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I set the maxRequestLength ="1024" in my web.config, so everytime the user upload file more than 1MB, it doesn't present any errors, but just display page cannot be displayed. Is there a way to present a message rather than the IE message?
also, how to determine the size of the image when the users upload the image file and crop it?
Internet Explorer, by default, displays a "friendly" error message when it receives an error status code from the server. For development purposes, you may find it best to disable this feature, or use another browser. The option is available at: Tools > Internet Options > Advanced > "Browsing" section > "Show friendly HTTP error messages".
As you've discovered, setting the maximum request length instructs the ASP.NET runtime to prevent any incoming requests that exceed that length from being processed. According to the docs, this would be useful in preventing denial of service attacks that are predicated on large files. There is no way to determine the size of a file, using the HTML standards before it has been uploaded to the server.
Given all that blather and in order to gain more granular control, I would suggest:
1) Use the Global.asax file to catch unhandled exceptions. When the file exceeds the max, a HttpException will be thrown. I'll leave it as an exercise to the reader to figure out how to catch exceptions.
2) Add an extra check within your code to prevent (and/or delete) uploaded files that exceed the maximum.
3) See if you can introduce disk quotas to prevent absolute hell breaking loose.
4) Should you be cropping, or perhaps resizing? ;)