public virtual bool ChangeColumnDataType (Microsoft.Office.Interop.MSProject.PjFieldTypes Type = Microsoft.Office.Interop.MSProject.PjFieldTypes.pjCostField, object Column);
Public Overridable Function ChangeColumnDataType (Optional Type As PjFieldTypes = Microsoft.Office.Interop.MSProject.PjFieldTypes.pjCostField, Optional Column As Object) As Boolean