If I set the default value like:
DefaultValue="@(Guid.NewGuid().ToString())" or
DefaultValue="@Guid.NewGuid().ToString()"
in a column representing a Id the grid is refreshing itself constantly.
<GridColumn Field=@nameof(OrdersDetails.OrderID) HeaderText="Order ID" IsPrimaryKey="true" TextAlign="@TextAlign.Center" HeaderTextAlign="@TextAlign.Center" Width="140" DefaultValue="@(Guid.NewGuid().ToString())"></GridColumn>