I am getting this exception when I try to add columns to container grid in code. it works fine if I don't add column in code & directly bind the grid to datasource. I am working on Load on Demand sample.

BoundDataField

);

field.DataFieldName =

;

field.DataType =

;

field.Key =

;

field.Header.Text =

;

//field.DataSourceField = new Infragistics.Web.UI.Framework.Data.DataField("WU_ID", typeof(Int32), null, false);