File Upload & Delete in asp.net -

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how can upload file without clicking submit button & how delete uploaded file in asp.net? can upload can't delete uploaded file.my code behind source: 

public partial class webform1 : system.web.ui.page {     protected void page_load(object sender, eventargs e)     {      }      public void uploaddocument(object sender, eventargs e)     {         fudocument.saveas(server.mappath("~/documents/" + path.getfilename(fudocument.filename)));         lblmsg.visible = true;     } }

}

to upload file, can use javascript - there many examples of on , web in general. such as:

https://cmatskas.com/upload-files-in-asp-net-mvc-with-javascript-and-c/

you "can't delete" file. how trying delete , happens when try? if it's exception, message , stack trace?


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