C# - Understand This RegEx Statement / Validate Filename From Asp FileUpload Control To Allow Only Jpeg And Gif Files?
Feb 18, 2010
Please help to understand this RegEx statement in details. It's supposed to validate filename from ASP.Net FileUpload control to allow only jpeg and gif files. It was designed by somebody else and I do not completely understand it. It works fine in Internet Explorer 7.0 but not in Firefox 3.6.
I have a FileUpload control that currently uploads pics to the Photos folder on my server. What I would like to know is how would I give it a randomly generated filename when it gets uploaded? As I don't want duplicates later on down the line. Cheers.(Code below).
I am working on ASP.NET3.5 platform. I have used a file upload control and a asp button to upload a file. Whenever i try to upload a file which contain special characterlike (file#&%.txt) it show crash and give the messeage "Server Error in 'myapplication' Application." A potentially dangerous Request.Files value was detected from the client (filename="...New Text &#.txt"). Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Files value was detected from the client (filename="...New Text &#.txt"). Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. how can i prevent this crash using javascript at client side?
I have an application where the user uploads files.
GOAL:
I need to check the file name for special characters and replace them with an underscore. Is there a Select Statement OR IF Statement I can use to search the fileName for unwanted special charaters; those characters will be replaced with a blank or underscore?
I want to replace ampersand, Number sign, Apostrophe, and so on.
I have created a asp.net webpage for viewing daily downloaded newspaper, saved as a pdf file in a selected folder (~/NEWS/{0}) within the web root directory. Also i have a SQL datasource linked, where the news table has two columns viz: date and filename.
I want to create a tiled listview where the date text is visible on the hyperlink. on clicking the hyperlink, the file name is retreived for the corresponding date and the pdf file opens in a fresh page.
I have tried going to the item template in listview and replacing the label control with a hyperlink control, but then not able to successfully proceed ahead.
here i define if (fup1.PostedFile.ContentLength < 102400) this size for image but when i upload image that has more than this 100KB it show error ===File size of 756 KB is exceeding the uploading limit but it upload file i don't want users can upload file morethan 100KB but here show error but upload image why?
I have a detailsview with an upload image to the database. Image is save as binary file in database, and imagename is the name of the file. I'm able to load the image to the database using FileUpload. How do I get the image name to the database? Is there any method like OnInserting or something that allows me to retrieve the file name and save to database?
i want to upload files that are only jpeg, jpg etc. But i couldn't filter the files in the opening window. I want to change the text "all files" to jpeg etc. in the asp.net. (C#)
Can I upload files without having a fileupload control? I was looking at the HttpFileCollection class, but I believe that only works with the fileupload control.
I'm testing a very simple aspx page on Visual Studio's own ASP.NET Development Server(the local server). On the webpage there is a FileUpload control which can upload jpg file up to 2MB without problems. On uploading bigger files, the browser immidiately show "The web page cannot be displayed". It does not show any exception which really puzzles me. "The web page cannot be displayed" is normally caused by network problem, but in this case it's a local server and it can handle smaller jpg file fine. Whta's the problem here?
We need to upload multiple files using ASP.Net in one go. One option is to use the ASP.Net FileUpload control but it seems that it can't upload multiple files in one go. Any other option or ASP.Net FileUpload control can do multiple uploads in one go with some tuning?
I have many (>600) EPS files(300 KB - 1 MB) in database. In my ASP.NET application (using ASP.NET 4.0) I need to retrieve them one by one and call a web service which would convert the content to the JPEG file and update the database (JPEGContent column with the JPEG content). However, retrieving the content for 600 of them itself takes too long from the SQL management studio itself (takes 5 minutes for 10 EPS contents).
So I have two issues:-
1) How to get the EPS content ( unfortunately, selecting certain number of content is not an option :-( ):-
Approach 1:-
foreach(var DataRow in DataTable.Rows) { // get the Id and byte[] of EPS // Call the web method to convert EPS content to JPEG }
or
foreach(var DataRow in DataTable.Rows) { // get only the Id of EPS // Hit database to get the content of EPS // Call the web method to convert EPS content to JPEG }
or
Any other approach?
2) Converting EPS to JPEG using a web method for >600 contents. Ofcourse, each call would be a long running operation. Would task parellel library (TPL) be a better way to achieve this?
Also, is doing the entire thing in a SQL CLR function a good idea?
EDIT :- Unfortunately, I have to do this in the ASP.NET application itself and doing that in a separate process like Windows service is not an option.
I'm trying to use an asp:FileUpload Control to allow users to upload files (.doc, .gif, .xls, .jpg) to a server that is outside of our DMZ and not the Web Server. We want to have the ability to look at these files for viruses, structure, etc prior to saving them into another directory that would allow access to outside users. From what I have read about this control is that it will allow for files to be uploaded to the web server. Can this control be used to upload files to a server other than the web server? If it can be done where should I look for this type of functionality or how do I force it to go to https:servernamefolder name (Where server name is not the web server)? Would I have to read the file then write it to the other server?
In continuation to my previous research at this link : Security Risks or concerns with the use of FileUpload control of asp.net - how to Scan files during upload, also how to intimate user if file is virus affected and abort the operation. In addition to above, we have McAfee Antivirus installed on our servers. I heard that there is some APIS for this work for Symantac Antivirus but I am not sure about McAfee antivirus.
In my website,I have a home page in which by clicking on an image button,I get redirected to a different .apsx page .This page consists of a FileUpload control and 2 buttons(ATTACH,CANCEL).When a user selects/browses a file from his local machine and click ATTACH button,I display that file in a GRIDVIEW and also push the details of that file like Filename into a DATATABLE. The user in this way can browse multiple files and all of them are added to GridView and also pushed to DATATABLE.Now when the user clickes CANCEL button,I am sending the whole DATATABLE in a session object to the HOME page.Upon clicking SAVE button in the home page,the files in the DATATABLE must get stored in a physical location that I mention in the code. The problem that I am facing is that when I write
The files are not at all getting saved in the location. However If I pass the FileUpload control using Session from the second page,
FileUpload fl=(FileUpload)Session["FileUpload"]
The files are getting saved with the correct filenames but the content of all the files consists of the content of the latest uploaded file.I know what the problem is but unable to get a solution. My Requirement is to save the files in a physical path only after clicking the Save button in the home page.
I use file upload control.........and below this there is upload button which include programming to upload file.........
It is working fine for file size of less than 2mb but when i pick file of 5 mb(say) and i click on file upload button or any other button then outcome is
Internet Explorer cannot display the webpage
I placed break point on upload button but control doesn't go their..........
I have a webpage where by user can upload jpg file through browse control on my server. Functionality working fine.
I have concern that if any one create virus and assemble it in a form of jpg and upload it on my server which can crash the hard disk or any other disaster.
the first file selected uploads perfectly - every subsequent file is 0bytes. The code for the upload button is presented below.
Protected Sub cmdUpload_Click(sender As Object, e As EventArgs) Handles cmdUpload.Click Dim hfc As HttpFileCollection = Request.Files For i As Integer = 0 To hfc.Count - 1 If i < 9 Then team = "/Team0" & i + 1 & "/" If i > 8 Then team = "/Team" & i + 1 & "/" Dim myFtpWebRequest As FtpWebRequest
I need to validate if a the ID number that the user typed in my site is a valid ID.
How do I check it?
Do I need to use RegularExpressionValidator?
More over, I also need to validate the credit card number, I found a few RegularExpressions for that in the net but each one is different from the other and I am not sure which one to use.. Does anyone know od a working expression that will suit all credit cards?
I want to validate complete Email address. I am not asking to match using pericular string. but suppose someone enter email id a@bnm.com then first the bnm should be validated and if such domain found then also it should check for such a@bnm.com is available or invalid.???
I had implemented FileUpload code. In which for every particular Id, it creates Folder/Directory (if not exist) on Page _load.Then inside that particular Id's folder it will upload single or multiple files.
