how to set the dropdown dependency in javascript using c#

Question

Hi This Mohan,

my javascript code is 

var states = new Array();

 states['science'] = new Array('Select', 'PCMB', 'PCMC');

 states['commerce'] = new Array('Select', 'SEBA','HEBA'); 

states['arts'] = new Array('Select', 'HEPS'); 

 function setStates()

 {

 cntrySel = document.getElementById('ddlbranch');

 stateList = states[cntrySel.value]; 

 changeSelect('ddlsubcategory', stateList, stateList);

 setCities();

 }

 function changeSelect(fieldID, newOptions, newValues) 

{

 selectField = document.getElementById(fieldID);

 selectField.options.length = 0;

 for (i = 0; i < newOptions.length; i++) 

{ 

 selectField.options[selectField.length] = new Option(newOptions[i], newValues[i]);

 }

 }

 function addLoadEvent(func)

 { 

 var oldonload = window.onload;

 if (typeof window.onload != 'function')

 { 

 window.onload = func; 

 }

 else

 {

 window.onload = function ()

 {

 if (oldonload)

 {

 oldonload();

 }

 func(); 

 }

 }

 }

 addLoadEvent(function () { setStates(); });

when i use this code it's working but not storing the Database

my C# code is

 obj.Combination = ddlsubcategory.Text;

ples help me how to solve this problem.