c# - Asp:Label that determined by dropdownlistbox not working properly -


this working other day, not sure happened isn't , cant figure out. label give me 1 item out of around 20(give or take) distinct items. no matter select in drop down list, gives me same value on label.

html:

                    <td>                     <asp:dropdownlist id="ddlcompanycode" runat="server" cssclass="dropdown" autopostback="true" onselectedindexchanged="ddlcompanycode_selectedindexchanged" width="139px" datasourceid="companycodeds" datatextfield="companycode" datavaluefield="companycode"></asp:dropdownlist>                     <asp:requiredfieldvalidator id="requiredfieldvalidator2" runat="server" controltovalidate="ddlcompanycode" display="dynamic" errormessage="*please select drop down list item." forecolor="#cc0000" validationgroup="submit"></asp:requiredfieldvalidator>                 </td>                 <td>                     <asp:label id="lblsourcesyst" runat="server" cssclass="txtlabel" text="select company code" width="137px" ></asp:label>                 </td>     <asp:sqldatasource id="companycodeds" runat="server" selectcommandtype="storedprocedure" connectionstring="<%$ connectionstrings:rptdatamartconnectionstring %>" selectcommand="[axmap].[selectcompanycode_glsourcecoa]">     </asp:sqldatasource>

c#:

        protected void page_load(object sender, eventargs e)     {         if (!ispostback)         {             ddlcompanycode.items.add(new listitem("--please select--", ""));             ddlcompanycode.appenddatabounditems = true;         }     }      protected void ddlcompanycode_selectedindexchanged(object sender, eventargs e)     {         string connectionstring = configurationmanager.connectionstrings["rptdatamartconnectionstring"].connectionstring;         string sqlstoredproc = "rptdatamart.axmap.selectcompanycode_glsourcecoa";         sqlconnection con = new sqlconnection(connectionstring);         sqlcommand cmd = new sqlcommand();         cmd.parameters.addwithvalue("@companycode", ddlcompanycode.selecteditem.value);         cmd.commandtype = commandtype.storedprocedure;         cmd.commandtext = sqlstoredproc;         cmd.connection = con;         try         {             con.open();             sqldatareader datareader = cmd.executereader();             while (datareader.read())             {                 lblsourcesyst.text = datareader["sourcesystem"].tostring();             }         }         catch (exception ex)         {             lblstatus.text = ex.message;         }     }

and stored procedure im trying use...

alter procedure [axmap].[selectcompanycode_glsourcecoa]  @companycode varchar(10) = null, @sourcesystem nvarchar(255) = null  begin set nocount off;  select distinct companycode, sourcesystem [rptdatamart].[axmap].[glsourcecoa]  end

my sql might terribly off, think work.

lblsourcesyst.text = datareader["sourcesystem"].tostring();

should be:

lblsourcesyst.text += datareader["sourcesystem"].tostring();

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