Asynchronous fileUpLoad control error in ajax tool kit control

Question

i am using the ajax tool kit asynchronous file upload control  i drag and drop from the tool bar then run the page with out writing single line of code it display error when i am browse my file the error is
Normal
0
false
false
false
EN-US
X-NONE
X-NONE
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin-top:0in;
mso-para-margin-right:0in;
mso-para-margin-bottom:10.0pt;
mso-para-margin-left:0in;
line-height:115%;
mso-pagination:widow-orphan;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:"Times New Roman";
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:"Times New Roman";
mso-bidi-theme-font:minor-bidi;}
Message
from webpage
---------------------------
Unhandled
Exception: The file attached is invalid.
---------------------------
OK
---------------------------
i using the following code : of course i not write even single line of code
What is the solution for this

karthick kumar · Answer

Did you download the latest version of the ajax control toolkit.  I think their is a version specific for .net 4.  I would start there.
If you would like to use the Toolkit in .NET 4.0, please use the ASP.NET Ajax Library.
http://www.asp.net/ajaxlibrary/learn.ashx
http://www.asp.net/ajaxlibrary/HOW%20TO%20Use%20the%20AsyncFileUpload%20Control.ashx

hariom · Answer

koti you have to add postback trigger for this error.
and pass control id name to trigger.
hariom