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omkar shirke 1omkar shirke 1 

how to restrict .xls file upload attachment in a custom object?. A sample code could be very useful...Thanks in advance

Raj VakatiRaj Vakati
You need to write a trigger .. here is the sample code
  
public static final List<string> CONTENT_TYPES = new string[]{'image/gif','image/png','image/jpg'};

for(attachment a: Trigger.new)
{
   if (!isAllowedContentType(a.ContentType)) {
       a.addError('only allowed jpg, gif, png files');
   }    
}
 
Raj VakatiRaj Vakati
Refer this link 

https://salesforce.stackexchange.com/questions/121123/how-to-restrict-file-type-in-standard-page-attach