Questions tagged [asp.net]
ASP.NET is a Microsoft web application development framework that allows programmers to build dynamic web sites, web applications and web services. It is useful to use this tag in conjunction with the project type tag e.g. [asp.net-mvc], [asp.net-webforms], or [asp.net-web-api]. Do NOT use this tag for questions about ASP.NET Core - use [asp.net-core] instead.
asp.net
374,724
questions
2159
votes
42
answers
810k
views
How do I format a Microsoft JSON date?
I'm taking my first crack at Ajax with jQuery. I'm getting my data onto my page, but I'm having some trouble with the JSON data that is returned for Date data types. Basically, I'm getting a string ...
1592
votes
48
answers
1.2m
views
A potentially dangerous Request.Form value was detected from the client
Every time a user posts something containing < or > in a page in my web application, I get this exception thrown.
I don't want to go into the discussion about the smartness of throwing an ...
- 28.3k
1520
votes
41
answers
498k
views
Path.Combine for URLs?
Path.Combine is handy, but is there a similar function in the .NET framework for URLs?
I'm looking for syntax like this:
Url.Combine("http://MyUrl.com/", "/Images/Image.jpg")
which would return:
"...
- 31.7k
1445
votes
31
answers
761k
views
JavaScriptSerializer - JSON serialization of enum as string
I have a class that contains an enum property, and upon serializing the object using JavaScriptSerializer, my json result contains the integer value of the enumeration rather than its string "...
- 58.9k
1315
votes
61
answers
830k
views
Could not find a part of the path ... bin\roslyn\csc.exe
I am trying to run an ASP.NET MVC (model-view-controller) project retrieved from TFS (Team Foundation Server) source control. I have added all assembly references and I am able to build and compile ...
- 14k
1179
votes
16
answers
997k
views
Maximum request length exceeded.
I am getting the error Maximum request length exceeded when I am trying to upload a video in my site.
How do I fix this?
- 30.1k
1148
votes
24
answers
1.5m
views
How to set the Content-Type header for an HttpClient request?
I'm trying to set the Content-Type header of an HttpClient object as required by an API I am calling.
I tried setting the Content-Type like below:
using (var httpClient = new HttpClient())
{
...
- 15.8k
970
votes
18
answers
1.2m
views
If a folder does not exist, create it
I use a FileUploader control in my application. I want to save a file to a specified folder. If this folder does not exist, I want to first create it, and then save my file to this folder. If the ...
- 15.3k
941
votes
19
answers
1.6m
views
Change the selected value of a drop-down list with jQuery
I have a drop-down list with known values. What I'm trying to do is set the drop down list to a particular value that I know exists using jQuery.
Using regular JavaScript, I would do something like:
...
- 10.5k
927
votes
14
answers
460k
views
Ajax request returns 200 OK, but an error event is fired instead of success
I have implemented an Ajax request on my website, and I am calling the endpoint from a webpage. It always returns 200 OK, but jQuery executes the error event.
I tried a lot of things, but I could not ...
- 20.3k
911
votes
43
answers
1.4m
views
Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters
I want a regular expression to check that:
contains at least eight characters,
including at least one number and
includes both lower and uppercase letters and
include at least one special characters, ...
- 9,267
887
votes
23
answers
268k
views
ASP.NET Web Site or ASP.NET Web Application?
When I start a new ASP.NET project in Visual Studio, I can create an ASP.NET Web Application or I can create an ASP.NET Web Site.
What is the difference between ASP.NET Web Application and ASP.NET ...
- 25.3k
824
votes
12
answers
685k
views
How can I retrieve Id of inserted entity using Entity framework?
I have a problem with Entity Framework in ASP.NET. I want to get the Id value whenever I add an object to database. How can I do this?
According to Entity Framework the solution is:
using (var context ...
- 8,273
800
votes
20
answers
800k
views
In C#, what is the difference between public, private, protected, and having no access modifier?
All my college years I have been using public, and would like to know the difference between public, private, and protected?
Also what does static do as opposed to having nothing?
- 21.9k
786
votes
12
answers
331k
views
739
votes
36
answers
445k
views
How do you create a dropdownlist from an enum in ASP.NET MVC?
I'm trying to use the Html.DropDownList extension method but can't figure out how to use it with an enumeration.
Let's say I have an enumeration like this:
public enum ItemTypes
{
Movie = 1,
...
738
votes
9
answers
1.4m
views
How to get the URL of the current page in C# [duplicate]
Can anyone help out me in getting the URL of the current working page of ASP.NET in C#?
apekshabs
736
votes
31
answers
798k
views
Can I set an unlimited length for maxJsonLength in web.config?
I am using the autocomplete feature of jQuery. When I try to retrieve the list of more then 17000 records (each won't have more than 10 char length), it's exceeding the length and throws the error:
...
- 59.3k
729
votes
53
answers
1.6m
views
The request was aborted: Could not create SSL/TLS secure channel
We are unable to connect to an HTTPS server using WebRequest because of this error message:
The request was aborted: Could not create SSL/TLS secure channel.
We know that the server doesn't have a ...
- 18.7k
682
votes
16
answers
311k
views
Escape @ character in razor view engine
I am creating a sample ASP.NET MVC 3 site using Razor as view engine. The razor syntax starts with @ character e.g. @RenderBody(). If I write @test on my cshtml page it gives me parse error
CS0103: ...
- 17.9k
676
votes
9
answers
229k
views
ASP.NET MVC - Set custom IIdentity or IPrincipal
I need to do something fairly simple: in my ASP.NET MVC application, I want to set a custom IIdentity / IPrincipal. Whichever is easier / more suitable. I want to extend the default so that I can call ...
- 31.1k
609
votes
53
answers
1.1m
views
IIS 500.19 with 0x80070005 The requested page cannot be accessed because the related configuration data for the page is invalid error
I want to upload my own asp.net website on IIS with IIS Manager. But when I do this, I get the following error
HTTP Error 500.19 - Internal Server Error The requested page cannot be
accessed ...
- 11.3k
607
votes
22
answers
410k
views
Unable to update the EntitySet - because it has a DefiningQuery and no <UpdateFunction> element exist
I am using Entity Framework 1 with .net 3.5.
I am doing something simple like this:
var roomDetails = context.Rooms.ToList();
foreach (var room in roomDetails)
{
room.LastUpdated = ...
- 9,351
590
votes
9
answers
123k
views
Compile Views in ASP.NET MVC
I want an msbuild task to compile the views so I can see if there are compile time errors at well... compile time. Any ideas?
- 14.9k
548
votes
27
answers
423k
views
How to enable external request in IIS Express?
How can I enable remote requests in IIS Express? Scott Guthrie wrote that is possible but he didn't say how.
- 5,495
538
votes
16
answers
827k
views
How to Deserialize XML document
How do I Deserialize this XML document:
<?xml version="1.0" encoding="utf-8"?>
<Cars>
<Car>
<StockNumber>1020</StockNumber>
<Make>Nissan</Make>
...
- 40k
526
votes
4
answers
323k
views
What is the difference between 'classic' and 'integrated' pipeline mode in IIS7?
I was deploying an ASP.NET MVC application last night, and found out that it is less work to deploy with IIS7 set to integrated mode. My question is what is the difference? And what are the ...
- 114k
499
votes
38
answers
527k
views
Login failed for user 'IIS APPPOOL\ASP.NET v4.0'
I have a web project (C# Asp.Net, EF 4, MS SQL 2008 and IIS 7) and I need to migrate it to IIS 7 locally (at the moment works fine with CASSINI).
Locally in IIS I have my Default Web Site with my ...
- 73.3k
493
votes
13
answers
474k
views
WCF - How to Increase Message Size Quota
I have a WCF Service which returns 1000 records from database to the client. I have an ASP.NET WCF client (I have added service reference in asp.net web application project to consume WCF).
I get ...
- 6,950
492
votes
21
answers
197k
views
Stop Visual Studio from launching a new browser window when starting debug?
I already have a window open with the web site I'm debugging. I don't need VS to launch another one for me every time I need to debug.
Is there a way to stop this behavior?
- 18.2k
488
votes
30
answers
522k
views
488
votes
18
answers
233k
views
jQuery $(document).ready and UpdatePanels?
I'm using jQuery to wire up some mouseover effects on elements that are inside an UpdatePanel. The events are bound in $(document).ready . For example:
$(function() {
$('div._Foo').bind("...
- 49.8k
483
votes
20
answers
276k
views
Can an ASP.NET MVC controller return an Image?
Can I create a Controller that simply returns an image asset?
I would like to route this logic through a controller, whenever a URL such as the following is requested:
www.mywebsite.com/resource/...
- 32.7k
476
votes
40
answers
1.1m
views
HTTP Error 503, the service is unavailable
I'm really new to setting up web servers in general. I've got IIS 8 on Windows 8, and I'm trying to set up a little site locally, while doing some development. In IIS I choose Add Site, give a name, ...
- 5,571
475
votes
4
answers
522k
views
Server.MapPath("."), Server.MapPath("~"), Server.MapPath(@"\"), Server.MapPath("/"). What is the difference?
Can anyone explain the difference between Server.MapPath("."), Server.MapPath("~"), Server.MapPath(@"\") and Server.MapPath("/")?
- 29k
445
votes
40
answers
797k
views
Cannot read configuration file due to insufficient permissions
I've recently encountered an error trying to host my asp.net site with IIS. I have found a solution that many swear by.
Solution:
Add IIS_IUSRS with Read permission on files in the folder
Change ...
- 31.7k
444
votes
9
answers
119k
views
One DbContext per web request... why?
I have been reading a lot of articles explaining how to set up Entity Framework's DbContext so that only one is created and used per HTTP web request using various DI frameworks.
Why is this a good ...
- 11.2k
435
votes
14
answers
501k
views
An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode
I installed DotNetOpenAuth SDK-3.4.5.10201.vsix, and I can't get it working. It works locally (when I run as localhost), but when I try to publish it doesn't work.
The IIS error message I get is:
...
- 5,439
435
votes
4
answers
341k
views
IIS AppPoolIdentity and file system write access permissions
Here's an issue with IIS 7.5 and ASP.NET that I've been researching and getting nowhere with. Any help would be greatly appreciated.
My question is: using ASP.NET in IIS 7.5, how does IIS and/or the ...
- 27.2k
434
votes
11
answers
640k
views
POSTing JsonObject With HttpClient From Web API
I'm trying to POST a JsonObject using HttpClient from Web API. I'm not quite sure how to go about this and can't find much in the way of sample code.
Here's what I have so far:
var myObject = (...
- 21.5k
433
votes
50
answers
355k
views
How do you force Visual Studio to regenerate the .designer files for aspx/ascx files?
Sometimes when I'm editing page or control the .designer files stop being updated with the new controls I'm putting on the page. I'm not sure what's causing this to happen, but I'm wondering if there'...
432
votes
30
answers
466k
views
Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive
I'm trying to up load my site and I'm getting this error message:
Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.
<compilation debug="true" ...
- 4,319
430
votes
22
answers
748k
views
How to get a user's client IP address in ASP.NET?
We have Request.UserHostAddress to get the IP address in ASP.NET, but this is usually the user's ISP's IP address, not exactly the user's machine IP address who for example clicked a link. How can I ...
- 5,527
423
votes
10
answers
198k
views
ASP.NET Identity - HttpContext has no extension method for GetOwinContext
I have downloaded, and successfully ran the ASP.NET Identity sample from here:
https://github.com/rustd/AspnetIdentitySample
I am now in the middle of implementing the ASP.NET Identity framework in ...
- 30.6k
418
votes
26
answers
1.3m
views
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated
I have many users on my web site (20000-60000 per day), which is a download site for mobile files. I have remote access to my server (windows server 2008-R2). I've received "Server is ...
- 20.2k
405
votes
20
answers
155k
views
Visual Studio 2017 error: Unable to start program, An operation is not legal in the current state
After fresh installation of Visual Studio 2017 I tried to run .NET Core Web project and when trying to run it on Chrome I am getting this error:
Unable to start program, An operation is not legal ...
- 7,669
403
votes
10
answers
510k
views
How to get current page URL in MVC 3
I am using the Facebook comments plugin on a blog I am building. It has some FBXML tags that are interpreted by the facebook javascript that is referenced on the page.
This all works fine, but I have ...
- 58.8k
402
votes
11
answers
497k
views
Response Content type as CSV
I need to send a CSV file in HTTP response. How can I set the output response as CSV format?
This is not working:
Response.ContentType = "application/CSV";
- 15.3k
400
votes
27
answers
256k
views
Can I automatically increment the file build version when using Visual Studio?
I was just wondering how I could automatically increment the build (and version?) of my files using Visual Studio (2005).
If I look up the properties of say C:\Windows\notepad.exe, the Version tab ...
- 30k
398
votes
22
answers
451k
views
"The Controls collection cannot be modified because the control contains code blocks"
I am trying to create a simple user control that is a slider. When I add a AjaxToolkit SliderExtender to the user control I get this (*&$#()@# error:
Server Error in '/' Application. The ...
- 4,247