How to use Multiple Dropdown in Usercontrol

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ASP.NET

Hi all

Pls Guide me how to use multiple drop down selected index changed event in user control

Here i have 3 drop down inside the user control

I used a code like

protected void ddlCustomerGroup_SelectedIndexChanged(object sender, EventArgs e)
{
    customer();
}

 public class SelectedIndexChangedEventArgs : EventArgs
    {
    }

How to include the second drop down selected index changed

I done the code like

protected void ddlCustomer_SelectedIndexChanged(object sender, EventArgs e)
       {
           customer();
       }

But i found dis message as error

Compiler Error Message: CS1061: 'ASP.custgrpprodcatproduct_ascx' does not contain a definition for 'ddlCustomer_SelectedIndexChanged' and no extension method 'ddlCustomer_SelectedIndexChanged' accepting a first argument of type 'ASP.custgrpprodcatproduct_ascx' could be found (are you missing a using directive or an assembly reference?)


pls Guide me to fix dis issue..