Web Forms :: FileUpload And MaxRequestLength: Why Does Application Know So Fast And Form Know So Slow Of Exces

May 11, 2010

Let's say you set maxRequestLength to the max number (2097151) (units are KB) and use the following code for your OnClick event for your submit button:

int int fileSize = FileUpload1.PostedFile.ContentLength;

if (fileSize < 2000000)//units are bytes
Label1.Text="too big";
else
{
FileUpload1.SaveAs(saveItHerePath);
Label1.Text = "Upload success.";
}

Why when a huge file is attempted does it take a minute to get to the OnClick event on the server? Because if maxRequestLength were set to that value 2000, it would immediately choke if you tried to upload a 500MB file. What is going on here? What are the best practices for using the FileUpload control? Is there a better alternative way of uploading or checking for file size?

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