"2017-05-30" WebForm file Upload

Use the FileUpload control to upload the file.

<asp:fileupload id= "FileUpload1" runat= "Server"/>

The Accept= property ". Jpg,.jpeg,.png" setting can only be seen by the file type.

1. Upload command execution on the server

2, in JS control the size of the upload file

1<script type="Text/javascript">2document.getElementById ("Button1"). onclick =function () {3         varFL = document.getElementById ('FileUpload1');4         if(Fl.value.length <=0) {5document.getElementById ('Label1'). InnerHTML ="Please select the file you want to upload first!";6             return false;7         }8         Else {9            if (Fl.files[0].size > 1024x768 * 4) {Tendocument.getElementById ('Label1'). InnerHTML ="file too large, not allowed to exceed 4MB size! "; One                 return false; A             } -         } -     } the</script>

3. Limit the size of uploaded files on the server

1  if 1024x768 1024x768 4 )2        {3             " file too large! "; 4             return ; 5         }

4. Limit the types of files you see :

Accept= ". Jpg,.jpeg,.png" To add this property setting in the control.

5. Expansion

In the <system.web> tag in Web. config
Change to

"2017-05-30" WebForm file Upload