asp.net - Passing null in textboxes not working -

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hi m trying pass null values in date textboxes textbox 3 , textbox 4 not able so. please let me know doing wrong. need when page load , textboxes empty need gridview load entire table . @ present loads when enter date range if leave date textboxes empty empty page.i have ajax calendar extension drop down calendar control attached these 2 text boxes. don't know if problem. please help..

here code

<asp:sqldatasource id="sqldatasource2" runat="server"     connectionstring="<%$ connectionstrings:ingestconnectionstring %>"     selectcommand="select id, story_number, date, memory_card, story_name library (story_name '%' + @story_name + '%') , (story_number '%' + @story_number + '%') , (@startdate null or @startdate = '' or date >= @startdate) , (@enddate null or @enddate = '' or date <= @enddate)">     <selectparameters>         <asp:controlparameter controlid="textbox1"              name="story_name"             propertyname="text"              defaultvalue="%" />         <asp:controlparameter controlid="textbox2"              defaultvalue="%"              name="story_number"             propertyname="text" />         <%--<asp:controlparameter controlid="dropdownlist1"                  defaultvalue="%"                  name="memory_card"                 propertyname="selectedvalue" />--%>         <asp:controlparameter controlid="textbox3"              name="startdate"              convertemptystringtonull="true"             propertyname="text" />         <asp:controlparameter controlid="textbox4"              name="enddate"              convertemptystringtonull="true"              propertyname="text" />     </selectparameters> </asp:sqldatasource>

it works when put ridiculous date range in default values under not able pass null database see full table when page loads

<asp:controlparameter controlid="textbox3"      name="startdate"      convertemptystringtonull="true"      defaultvalue="1/1/1977"     propertyname="text" /> <asp:controlparameter controlid="textbox4"      name="enddate"      convertemptystringtonull="true"      defaultvalue="1/1/2100"     propertyname="text" />

update:

where add code? adding in control parameter this

<asp:controlparameter controlid="textbox4"      name="enddate"      sqldatasource2.cancelselectonnullparameter="false"      propertyname="text" />

it gives me following error when

literal content ('<asp:controlparameter controlid="textbox4" name="enddate" sqldatasource2.cancelselectonnullparameter="false" propertyname="text" />') not allowed within 'system.web.ui.webcontrols.parametercollection'

cancelselectonnullparameter property of sqldatasource control, not parameters contained in control:

<asp:sqldatasource id="sqldatasource2" runat="server"     cancelselectonnullparameter="false"     connectionstring="<%$ connectionstrings:ingestconnectionstring %>"     selectcommand="select id, story_number, date, memory_card, story_name library (story_name '%' + @story_name + '%') , (story_number '%' + @story_number + '%') , (@startdate null or @startdate = '' or date >= @startdate) , (@enddate null or @enddate = '' or date <= @enddate)">         <selectparameters>             <asp:controlparameter controlid="textbox1" ...

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