Data Controls :: Filter Records In DataList Using DropDownList

I have jquery menu in index.aspx  page when user click on item related to that item it go to House.aspx and show products information in datalist these are my table in DB:

1-House_info Table

Id Behcode Name Region H_name

1 1111 Jack 1 Cloth
2 2222 Ana 1 Electric
3 3333 Edvard 2 Electric
4 4444 Math 1 Furniture

2-House_product Table

Id Behcode Name Description H_name

1 2222 Iron Test Electric
2 4444 Sofa Test Furniture
3 1111 Scarf Test Cloth
4 3333 Laundry Test Electric

And these are my code in index.aspx   and House.aspx

Index.aspx:

<ul><li>
<a href="house .aspx?H_name=Electric">Electric</a>
<ul>
<li class="current"><a href="house .aspx?H_name=Furniture>Sofa</a></li>
 
2-House_aspx

string Code = Request.QueryString["H_name"];
SqlCommand _cmd = new SqlCommand("select * from House_p where H_name=@H_name", _cn);
_cmd.Parameters.AddWithValue("@H_name", Code);
_cn.Open();
SqlDataReader _dr = _cmd.ExecuteReader();

[Code] ...

EX : In index.aspx When user click on Electric item it go to house.aspx and show all product that have H_name=Electric According to House_p table it will show :

Id Behcode Name Description H_name

1 2222 Iron Test Electric
4 3333 Laundry Test Electric

Now I have one  DDL and 1 button in House.aspx page I want when user click on menu and go to house.aspx page after they see result of their selected item from menu choose their region from ddl and click on button after that they see product that are in that region according to table House_info

 EX : If user select region 1 it will show all Electric product that have region=1

Id Behcode Name Description H_name

1 2222 Iron Test Electric