c# - catching exception. error using stored procedure -


i have been working on web application project , while changing sql commands stored procedures security, code started catching exception. tried placing debug point on catch statement , shows

"index outside bounds of array."

i don't know how solve this.

try {     string tw1 = textboxtowerno.text;     landview.activeviewindex = 0;     int aninteger = convert.toint32(textboxtowerno.text);     int aninteger1 = aninteger - 1;     int aninteger2 = aninteger + 1;     lbltowerno.text = tw1;      string connetionstring = system.configuration.configurationmanager                                    .connectionstrings["constr"].connectionstring; ;     sqlconnection cnn = new sqlconnection(connetionstring);     string sql = "usp_select_tower_data";                  cnn.open();     sqlcommand command = new sqlcommand(sql, cnn);     command.commandtype = commandtype.storedprocedure;     command.parameters.add("@tower", sqldbtype.nvarchar, 50,"username").value = tw1;     sqldatareader datareader = command.executereader();      if (datareader.hasrows)     {         while (datareader.read())         {             tower.text = datareader.getvalue(0).tostring();             latitude.text = datareader.getvalue(1).tostring();             longitude.text = datareader.getvalue(2).tostring();             survey.text = datareader.getvalue(3).tostring();             police.text = datareader.getvalue(7).tostring();             agri.text = datareader.getvalue(8).tostring();             village.text = datareader.getvalue(4).tostring();             taluka.text = datareader.getvalue(5).tostring();             district.text = datareader.getvalue(6).tostring();             hiddenlatt.value = datareader.getvalue(1).tostring();             hiddenlongi.value = datareader.getvalue(2).tostring();         }     }     else     {         scriptmanager.registerclientscriptblock(this, this.gettype(),              "alertmessage", "alert('please enter correct tower number')", true);         landview.activeviewindex = -1;     }         } catch (exception ex) {     scriptmanager.registerclientscriptblock(this, this.gettype(),          "alertmessage", "alert('error while getting data ')", true);     landview.activeviewindex = -1; }


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