Question

Possible Duplicate:
Populate one dropdown based on selection in another

I have 3 Dropdown list on my aspx page. First one is hard coded with 4 values. The second one should be populated programatically, for ex. if I select “Product1” in first dropdown, then second dropdown should be populated with values like “Model1_1”, “Model1_2”. If I select “Product2” then the second dropdown is populated with “Model2_1”, “Model2_2”).

Could you give me some help ?

Answer 1

1 Set AutoPostBack="true" on first DropDownList1 and add OnSelectIndexChanged="YourDelegate".

2 In your delegate when you post data, bind your second DropDownList2 with prefix SelectedValue

 protected void DropDownList_SelectedIndexChanged(object sender, EventArgs e)
 {
   var value =  DropDownList1.SelectedValue;
   if(value == "Product1")
   { 
    ....      
   }
   else if(value == "Product2")
   { 
    ....      
   }
 }