SELECT t.id,
    STUFF(
        (
            SELECT ';'+x.col1
            FROM @MyTable x
            WHERE x.id=t.id
            ORDER BY x.col1
            FOR XML PATH(''),TYPE
        ).value('.','VARCHAR(1000)'),1,1,'') as con_str
FROM @MyTable t
GROUP BY t.id;

We walk in the dark places no others will enter
We stand on the bridge and no one may pass