Asp.net 在linq中如何处理存储过程

我在Northwind database.server MS2008上工作。在linq中，我激活了一个sp，然后显示以下错误：

语法：

<dxwgv:ASPxGridView ID="ASPxGridView1" runat="server" 
            AutoGenerateColumns="False" DataSourceID="LinqServerModeDataSource1" 
            KeyFieldName="CategoryID">
            <Columns>
                <dxwgv:GridViewCommandColumn VisibleIndex="0">
                    <EditButton Visible="True">
                    </EditButton>
                    <NewButton Visible="True">
                    </NewButton>
                    <DeleteButton Visible="True">
                    </DeleteButton>
                </dxwgv:GridViewCommandColumn>
                <dxwgv:GridViewDataTextColumn Caption="CategoryID" FieldName="CategoryID" 
                    VisibleIndex="1">
                </dxwgv:GridViewDataTextColumn>
                <dxwgv:GridViewDataTextColumn Caption="CategoryName" FieldName="CategoryName" 
                    VisibleIndex="2">
                </dxwgv:GridViewDataTextColumn>
                <dxwgv:GridViewDataTextColumn Caption="Description" FieldName="Description" 
                    VisibleIndex="3">
                </dxwgv:GridViewDataTextColumn>
            </Columns>
        </dxwgv:ASPxGridView>

 <dxdtlnq:LinqServerModeDataSource ID="LinqServerModeDataSource1" runat="server" 
        onselecting="LinqServerModeDataSource1_Selecting" />

错误消息：

<dxwgv:ASPxGridView ID="ASPxGridView1" runat="server" 
            AutoGenerateColumns="False" DataSourceID="LinqServerModeDataSource1" 
            KeyFieldName="CategoryID">
            <Columns>
                <dxwgv:GridViewCommandColumn VisibleIndex="0">
                    <EditButton Visible="True">
                    </EditButton>
                    <NewButton Visible="True">
                    </NewButton>
                    <DeleteButton Visible="True">
                    </DeleteButton>
                </dxwgv:GridViewCommandColumn>
                <dxwgv:GridViewDataTextColumn Caption="CategoryID" FieldName="CategoryID" 
                    VisibleIndex="1">
                </dxwgv:GridViewDataTextColumn>
                <dxwgv:GridViewDataTextColumn Caption="CategoryName" FieldName="CategoryName" 
                    VisibleIndex="2">
                </dxwgv:GridViewDataTextColumn>
                <dxwgv:GridViewDataTextColumn Caption="Description" FieldName="Description" 
                    VisibleIndex="3">
                </dxwgv:GridViewDataTextColumn>
            </Columns>
        </dxwgv:ASPxGridView>

 <dxdtlnq:LinqServerModeDataSource ID="LinqServerModeDataSource1" runat="server" 
        onselecting="LinqServerModeDataSource1_Selecting" />

错误1无法将类型“System.Data.Linq.IsingResult”隐式转换为“System.Linq.IQueryable”。存在显式转换（是否缺少转换？

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如何解决此错误。为什么需要cust。如何cust.Plz显示一些语法

原因是过程通常返回IEnumerable结果
您需要一个表值函数来处理IQueryable。有关更多信息，请参阅