memberof example using ldap

[Robert Clove]

Hi,
I have to find if user is the member of a group, for this i am using the
following query

(&(objectClass=user)(sAMAccountName=yourUserName)
  (memberof=CN=YourGroup,OU=Users,DC=YourDomain,DC=com))

  (memberof=CN=YourGroup,OU=Users,DC=YourDomain,DC=com)== values from
distinguished name of your group

The above query doesn't work fine even if group doesn't exist,

It always says that user is member of