asp.net - radgrid data disappear after filtering -

i using radgrid show data , have set allowfilteringbycolumn true, when try filter rows, postback occurs , radgrid content disappears (all things disappear , border remains).

<telerik:radajaxpanel id="pnlshowgrid" runat="server" loadingpanelid="radajaxloadingpanel4">                        <div class="row-fluid">         <telerik:radgrid id="radgrid1" runat="server"             cssclass="radgrid" height="400px"             clientsettings-selecting-allowrowselect="true"             allowpaging="true" pagesize="20" allowsorting="true"             autogeneratecolumns="false" allowautomaticupdates="true"             showstatusbar="true" allowautomaticdeletes="true"             allowfilteringbycolumn="true"             width="100%"             onupdatecommand="radgrid1_updatecommand"             onitemdeleted="rgrd_edit_itemdeleted"             onitemcommand="radgrid1_itemcommand">              <exportsettings exportonlydata="true">                 <pdf defaultfontfamily="arial unicode ms" fonttype="embed" />                 <excel autofitimages="true" />             </exportsettings>             <filtermenu enableimagesprites="true">             </filtermenu>             <exportsettings exportonlydata="true" openinnewwindow="true">                 <excel format="excelml"></excel>                 <excel autofitimages="true" />                 <pdf fonttype="embed" allowprinting="true" />                 <pdf defaultfontfamily="arial unicode ms" />             </exportsettings>             <clientsettings allowgroupexpandcollapse="true" selecting-allowrowselect="true">                 <selecting allowrowselect="true" />             </clientsettings>             <mastertableview                 commanditemdisplay="topandbottom" dir="rtl" allowfilteringbycolumn="true"                 datakeynames="accesspesrmission_id"                 nodetailrecordstext="??? ?????? ???? ????? !"                 nomasterrecordstext="??? ?????? ???? ????? !">             <commanditemsettings exporttopdftext="export pdf" addnewrecordtext="????? ????? ????" showaddnewrecordbutton="false" refreshtext="?????????" showexporttoexcelbutton="true" showexporttowordbutton="true" showexporttopdfbutton="false">             </commanditemsettings>                 <rowindicatorcolumn filtercontrolalttext="filter rowindicator column" filtercontrolwidth="20%"></rowindicatorcolumn>             <expandcollapsecolumn visible="true" filtercontrolalttext="filter expandcolumn column" filtercontrolwidth="20%"></expandcollapsecolumn>                 <columns>                     <telerik:gridboundcolumn display="false" filtercontrolwidth="10px" datafield="accesspesrmission_id" datatype="system.int32" filtercontrolalttext="filter accesspesrmission_id column" headertext="?????" sortexpression="accesspesrmission_id" uniquename="accesspesrmission_id" andcurrentfilterfunction="contains" autopostbackonfilter="true" currentfilterfunction="contains">                     </telerik:gridboundcolumn>                     <telerik:gridcheckboxcolumn datafield="accesspermission_read" datatype="system.boolean" filtercontrolalttext="filter accesspermission_read column" headertext="?????" sortexpression="accesspermission_read" uniquename="accesspermission_read" andcurrentfilterfunction="contains" autopostbackonfilter="true" currentfilterfunction="contains">                     </telerik:gridcheckboxcolumn>                     <telerik:gridcheckboxcolumn datafield="accesspermission_add" datatype="system.boolean" filtercontrolalttext="filter accesspermission_add column" headertext="???" sortexpression="accesspermission_add" uniquename="accesspermission_add">                     </telerik:gridcheckboxcolumn>                     <telerik:gridcheckboxcolumn datafield="accesspermission_edit" datatype="system.boolean" filtercontrolalttext="filter accesspermission_edit column" headertext="??????" sortexpression="accesspermission_edit" uniquename="accesspermission_edit">                     </telerik:gridcheckboxcolumn>                     <telerik:gridcheckboxcolumn datafield="accesspermission_delete" datatype="system.boolean" filtercontrolalttext="filter accesspermission_delete column" headertext="???" sortexpression="accesspermission_delete" uniquename="accesspermission_delete">                     </telerik:gridcheckboxcolumn>                     <telerik:gridboundcolumn display="false" filtercontrolwidth="10px" datafield="accesspesrmission_sathesazmani_id" filtercontrolalttext="filter accesspesrmission_sathesazmani_id column" headertext="????? ??? ???????" sortexpression="accesspesrmission_sathesazmani_id" uniquename="accesspesrmission_sathesazmani_id" andcurrentfilterfunction="contains" autopostbackonfilter="true" currentfilterfunction="contains">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="40px" datafield="vahedsazmani_farsiname" filtercontrolalttext="filter vahedsazmani_farsiname column" headertext="???? ???????" sortexpression="vahedsazmani_farsiname" uniquename="vahedsazmani_farsiname">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="40px" datafield="semat_name" filtercontrolalttext="filter semat_name column" headertext="???" sortexpression="semat_name" uniquename="semat_name">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="40px" datafield="groohekarmandi_namefarsi" filtercontrolalttext="filter groohekarmandi_namefarsi column" headertext="???? ???????" sortexpression="groohekarmandi_namefarsi" uniquename="groohekarmandi_namefarsi">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="40px" datafield="personel_namekamel" filtercontrolalttext="filter personel_namekamel column" headertext="?????" sortexpression="personel_namekamel" uniquename="personel_namekamel">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="40px" datafield="com_name" filtercontrolalttext="filter com_name column" headertext="????" sortexpression="com_name" uniquename="com_name">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="70px" datafield="source_desc" filtercontrolalttext="filter source_desc column" headertext="????" sortexpression="source_desc" uniquename="source_desc">                     </telerik:gridboundcolumn>                     <telerik:gridboundcolumn filtercontrolwidth="20px" datafield="sourcetype_desc" filtercontrolalttext="filter sourcetype_desc column" headertext="??? ????" sortexpression="sourcetype_desc" uniquename="sourcetype_desc">                     </telerik:gridboundcolumn>                     <telerik:gridbuttoncolumn commandname="delete" buttontype="imagebutton" text="???"                         uniquename="columndelete" confirmtext="??? ?? ?????? ????? ???? ??? ?? ??? ???? ?"                         confirmdialogtype="radwindow" imageurl="../../assets/img/icon/del-layer.png"                         confirmdialogheight="180" confirmdialogwidth="380" footerstyle-width="60px"                         headerstyle-width="60px" itemstyle-width="60px">                     </telerik:gridbuttoncolumn>                     <telerik:gridbuttoncolumn commandname="edit" andcurrentfilterfunction="contains"                         buttontype="imagebutton" imageurl="../../assets/img/icon/edit.png"                         autopostbackonfilter="true" currentfilterfunction="contains" text="??????"                         footerstyle-width="60px" headerstyle-width="60px" itemstyle-width="60px"                         uniquename="columnedit">                     </telerik:gridbuttoncolumn>                                                    </columns>                  <editformsettings insertcaption="????? ????? ????" captionformatstring="?????? ???? ?? ?? : {0}"                     captiondatafield="com_id" editformtype="template" popupsettings-modal="true" formtablestyle-horizontalalign="center" formcaptionstyle-horizontalalign="center" popupsettings-closebuttontooltip="????" usercontrolname="popupform" popupsettings-width="800">                     <editcolumn uniquename="editcommandcolumn1" filtercontrolalttext="filter editcommandcolumn1 column"></editcolumn>                     <formtablestyle horizontalalign="center"></formtablestyle>                     <formcaptionstyle horizontalalign="center"></formcaptionstyle>                     <formtemplate>                     </formtemplate>                     <popupsettings modal="true" width="800px" closebuttontooltip="????"></popupsettings>                 </editformsettings>                  <pagerstyle pagesizecontroltype="radcombobox"></pagerstyle>             </mastertableview>             <pagerstyle pagesizecontroltype="radcombobox" />         </telerik:radgrid>     </div>     <asp:sqldatasource id="sqldatasource_grid" runat="server" connectionstring="<%$ connectionstrings:pigisconnectionstring %>">         <selectparameters>             <asp:controlparameter controlid="ddlcompany" name="com_id" propertyname="selectedvalue" type="string" />             <asp:controlparameter controlid="ddlvahedsazmani" name="vahedsazmani_id" propertyname="selectedvalue" type="string" />         </selectparameters>     </asp:sqldatasource> </telerik:radajaxpanel> 

i load data radgrid below function. (i call function in page load)

void loaddata() {     sqldatasource_grid.selectparameters.clear();     sqldatasource_grid.selectcommand = "spsct_select_from_sct_accesspermission";      sqldatasource_grid.databind();     radgrid1.datasource = sqldatasource_grid;     radgrid1.rebind(); } 

please add needdatasource event in radgrid.

<telerik:radgrid runat="server" id="radgrid1" onneeddatasource="radgrid1_needdatasource"> </telerik:radgrid> 

your c# code:

protected void radgrid1_needdatasource(object sender, telerik.web.ui.gridneeddatasourceeventargs e) {        sqldatasource_grid.selectparameters.clear();     sqldatasource_grid.selectcommand = "spsct_select_from_sct_accesspermission";      sqldatasource_grid.databind();     radgrid1.datasource = sqldatasource_grid; } 

it automatically rebind/databind radgrid whenever needed. please check below link more information. commands invoke rebind() implicitly