I want to get multiple fields in a SPSiteDataQuery. How do I accomplish
that?

I have tried myDataQuery.ViewFields = "<FieldRefs><FieldRef
Name=\"Title\" /><FieldRef Name=\"Name\" /><FieldRef Name=\"FileRef\"
/><FieldRef Name=\"FileDirRef\" /><FieldRef Name=\"File_x0020_Size\"
/><FieldRef Name=\"FileLeafRef\" /></FiledRefs>";