<riaControls:DomainDataSource AutoLoad="False" d:DesignData="{d:DesignInstance my:orderAgentConcernDate, CreateList=true}" Height="0" LoadedData="orderAgentConcernDateDomainDataSource_LoadedData" Name="NameDomainDataSource" QueryName="GetOrderAgentConcernDateQuery" Width="0" Loaded="orderAgentConcernDateDomainDataSource_Loaded" LoadingData="orderAgentConcernDateDomainDataSource_LoadingData">

            <riaControls:DomainDataSource.DomainContext>

                <my1:domserOrderAgentConcernDate />

            </riaControls:DomainDataSource.DomainContext>

            <riaControls:DomainDataSource.QueryParameters>

                <riaControls:Parameter ParameterName="dBeg" Value="{Binding SelectedDate, ElementName=datePicker1}" />

                <riaControls:Parameter ParameterName="dEnd" Value="{Binding SelectedDate, ElementName=datePicker2}" />

            </riaControls:DomainDataSource.QueryParameters>

        </riaControls:DomainDataSource>

public class domserOrderAgentConcernDate : LinqToEntitiesDomainService<entitiesOrderAgentConcernDate>
    {
        public IQueryable<orderAgentConcernDate> GetOrderAgentConcernDate(DateTime dBeg, DateTime dEnd)
        {
            this.ObjectContext.CommandTimeout = 1000000000;
            return this.ObjectContext.orderAgentConcernDateF(dBeg, dEnd).AsQueryable();
        }
}