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.......

<xsl:value-of select="concat(substring(@Description,1,180),'...')/">

</xsl:value-of>