How to add rows in devexpress gridcontrol by code (winforms C#).

Hi,I wonder if there is an option to add rows in devexpress GridControl ,I have a datasource from database but i need add first row Manual then add datasores. It can be done in a normal datagridview Like this :

datagridview1.Rows.Clear();

Dim I = datagridview1.Row.add
datagridview1.row.add(i).Cells(1).Value="test"

*********************

**** fill gridview1 from database
Dim h dt.Rows.Count
For M=0 to dt.Rows.Conunt-1
     Dim f = datagridview1.Rows.add
           datagridview1.Rows(f).Cells(0).value=dt.Rows(M).Item
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