c# - Null reference using Linq to Xml -


i making country, state dropdownlist.

for eg: particular country, read states of country xml file below code

protected void dropdownlist1_selectedindexchanged(object sender, eventargs e)     {          string  st = (dropdownlist1.selectedindex).tostring();           xdocument main = xdocument.load((server.mappath(@"xmlfile1.xml")));       var query = user in main.descendants("country")             st == user.element("state").value --//i getting error here object              select user;                                reference not set instance object      dropdownlist2.datasource = query;     dropdownlist2.databind();         }

op's xml (link provided in chuck's comments) : bind dropdownlist using xml

if using namespace in xml file following might you.:

xnamespace ns = "url";// url namespace path namespace var query = user in main.descendants("country")             state in user.elements("state")             state.value == "st"             select user;

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