-17 3:04

XML file will be manually created by us and they should support formatting in some way. As you can see from the links, this News are nicely formatted (I mean titles, sub-titles, etc.)

Thanks.

Reflect changes by not having to clear cookies or refresh pages on production after upgrade

Schatak5-Jul-17 22:45

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

5-Jul-17 22:45

We are getting complaints from the customer that they have to keep on refresh (Ctrl+F5) on the page or sometimes clear the cookies to reflect the changes done on upgrade.
Especially, when we upload CSS/JS files or Images sometimes.

To overcome this situation, I did some research and found one solution to append Query string with the name of image or CSS files. But it does not seem to be a coherent solution. Then I used NuGet packages for Bundle. It seems to be the solution but I have another issue like I am calling individual CSS file for each page (page specific) and to make a bundle for the single file is not the good idea.

What should i follow as good approach to overcome this situation where changes can reflect on the server after uploading CSS/Images or JS files.

F-ES Sitecore6-Jul-17 0:26

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

6-Jul-17 0:26

You've already mentioned it, a querystring variable on the css\js paths.

Schatak7-Jul-17 1:31

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

7-Jul-17 1:31

Should I go with this option only?

F-ES Sitecore7-Jul-17 2:40

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

7-Jul-17 2:40

Most people do.

Schatak11-Jul-17 19:05

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

11-Jul-17 19:05

Okay, I will opt the same.
Thanks

Richard Deeming6-Jul-17 1:41

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

6-Jul-17 1:41

Mads Kristensen wrote a blog post explaining how to do this back in 2014: Cache busting in ASP.NET[^]

However, I'd be inclined to use the query-string rather than a fake path. It's a fairly simple change:

using System; 
using System.IO; 
using System.Web; 
using System.Web.Caching; 
using System.Web.Hosting;

public class Fingerprint 
{ 
    public static string Tag(string rootRelativePath) 
    { 
        if (string.IsNullOrWhiteSpace(rootRelativePath)) return string.Empty;
        
        if (rootRelativePath[0] != '~')
        {
            rootRelativePath = "~" + rootRelativePath;
        }
        
        string result = HttpRuntime.Cache[rootRelativePath] as string;
        if (result == null) 
        {
            string absolute = HostingEnvironment.MapPath(rootRelativePath);
            DateTime date = File.GetLastWriteTime(absolute); 
            result = rootRelativePath + "?v=" + date.Ticks;
            HttpRuntime.Cache.Insert(rootRelativePath, result, new CacheDependency(absolute)); 
        }
        
        return result; 
    } 
}

<link rel="stylesheet" href="@Fingerprint.Tag("~/content/file.css")" />

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Schatak24-Jul-17 20:25

Re: Reflect changes by not having to clear cookies or refresh pages on production after upgrade

24-Jul-17 20:25

Wasn't there some other setting that automatically forces updates the CSS?

Richard Deeming25-Jul-17 0:31

Microsoft.AspNet.FriendlyUrls

25-Jul-17 0:31

Only if you disable caching on the files, which will degrade the performance of your site.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Member 110895115-Jul-17 22:37

Member 11089511

5-Jul-17 22:37

This is a nice ASP.NET UrlRouting tool I have ever tried nowadays. I developed an asp.net web form app using this tool. It's great working my local IIS. If I deploy to my web hosting, it's giving an error about SecurityPermission. Please help me!

[SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
   System.Web.Security.UrlAuthorizationModule.CheckUrlAccessForPrincipal(String virtualPath, IPrincipal user, String verb) +42
   Microsoft.AspNet.FriendlyUrls.Abstractions.UrlAuthorizationModuleWrapper.CheckUrlAccessForPrincipal(String virtualPath, IPrincipal user, String verb) +14
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute.GetWebObjectFactory(HttpContextBase httpContext, String modifiedVirtualPath) +159
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute.Resolve(HttpContextBase httpContext, IList`1 extensions, String virtualPathOverride, IFriendlyUrlRouteSupportFunctions supportFunctions) +220
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute.Microsoft.AspNet.FriendlyUrls.Abstractions.IFriendlyUrlRouteSupportFunctions.Resolve(HttpContextBase httpContext, IList`1 extensions, String virtualPathOverride) +16
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute.GetRouteData(HttpContextBase httpContext, String pathOverride, IFriendlyUrlRouteSupportFunctions supportFunctions) +140
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute.GetRouteData(HttpContextBase httpContext, String pathOverride) +9
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlsModule.RedirectToFriendlyUrl(HttpContextBase httpContext, IFriendlyUrlRoute route, IVirtualPathUtility virtualPathUtility) +346
   Microsoft.AspNet.FriendlyUrls.FriendlyUrlsModule.<Init>b__0(Object sender, EventArgs e) +171
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +141
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

Re: Microsoft.AspNet.FriendlyUrls

Richard Deeming6-Jul-17 1:38

How to associate a role with action from my custom UI

6-Jul-17 1:38

Sounds like your web host has configured your application to run in medium trust:
How To: Use Medium Trust in ASP.NET 2.0[^]

This is no longer recommended by Microsoft:
What not to do in ASP.NET, and what to do instead | Medium Trust[^]

Based on the comments to your StackOverflow copy of this question[^], it looks like you've already fixed this by configuring the application to run in full trust.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Mou_kol4-Jul-17 4:04

Mou_kol

4-Jul-17 4:04

often we attach role with action like below way

[Authorize(Roles = "Admin, SuperUser")]

[Authorize(Users="Jacquo, Steve", Roles="Admin, SuperUser")]

Users : Comma-separated list of usernames that are allowed to access the action method.

Roles : Comma-separated list of role names. To Access the action method, users must be in at least one of these roles.

[Authorize(Roles = "Producer")]
[Authorize(Roles = "Admin")]
public ActionResult Details(int id) {
    // Only available to users who are Producers AND Editors
}

now see authorize and role name is hard coded with action method. suppose action Details is associated with admin role which is hard coded but how could i attach more role to details action or remove any role from details action at run time. i guess it is not possible because asp.net mvc not providing anything built in.

i search google to see that anyone does it anything such as what i am looking for. unfortunately found no similar write up.

so i need some guidance that how could i develop a UI from where admin can associate role with action instead of hard coding at development time.

so tell me your think how could i associate a role or multiple roles with action from a custom UI.

also tell me how could i check at run time that user has that role when user try to access a specific action.

please discuss in details for designing this part what i am looking for. still it is not clear to you what i am looking for then tell me i will try to explain the same in more details.

thanks

Re: How to associate a role with action from my custom UI

F-ES Sitecore4-Jul-17 4:17

LDAP Group List for Windows User

4-Jul-17 4:17

I think these can't be dynamic due to the fact that .net only inistialises the attribute the once and as the valid roles\users are set on initialisation they are set forever once created. To do what you want to do you'll probably need to write your own validation attribute that gets the list of valid users\roles from some other location rather than the attribute parameters. I'm sure if you google for how to override the default validation attributes, or how to write your own you'll find some sample code, they're fairly straight-forward.

Dirk Bahle3-Jul-17 9:56

Dirk Bahle

3-Jul-17 9:56

Hi,

does anyone have a simple ASP.NET code snippet that accepts a internal Windows user name as a parameter and can retrieve the real name (first and last name) and the user group membership via LDAP?

Are there any spcial pre-requisites to implement this or
can this be done with built in ASP.NET means?

Thanks Dirk

Re: LDAP Group List for Windows User

F-ES Sitecore3-Jul-17 23:15

Get the query string with parameteres ( parameter value can be change)

3-Jul-17 23:15

Plenty of code samples for this if you google

How to get Full Name from AD/LDAP? | The ASP.NET Forums[^]

Member 44632353-Jul-17 1:35

Member 4463235

3-Jul-17 1:35

Hi ,
Need to get the query string with values on button click with or with out using jquery .
like if my url is like this:
http://localhost:56121/Reports/ProjectScorecardByFilter?id=3" , here want to change the id value to 4 then click on button . In the controller method need to get the value of id as 4 .

Re: Get the query string with parameteres ( parameter value can be change)

Richard Deeming3-Jul-17 1:51