Sharepoint 2010 Dataview Webpart Create Trim Function for Multiline Texbox

In Sharepoint 2010 Dataview Webpart Create Trim Function for Multiline Texbox in xslt expresion.
 
for example:
 
SharePoint multi line text box column
 
O/p: SharePoint multi line text....... 
  1. <xsl:value-of select="concat(substring(@Description,1,180),'...')/">  
  2.   
  3. </xsl:value-of>