how to Upload any type of files asp.net VB web

I have upload files... this is my upload button:

<div class="col-sm-5"> <label class="btn btn-primary btn-block btn-file"> <input type= "file"name="ctl00$ContentPlaceHolder1$FileUpload1"id="ctl00_ContentPlaceHolder1_FileUpload1"> <img src="../images/pngformat/attachment.png"> Upload here... </label> </div>

but just upload .Zip/.PDF and .JPG files... i need upload any file format ... my code generate by VB .Net 4.5 and use IIS 7

how to set upload any type of files ???