I have the following dropdown control:

<asp:DropDownList ID="ExecutiveID" runat="server" AutoPostBack="True">

I would like to set the OnSelectedIndexChanged if a querystring is present.  Here is my code: 

protected void Page_Load(object sender, EventArgs e)
{
    ObjectDataSource1.SelectParameters.Clear();

    if (Request.QueryString["ExecutiveID"] != "" && Request.QueryString["ExecutiveID"] != null)
    {
        ObjectDataSource1.SelectParameters.Add(new QueryStringParameter("ExecutiveID", TypeCode.Int32, "ExecutiveID"));
        ExecutiveID.OnSelectedIndexChanged = "ExecutiveID_SelectedIndexChanged";
    }
}

protected void ExecutiveID_SelectedIndexChanged(object sender, EventArgs e)
{
    Response.Redirect("executives.aspx?executiveid=" + ExecutiveID.SelectedValue);
}

It seems as though however I cannot the OnSelectedIndexChanged.  I receive the following error when trying to build:

Error	1	'System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(System.EventArgs)' is inaccessible due to its protection level
 

Any help on this would be most appreciated.

Thanks 

Well, obviously in this case you should parse the value of the ExecutiveID in the ExecutiveID_SelectedIndexChanged event handler:

protected void ExecutiveID_SelectedIndexChanged(object sender, EventArgs e)
{
     if (ExecutiveID.SelectedIndex >= 0)
         Response.Redirect("executives.aspx?executiveid=" + ExecutiveID.SelectedValue);
}

You don't need to assign the event handler if the query string parameter was not passed.

Andrey.

Hello beduenski,

You have to attach the event handler to the event of the dropdownlist, like:

Executive_ID.SelectedIndexChanged += new EventHandler(ExecutiveID_SelectedIndexChanged)

This can be done in the page_load method, but also on the webpage in the event definition part of the execute control.

Jeroen Molenaar.