c# - The argument types 'Edm.DateTime' and 'Edm.String' are incompatible for this operation -


i'm trying filter 2 different (data picker's) in same column @ grid. try reach command these 2 fields. whole filtering process going on in code behind, , far working other fields in grid. 1 i'm getting strange exception:

{"the argument types 'edm.datetime' , 'edm.string' incompatible operation. near greater or equals expression, line 6, column 15."}

in db field datetime , single column

my code : 

                    <telerik:gridboundcolumn datafield="entrydate" datatype="system.datetime" dataformatstring="{0:dd/mm/yyyy}" filtercontrolalttext="filter entrydate column"                         headertext="date" sortexpression="entrydate" uniquename="entrydate" filtercontrolwidth="50px">                         <filtertemplate>                                                         <telerik:raddatepicker id="fromorderdatepicker" runat="server" width="100px" autopostback="true"                                 onselecteddatechanged="fromorderdatepicker_selecteddatechanged" onprerender="fromorderdatepicker_prerender" />                                                         <telerik:raddatepicker id="toorderdatepicker" runat="server" width="100px" autopostback="true"                                 onselecteddatechanged="toorderdatepicker_selecteddatechanged" onprerender="toorderdatepicker_prerender" />                          </filtertemplate>                     </telerik:gridboundcolumn>

code behind: 

     protected void fromorderdatepicker_selecteddatechanged(object sender, telerik.web.ui.calendar.selecteddatechangedeventargs e)             {                 raddatepicker picker = sender raddatepicker;                 viewstate["fromdatepicker"] = datetimetostring(picker.selecteddate.value);                  expressionchanged();             }             protected void fromorderdatepicker_prerender(object sender, eventargs e)             {                 if (viewstate["fromdatepicker"] != null)                 {                     raddatepicker picker = sender raddatepicker;                     picker.selecteddate = stringtodatetime(viewstate["fromdatepicker"].tostring());                 }             }     private string datetimetostring(datetime dt)     {         return dt.month + "/" + dt.day + "/" + dt.year;     }     private datetime stringtodatetime(string s)     {         string[] dts = s.split('/');         datetime dt = new datetime(int32.parse(dts[2]), int32.parse(dts[0]), int32.parse(dts[1]));         return dt;     }

it redundant post code (for todatepicker) 

 private void expressionchanged()     {         //reset         timereportgrid.mastertableview.filterexpression = null;         timereportgrid.mastertableview.rebind();           if (viewstate["fromdatepicker"] != null &&             viewstate["todatepicker"] != null &&             viewstate["fromdatepicker"].tostring() != "" &&             viewstate["todatepicker"].tostring() != "")         {             timereportgrid.mastertableview.filterexpression += "(it.entrydate >= '" + viewstate["fromdatepicker"].tostring() + "') , (it.entrydate <= '" + viewstate["todatepicker"].tostring() + "')";         }

feel free ask if there problem

thanks , fast answer !

the answer question pretty simple had declared entrydateis datetime that

timereportgrid.mastertableview.filterexpression += "(it.entrydate>= datetime '" + viewstate["fromdatepicker"].tostring() + " 00:00') , (it.entrydate<= datetime '" + viewstate["todatepicker"].tostring() + " 23:59')";

simple take me time

feel free ask if there problems


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