ASP.NET Upload Frequently Asked Questions

Complete FAQ for file uploading with ASP.NET 1.x-3.5

Clear HTML File Input

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An HTML file input can't be cleared by normal means (i.e. setting the value to null or an empty string), but because of browser security restrictions, most browsers don't allow this. In many browsers, setting a null value attribute either will have no effect or cause an error. Instead, create a new element that clones the old element and swap the two.

Here's an example:

Page HTML:

<form ...>
    <input id="fileInput" name="fileInput" type="file" />
    <input onclick="clearFileInput()" type="button" value="Clear" />

Javascript code to clear the file input:

function clearFileInput()
    var oldInput = document.getElementById("fileInput");
    var newInput = document.createElement("input");
    newInput.type = "file"; =; =;
    newInput.className = oldInput.className; =;
    // copy any other relevant attributes
    oldInput.parentNode.replaceChild(newInput, oldInput);
SlickUpload ASP.NET Upload Component


Painless ASP.NET file uploads

  • Handle large files
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  • Drag-drop simple, yet highly customizable
  • Solid, responsive support

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