Web Forms :: How To Check If File Exists Before Upload
Dec 15, 2010I am trying to check if a file already exists before uploading a file. I have the following code but it doesn't work whether the file exists or not.
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I am trying to check if a file already exists before uploading a file. I have the following code but it doesn't work whether the file exists or not.
[Code]....
I have two websites. One site contains nothing but image files. This is a sub-domain of the main website. The main website allows the user to search a database of information and displays that information. I create a grid with a link to the file. In my row_databound function, I want to check to see if that file exists on my other website. If it doesn't I remove the link, otherwise I leaves a link to that file. how to verify that the LINK actually goes to a file that exists?
View 2 RepliesWhat is the way to :
1) Check if a file exists on an FTP site.
2) Sample the size of that ftp file (3) times to ensure the file is ready for downloading.
We have some classes doing this already but they are using WebRequestMethods.Ftp.ListDirectoryDetails and then searching there in if file exists. I am hoping there are some clean ways to do this.
I am using the async file upload control to upload to a image file. I want the user to upload only jpg files. And for that I am checking the uploadedfile content type in server side, after the upload complets. I wanna check this, before upload starts. There is one javascript method
function startUpload(sender, args){}
but how to access the content type of the file selected by user.
I am learning a tutorial, it is about saving mp3 files in database.
Have a look below picture i can upload a mp3 file multiple time with the same name how to avoid it?
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protected void btnUpload_Click(object sender, EventArgs e)
{
using (BinaryReader br = new BinaryReader(FileUpload1.PostedFile.InputStream))
{
byte[] bytes = br.ReadBytes((int)FileUpload1.PostedFile.InputStream.Length);
string strConnString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
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I want if a file exists then it ask for "do u want 2 overwrite ?" with yes or no confirmation ,,, if yes then overwrite otherwise not.
I want to do this with of ConfirmationExtender with a textbox because the user can enter some info like who is the user and overwrite on what reason.
I'd like to use a simple switch to display one image or another but I need a way to find out if the image exists.
If FILEEXISTS("pathtojpg") Then
'Display jpg
Else
'Display "no_image_yet.jpg"
End If
How to check if a file exists on different domain?
If File.Exists("http://i1.asp.net/common/header/logo.png?cdn_id=01112010_2") Then
Return String.Format("<img src={0} alt='' />", "http://i1.asp.net/common/header/logo.png?cdn_id=01112010_2"
Else
Return String.Empty 'always ends here [:(]
End If
I need to check if a text file exists on a site on a different domain. The URL could be:
http://sub.somedomain.com/blah/atextfile.txt
I need to do this from code behind. I am trying to use the HttpWebRequest object, but not sure how to do it.
EDIT: I am looking for a light weight way of doing this as I'll be executing this logic every few seconds
I am taking backup for mdb file from source location to destination location.While using file.copy() function,how to check whether the folder is already exists or not.If exists means how to replace new one for existing one.Send C# code for replace new one for existing one.
View 1 Repliesweb application How to check file exists on local machine..?
View 1 RepliesI am still in the same project. Its been so hard to complete it. Always one or other problem.
I am using sqlserver 2005 and vb.net and vs2008- not that any of this matter for this question.
My problem is that I couldnt' check if the record exisist in the db. How do I do it.
I have fileupload control but I want to check my db if the filename already exisit.
Thi sis my code.
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I'm having some trouble trying to create a page for my web app. I'm not trying to write a simple download/upload page. Should also say that I'm not trying to write a complex one.What I need to do is in the PageLoad check if the user has installed one particular software and then show the right message to download and install OR run it from the user's actual installation. For this scenario I've tried to use different file upload controls to check if the file was on the client machine, but none of then can do this, since, for security reasons,I can't programmatically set the path and file to upload.
View 5 RepliesIs there any way to check the size of a file that is being uploaded before its uploaded? Below i have code that works, but it doesnt check the file size until its uploaded.
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I need upload multiple images and check before image size, I don't wanna use JQuery but if is necessary i can use it, some of you have or know one example.
View 1 RepliesI'm a beginner i work with visual studio 2005 and ajax 1.0
i have a web page with a control input i must to check the weight of the file but in javascript WITHOUT ActiveXObject !?
Is there a file upload control for ASP.Net which performs a client-side checksum calculation (CRC, MD5, etc) on the file contents and transmits the checksum to allow for server-side checksum validation?
I have looked through answers on several file upload questions, but did not find this feature mentioned anywhere.
I want to check the selected file size BEFORE uploading a file with the asp fileupload component.I can not use activex because the solution have to works on each browser (firefox, Chrome, etc..)How can I do that ?
View 3 RepliesHow can i check whether the file is selected in file upload or not
View 1 RepliesI was wondering if there is a method where i can check to see if the file that a user is uploading is either one of the following formats:
Quote:
.doc
.docx
.pdf
I currently upload like so:
PHP Code:
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Now is there a way i can check to see if the files are of the above formats and limit the users to only be able to upload files of this format?
Check whether the value inside the text box is a valid url or not
View 1 RepliesI was wondering how to check if a label exists in a placeholder??
View 4 Replieswhat is code of "user already exists in database" using asp.net 3.5
View 1 RepliesCan we check that user entering an email id is really exists or in working???
View 1 Repliesi have simple code. in which i want to check whether file is uploaded or not. but HasFile return false. I think every thing is ok but not working. how i will upload only images instead of "All Files"
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