c# - Database to DropDownList and AutoPostBack to Label -

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i have code this

    protected void dropdownlist1_selectedindexchanged(object sender, eventargs e)             {                 string strconnectionstring = configurationmanager.connectionstrings["sqlservercstr"].connectionstring;                  sqlconnection myconnection = new sqlconnection(strconnectionstring);                 myconnection.open(); string musisim = dropdownlist1.selecteditem.value;                  sqlcommand cmd = new sqlcommand("select b.hesap_no  yaz..mardata.s_teklif b b.mus_k_isim = dropdownlist1.selecteditem.value", myconnection);                  label1.text = cmd.executereader().tostring();                  myconnection.close();

i have customer name "mus_k_isim" , number "hesap_no"

all want is, (autopostback true) automaticly getting label "hesap_no" has number "mus_k_isim" in dropdownlist.

how can that?

error: description: unhandled exception occurred during execution of current web request. please review stack trace more information error , originated in code.

your database doesn't know asp page or controls on ;-) you'll need re-work sql statement - first revision change thus:

sqlcommand cmd = new sqlcommand("select b.hesap_no  yaz..mardata.s_teklif b b.mus_k_isim = '" + dropdownlist1.selecteditem.value + "'", myconnection);

so name selected in dropdownlist added sql query.

looking ahead, best kind of thing either parameterized query or stored procedure.

hth.


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