Change Image File Size From Fileupload Client Side

Jan 9, 2010

Is anyone aware of how to change an image's file size from a fileupload control with client side javascrip?

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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.

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Using C# .NET 3.5 with VS 2008.

I've been playing with the FileUpload control for an upcoming project where the user is allowed to upload up to five files at once, but each file can only be 5MB in size. Simple enough all I would need to do is add in the httpRuntime element to the web.config and up the file size and timeout.

[Code]....

what I'm really getting at is there a better way to trap if the file size is too large before processing while using the FileUpload control. I would like to be able to keep the user on the same page but update a label control.

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If I want to increase the upload size which part of should I edit in the code below:

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I use file upload control. How I can define that  user can upload 300kb if they upload more than 300kb it show error that they can't upload more than 300KB...

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i use these code to set limit size for image that users want to upload

protected void BtnUploadS_Click(object sender, EventArgs e)
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[Code]....

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?

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I do not want to change the default settings for file upload, 4Mb is more than enough for the project I'm working on. After quite a bit of searching I found two approaches that were purported to work but neither one is preventing the "Maximum request length exceeded" error. The first approach[see ref. #1 below] performs validation with a custom validator and in code behind on the page that contains the FileUpload control. It doesn't work. The second approach [see ref #2 below] performs validation in the Application_BeginRequest event in Global.asax. The author stated that validation must be handled by this event. Quoting: "The way to get past is to use your Application_BeginRequest event to handle the problem.. This event takes place for each request to your application BEFORE the data has been completely uploaded. Here you can check for the content length of the request and then redirect to the some error page or the same page with some value in session or query string so that the page can show appropriate message to the user." Here is my code from Golbal.asax based on the above. As noted, this approach doesn't work either.

protected void Application_BeginRequest(object sender, EventArgs e)
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[Code]....

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I need the full file path..In IE versions higher than 7, FileUploadControl.PostedFile.FileName gives only the filename ..

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[Code]....

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