title: DataTable Column with Custom Data Type
body: <p>I have written my own data type that is then used as the type for a column in a datatable.  I am reading XML data from a file.  After I call the ReadXML(file) method, all the cells have values except for the cells in the columns with my data type.  Is there some operator I need to override so that ReadXML(file) can take the data from the file and make a MyDataType out of it?  Also, when I try to sort the defaultview on this column, I get "Object reference not to an instance of an object."  Thanks for any help.</p>