<input type="file" id="txtFile" style="display:none;" runat="server" />
<input type="text" id="txtFakeText" readonly="readonly" />
<input type="button" value="Navegar" style="position:fixed" önclick="HandleFileButtonClick();" />
function HandleFileButtonClick() {
debugger;
var file = document.getElementById('txtFile');
file.click();
var doc = file.value;
document.getElementById("txtFakeText").value = doc;
document.getElementById('txtFile').value = doc;
}