代码是： newdcol.DataType = System.Type.GetType("System.Int32") 在HTML里面写入：<asp:checkbox checked='<%#DataBinder.Eval(Container.DataItem,"Send")%>'/>,运行的时候就显示“从类型“DBNull”到类型“Boolean”的强制转换无效”，到底是怎么回事？哪位高手指点一下，感激不尽 ' GroupName='<%#DataBinder.Eval(Container.DataItem, "t-id")%>' Runat="server" Width="50%" BorderColor="Yellow" BackColor="#C0FFFF">' GroupName='<%#DataBinder.Eval(Container.DataItem, "t-id")%>' Runat="server" Width="50%" BorderColor="Yellow" BackColor="#C0FFFF">' GroupName='<%#DataBinder.Eval(Container.DataItem, "t-id")%>' Runat="server" Width="50%" BorderColor="Yellow" BackColor="#C0FFFF">' GroupName='<%#DataBinder.Eval(Container.DataItem, "t-id")%>' Runat="server" Width="50%" BorderColor="Yellow" BackColor="#C0FFFF">' GroupName='<%#DataBinder.Eval(Container.DataItem, "t-id")%>' Runat="server" Width="50%" BorderColor="Yellow" BackColor="#C0FFFF"> ' GroupName='<%#DataBinder.Eval(Container.DataItem, "t-id")%>' Runat="server" Width="50%" BorderColor="Yellow" BackColor="#C0FFFF">