datagrid column width?

hi,
i am using datagrid to display data, if one of my column data is much lenght(some 1000's of chars). this datagrid display total chars, But my aim is it display only 30 chars after that it display dots, (like our sqlserver if we execute select query, in that table columns contain more characters it display some characters after that it display dots) .
                                                           Please give a solution to do this.
Thanks.