c# - Error with second dropdownlist in DataList -

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i have datalist have 2 dropdowns: first select table , second select column. far good.

the problem starts when go next item in datalist , make selection on dropdownlist "ddltable". after doing this, second dropdownlist of previous changes value first possible item. can me out? how can stop doing this?

here code:

protected void page_load(object sender, eventargs e) {     try     {         scriptmanager scriptmanager = scriptmanager.getcurrent(this.page);         if (!scriptmanager.isinasyncpostback && !ispostback)         {             datalist_load(datalistitems);         }     }     catch (exception ex)     {         throw ex;     } }  protected void datalist_load(int itens) {     try     {         list<int> mylist = new list<int>();         (int = 0; < itens; i++)             mylist.add(i);          dlquery.datasource = mylist;         dlquery.databind();      }     catch (exception ex)     {         throw ex;     } }  protected void dlquery_itemdatabound(object sender, datalistitemeventargs e) {     try     {         if (e.item.itemtype == listitemtype.item || e.item.itemtype == listitemtype.alternatingitem)         {             var ddl = e.item.findcontrol("ddltable") dropdownlist;             ddltable_load(ddl);         }     }     catch (exception ex)     {         throw ex;     } }  protected void ddltable_load(dropdownlist ddl) {     try     {         connection cn = new connection();         sqlconnection sqlconn = cn.sqllocalconn;         sqlcommand sqlcmd = new sqlcommand("stp_portal_globalmgmtqueryitens", sqlconn);         sqlcmd.commandtype = system.data.commandtype.storedprocedure;          ddl.datasource = cn.executesqlcmd(sqlconn, sqlcmd);         ddl.datatextfield = "name";         ddl.datavaluefield = "id";         ddl.databind();         ddl.items.insert(0, "select one");     }     catch (exception ex)     {         throw ex;     } }  protected void ddltable_selectedindexchanged(object sender, eventargs e) {     try     {         dropdownlist ddl1 = sender dropdownlist;         if (ddl1.selectedindex > 0)         {             //string aux = ddl1.uniqueid;             dropdownlist ddl2 = (dropdownlist)ddl1.parent.findcontrol("ddlcolumn");             //string aux2 = ddl2.uniqueid;             ddlcolumn_load(ddl2, ddl1.selectedvalue);         }     }     catch (exception ex)     {         throw ex;     } }  protected void ddlcolumn_load(dropdownlist ddl, string val) {     try     {         connection cn = new connection();         sqlconnection sqlconn = cn.sqllocalconn;         sqlcommand sqlcmd = new sqlcommand("stp_portal_globalmgmtqueryitemcolumns", sqlconn);         sqlcmd.commandtype = system.data.commandtype.storedprocedure;         sqlcmd.parameters.add("@inttableid", sqldbtype.int).value = val;          ddl.datasource = cn.executesqlcmd(sqlconn, sqlcmd);         ddl.datatextfield = "name";         ddl.datavaluefield = "id";         ddl.databind();          ddl.items.insert(0, "select one");    }    catch (exception ex)    {         throw ex;    } }  protected void ddlcolumn_selectedindexchanged(object sender, eventargs e) {     try     {         dropdownlist ddl = sender dropdownlist;         if (ddl.selectedindex > 0)         {             //just test         }     }     catch (exception ex)     {         throw ex;     } }

aspx

<asp:datalist id="dlquery" runat="server" repeatcolumns="3" repeatdirection="horizontal"     enableviewstate="true" onitemdatabound="dlquery_itemdatabound">     <itemtemplate>         <table>             <tr>                 <td align="right" style="height: 20px">                     <asp:label id="lbltable" runat="server" font-bold="true" font-names="verdana" font-size="7pt"                         text="table" forecolor="#005780"></asp:label>                 </td>                 <td align="left">                     <asp:dropdownlist id="ddltable" runat="server" autopostback="true" font-names="verdana"                         font-size="7pt" onselectedindexchanged="ddltable_selectedindexchanged">                     </asp:dropdownlist>                 </td>             </tr>             <tr>                 <td align="right" style="height: 20px">                     <asp:label id="lblcolumn" runat="server" font-bold="true" font-names="verdana" font-size="7pt"                         text="column" forecolor="#005780"></asp:label>                 </td>                 <td align="left">                     <asp:dropdownlist id="ddlcolumn" runat="server" font-names="verdana" font-size="7pt"                         autopostback="true" onselectedindexchanged="ddlcolumn_selectedindexchanged">                     </asp:dropdownlist>                 </td>             </tr>             <tr>                 <td align="right" style="height: 20px">                     <asp:label id="lbltoshow" runat="server" font-bold="true" font-names="verdana" font-size="7pt"                         text="to show" forecolor="#005780"></asp:label>                 </td>                 <td align="left">                     <asp:checkbox id="cbtoshow" runat="server" font-names="verdana" font-size="7pt" />                 </td>                 <tr>                     <td align="right" style="height: 20px">                         <asp:label id="lblcrit" runat="server" font-bold="true" font-names="verdana" font-size="7pt"                             forecolor="#005780" text="criteria"></asp:label>                     </td>                     <td align="left">                         <asp:textbox id="txtcrit" runat="server" font-names="verdana" font-size="7pt" width="95%"></asp:textbox>                     </td>                 </tr>                 <tr>                     <td align="right" style="height: 20px">                         <asp:label id="lblor" runat="server" font-bold="true" font-names="verdana" font-size="7pt"                             forecolor="#005780" text="or"></asp:label>                     </td>                     <td align="left">                         <asp:textbox id="txtor" runat="server" font-names="verdana" font-size="7pt" width="95%"></asp:textbox>                     </td>                 </tr>             </tr>         </table>     </itemtemplate>     <separatortemplate>         <table>             <tr>                 <td align="right" style="width: 20px">                 </td>             </tr>             <tr>                 <td align="right" style="width: 20px">                 </td>             </tr>             <tr>                 <td align="right" style="width: 20px">                 </td>             </tr>             <tr>                 <td align="right" style="width: 20px">                 </td>             </tr>             <tr>                 <td align="right" style="width: 20px">                 </td>             </tr>         </table>     </separatortemplate> </asp:datalist>


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