Set data type (xml) for a field in data table, using Visual Studio

Hi I have datatype for a field recently converted to xml from varchar(MAX) in SqlServer DB. I want to set this type for the corresponing field in the data table, but it has no option for xml. Any suggestion ?

Thanks

using VS 08 and SQL SERVER 08

alt text http://img708开发者_如何学Go.imageshack.us/img708/3888/53987921.jpg

---

The SQL type xml will convert happily enough to System.String. I'd use that.