You could use a varbinary or an xml column to save the layout.  The display layout property of the grid has 2 methods         

          1°:  ultragrid.DisplayLayout.Save(Stream);
           2°: ultragrid.DisplayLayout.SaveAsXml(Stream);

1° method: you have to save it on a varbinary column. i would use this one. A varbinary column is an array of byte so the stream must be converted to a byte array before saving into the column!

2° method: you have to save the data on a xml column. So first, the stream must be convertet into xml and than saved on the column.

hope it helps.

HOWTO:How can I save a stream to a database?