call two javascript method while Check File Extension and size in File Upload Control

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ASP.NET

Javascript

I am using FileUpload Control to upload Files. In which I have 2 methods in javascript first to check file extension and second for checking file size how to call both methods on Event

onchange

my javascript Code is

var validFilesTypes = ["bmp", "gif", "png", "jpg", "jpeg", "doc", "docx", "xls", "xlsx", "htm", "html", "rar", "zip", "txt", "pdf"];
       function ValidateFile() {
           var file = document.getElementById("<%=txtTenderDoc.ClientID%>");
           var label = document.getElementById("<%=lblTenderDocExceptionMessage.ClientID%>");
           var path = file.value;
           var ext = path.substring(path.lastIndexOf(".") + 1, path.length).toLowerCase();
           var isValidFile = false;
           for (var i = 0; i < validFilesTypes.length; i++) {
               if (ext == validFilesTypes[i]) {
                   isValidFile = true;
                   break;
               }
           }
           if (!isValidFile) {
               label.style.color = "red";
               label.innerHTML = "Invalid File. Unknown Extension Of Tender Doc" + "Valid extensions are:\n\n" + validFilesTypes.join(", ");
               label.focus();
           }
           return isValidFile;
       }

       function validateFileSize() {
           debugger;
           var file = document.getElementById("<%=txtTenderDoc.ClientID%>");
           var label = document.getElementById("<%=lblTenderDocExceptionMessage.ClientID%>");
           var fileSize = file.files[0].size;

           if (fileSize == 0) {
               label.style.color = "red";
               label.innerHTML = "File Size Should be Greater than 0";
               return false;
           }
           else
               return true;
       }

and on aspx page i have called like this

<asp:FileUpload ID="txtTenderDoc" onchange=" return ValidateFile(); return validateFileSize();" runat="server"></asp:FileUpload>

But the problem in only 1st method is called using this
can anyone Help
Thanks
Vishal Pandey