Issues and Exceptions Articles

Category - Issues and Exceptions

02 Jun 2022 Mudassar Khan 1 Comments 12330 Views

ASP.Net Issues and Exceptions Email Gmail

Here Mudassar Khan has explained how to solve the issue when Gmail server denies POP3 access for the given Username and Password.

01 Jun 2022 Mudassar Khan 3 Comments 19100 Views

ASP.Net C#.Net VB.Net Issues and Exceptions Google Gmail

Here Mudassar Khan has explained how to resolve the error: The server did not respond with a +OK response. The response was: "-ERR [AUTH] Username and password not accepted." in ASP.Net Application when trying to access Gmail Mailbox using POP3.

01 Jun 2022 Mudassar Khan 0 Comments 2990 Views

ASP.Net C#.Net VB.Net Issues and Exceptions Google Email Gmail

Here Mudassar Khan has explained how to resolve the error: The server did not respond with a +OK response. The response was: "-ERR [AUTH] Application-specific password required" in ASP.Net Application when trying to access Gmail Mailbox using POP3.

10 May 2022 Mudassar Khan 0 Comments 9719 Views

ASP.Net AJAX Issues and Exceptions jQuery JSON MVC

Here Mudassar Khan has explained with an example, how to solve the error which occurs when using AntiForgery Token with jQuery AJAX in ASP.Net MVC.

The required anti-forgery form field "__RequestVerificationToken" is not present.

The above error is caused when AntiForgery Token is not correctly passed to the Controller when with jQuery AJAX in ASP.Net MVC.

27 Apr 2022 Mudassar Khan 0 Comments 11732 Views

ASP.Net Issues and Exceptions MVC

Here Mudassar Khan has explained how to resolve the following error in ASP.Net MVC.

The required anti-forgery cookie "__RequestVerificationToken" is not present.

The above error occurs when the ValidateAntiForgeryToken attribute is added but the anti-forgery cookie is missing.

02 Feb 2022 Mudassar Khan 0 Comments 11556 Views

ASP.Net AJAX Issues and Exceptions jQuery JSON MVC

Here Mudassar Khan has explained how to solve the problem: This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet in ASP.Net MVC Razor.

16 Jul 2021 Mudassar Khan 0 Comments 4567 Views

ASP.Net Issues and Exceptions IIS FileUpload

Here Mudassar Ahmed Khan has explained how to solve the following error in ASP.Net application when hosted on IIS server.

HTTP Error 404.13 - Not Found The request filtering module is configured to deny a request that exceeds the request content length.

The above error occurs when one tries to upload a file larger than the maximum allowed limit.

06 May 2021 Mudassar Khan 0 Comments 29351 Views

ASP.Net AJAX Issues and Exceptions jQuery MVC

Here Mudassar Ahmed Khan has explained with an example, how to return Exception Error Message when using JSON and AJAX in ASP.Net MVC Razor.

This article will illustrate how to return the Exception Error Message using JSON from the Controller when calling the Controller using jQuery AJAX in ASP.Net MVC Razor.

20 Apr 2021 Mudassar Khan 0 Comments 20775 Views

ASP.Net Issues and Exceptions MVC

Here Mudassar Ahmed Khan has explained with an example, how to prevent / avoid / stop Form Resubmission (Resubmit) when Refresh button clicked in Browser in ASP.Net MVC Razor.

The problem is that when browser refresh button or F5 or CTRL + F5 function keys are pressed, the last executed event is again executed.

For example, if you have a Form submission on Button click and after clicking button, page is refreshed by the user then the Form is resubmitted and again same Action method gets called.

08 Feb 2021 Mudassar Khan 1 Comments 55629 Views

ASP.Net C#.Net VB.Net Issues and Exceptions .Net 4.0 ASP.Net 4.5 .Net

Here Mudassar Ahmed Khan has explained with an example, how to solve the error when using DownloadString method of the .Net WebClient class along with SSL3 Security Protocol in C# and VB.Net.

Error: The client and server cannot communicate, because they do not possess a common algorithm

The above error is caused when TLS 1.2 protocol is not used before calling an API or Service and hence there is mismatch in the cryptographic algorithm.

08 Feb 2021 Mudassar Khan 0 Comments 43542 Views

ASP.Net C#.Net VB.Net Issues and Exceptions ASP.Net 4.5 .Net

Here Mudassar Ahmed Khan has explained with an example, how to solve the error when using DownloadString method of the .Net WebClient class in C# and VB.Net.
Error: Could not create SSL/TLS secure channel

The above error is caused when TLS 1.2 protocol is not used before calling an API or Service which uses TLS 1.2 protocol for establishing secure channel for communication.

05 Feb 2021 Mudassar Khan 1 Comments 20250 Views

ASP.Net C#.Net VB.Net Issues and Exceptions

Here Mudassar Ahmed Khan has explained with an example, how to use TLS1.2 in projects using .Net 2.0, .Net 3.0, .Net 3.5 and .Net 4.0 with C# and VB.Net.

But, the support for TLS 1.2 is available in .Net 4.5 onwards and hence this article will demonstrate how to use it in projects other Frameworks such as Net 2.0, .Net 3.0, .Net 3.5 and .Net 4.0 without upgrading them.

09 Oct 2020 Mudassar Khan 0 Comments 29622 Views

ASP.Net Issues and Exceptions IIS FileUpload MVC Core

Here Mudassar Ahmed Khan has explained how to solve the following error in ASP.Net Core.

HTTP Error 404.13 - Not Found The request filtering module is configured to deny a request that exceeds the request content length.

14 Jul 2020 Mudassar Khan 0 Comments 32777 Views

ASP.Net Issues and Exceptions JSON MVC Core

Here Mudassar Ahmed Khan has explained with an example, how to solve the issue of Lowercase JSON Property Names in ASP.Net Core MVC.

In order to solve this problem, the default ContractResolver needs to be replaced with the ContractResolver of Newtonsoft JSON Serializer in ASP.Net Core MVC.

16 Mar 2020 Mudassar Khan 0 Comments 24901 Views

ASP.Net Issues and Exceptions Crystal Reports Button

Here Mudassar Ahmed Khan has explained with an example, how to solve the problem of Print and Export Button of Toolbar not working with Crystal Report Viewer in SAP Crystal Reports in ASP.Net.

25 Feb 2020 Mudassar Khan 0 Comments 15793 Views

ASP.Net Issues and Exceptions Label

Here Mudassar Ahmed Khan has explained with an example, how to solve the problem of ASP.Net Label value assigned in Client Side not appearing in PostBack.

ASP.Net Label controls do not send values to server and hence their value is lost on PostBack when set on Client Side.

To solve this issue we need to make use of Hidden Field which sends the Client Side modified value to server which can be later retrieved on PostBack in ASP.Net.

14 Feb 2020 Mudassar Khan 0 Comments 33150 Views

ASP.Net Issues and Exceptions FileUpload MVC Core

Here Mudassar Ahmed Khan has explained with an example, how to solve the problem i.e. IFormFile always returns NULL when used in Controller while uploading files in ASP.Net Core MVC.

There are two reasons. First the name of the IFormFile parameter and the name of HTML FileUpload element must be exact same and second that the Form element must be specified with the enctype attribute.

14 Feb 2020 03 Jan 2022 Mudassar Khan 0 Comments 65101 Views

ASP.Net Issues and Exceptions FileUpload MVC Core

Here Mudassar Khan has explained why HttpPostedFileBase not working in ASP.Net Core and what is the alternative solution for using the functionality which is used for uploading Files in ASP.Net Core.

Microsoft has permanently removed HttpPostedFileBase class from ASP.Net Core and introduced a new interface IFormFile for uploading Files in ASP.Net Core 2.0 and ASP.Net Core 3.0.

29 Jan 2020 Mudassar Khan 0 Comments 31745 Views

ASP.Net Issues and Exceptions MVC Core

Here Mudassar Ahmed Khan has explained why Server.MapPath not working in ASP.Net Core and what is the alternative solution for using the functionality in ASP.Net Core.

Microsoft has permanently removed Server.MapPath function from .Net Core and introduced a new interfaces IHostingEnvironment for .Net Core 2.0 and IWebHostEnvironment for .Net Core 3.0.

30 Sep 2019 Mudassar Khan 0 Comments 26253 Views

ASP.Net Issues and Exceptions Web.Config

Here Mudassar Ahmed Khan has explained how to make solve the problem of ValidateRequest = 'false' not working in .Net 4.0 and 4.5 in ASP.Net.

ValidateRequest = 'false' is used to supress the exception: A potentially dangerous Request.Form value was detected from the client in ASP.Net and allow posting scripts and HTML content in ASP.Net.

The ValidateRequest property is a .Net 2.0 and .Net 3.5 property and hence in order to work on .Net 4.0 and .Net 4.5 an additional property is needed.