c# - I want to show 2nd drp down value if 1st one is selected -


i have 2 issues:

1) want show values of 2nd drop down if first drop down value selected

2) want pass datafeild value of selected item in first drop down parameter 2nd drop down. (it throwing outofrange exception)

<div class="colmd-3 col-sm-3 col-xs-3 responsive-filterbar">     <asp:dropdownlist runat="server" id="drpcrhcompetencyname" clientidmode="static" cssclass="form-control" datatextfield="title" datavaluefield="responsibilityid"></asp:dropdownlist> </div> <div class="colmd-3 col-sm-3 col-xs-3 responsive-filterbar">     <asp:dropdownlist runat="server" id="drpcrhcompetencylevel" clientidmode="static" cssclass="form-control" datatextfield="level" datavaluefield="skilllevleid"></asp:dropdownlist> </div>   var competencyname = competencymanager.getsfiacompetencies(); drpcrhcompetencyname.datasource = competencyname; drpcrhcompetencyname.databind();  var competencylevel = competencymanager.getlevelbycompetency(drpcrhcompetencyname.selectedvalue); drpcrhcompetencylevel.datasource = competencylevel; drpcrhcompetencylevel.databind();

now getting error if put drpcrhcompetencyname.selectedvalue parameter. can suggest me right way please

you have check first if following line returns valid object used databinding:

var competencylevel = competencymanager.getlevelbycompetency(drpcrhcompetencyname.selectedvalue);

hope may help. best regards,


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