Nettier & Infragistics 2006 V3 for .Net 2.0 , Please help me now!!!

I'm using TList<> object to bind an entity collection to a UltraGrid by using BindingSource class (by an advice from Infragistics). But when a database field can have null value, UltraGrid can't detect what type of Ultra column is. Please  help me solve this problem. Thanks in adv!
 

What do you mean it can't detect the type of column?  The property descriptors are set and are there for usage.  Can you post the actual error message you see?

TList list=CustomerSv.GetAll(); ugGuarantee.Text = "Title Grid"; ugGuarantee.DisplayLayout.CaptionAppearance.FontData.Bold = DefaultableBoolean.True; Ultragrid1.DataSource = VeinsrList; ... i hope help you ...ok

TableService service=new TableService (); 

TList<Table> List=service.GetAll();

Ultragrid.DataSource = List;

We use infragistics controls and they work.  However we don't bind directly to the ultra controls, we use the BindingSource objects available in .Net 2.0 for binding.

So, assuming you drag a BindingSource on your design surface, you point the UltraGrid's DataSource to the BindingSource, and then set the TList<> to the BindingSource's DataSource.

In order to get Infragistics to generate columns based on your type, while in design mode, you can set the DataSource of the BindingSource to the type of the object you're going to bind to.

A lot of this should be done by/through the designer, but I'm  going to code a rough sketch for you:

 

BindingSource tableBindingSource = new BindingSource();

tableBindingSource.DataSource = typeof(Table);

Ultragrid1.DataSource = tableBindingSource;

 

Then whenever you get your actual data, u just set the BidindingSource's DataSource as follows:

tableBindingSource.DataSource = new TableService().GetAll();