How to avoid this warning: If this attribute value is enclosed...

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ASP.NET

Hi All,
I have used a data source which has the following command

SelectCommand="SELECT  TaskID_Pk,
                            UserName,
                            Asignee,
                            StartDate,
                            Status,
                            Description
                     FROM   TaskList
                     Where  LOWER(Asignee) like LOWER(@Asignee)
                     AND    LOWER(Status)  like LOWER(@Status)
                     AND    LOWER (UserName) like LOWER(@UserName)
                     AND    StartDate >= @StartDate
                     AND    EndDate <= @EndDate";

<SelectParameters>
    <asp:ControlParameter ControlID="drpDown_Asignee"
     Name="Asignee" PropertyName="SelectedValue" Type="String" />
    <asp:ControlParameter ControlID="drpDown_Status"
    Name="Status" PropertyName="SelectedValue" Type="String" />
    <asp:ControlParameter ControlID="drpDown_UserName"
    Name="UserName" PropertyName="SelectedValue" Type="String" />
    <asp:ControlParameter ControlID="StartDate_TextBox"
    Name="StartDate" PropertyName="Text" Type="DateTime" />
   <asp:ControlParameter ControlID="EndDate_TextBox"
    Name="EndDate" PropertyName="Text" Type="DateTime" />
</SelectParameters>

After building this file, I am getting warnings as If this attribute value is enclosed in quotation marks, the quotation marks must match

Note:
This error I am facing due to filtering the dates.

Can anyone give me a better idea to over come the warnings?