.net Drop Down List OnSelectedIndexChange Event

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C#

ASP.NET

I have a drop down list that I'm trying to fire a redirect when the index changes. Technically all I want to do is refresh the page with the new selected value passed to the url. My drop down list is data bound with Account Names for Label and GUID's for Values from CRM 2011. My code behind pulls in form values based on the GUID passed through the url.

<asp:DropDownList runat="server" ID="RecordSelect" 
                            OnSelectedIndexChanged="SelectionChanged"
                            AutoPostBack="true" >

When debugging this function doesn't fire. The page refreshes, but the DDL goes back to the original index.

protected void SelectionChanged(object sender, EventArgs e)
        {
            Response.Redirect("http://url/account.aspx?field1=" + ((DropDownList)sender).SelectedValue);
        }

/edit
This is the code that populates the drop down called from Page_Load

protected void Load_Entity_Items(string entity_Name, string record_Name, string recordid)
        {
            using (OrganizationServiceProxy serviceProxy = new OrganizationServiceProxy(OrganizationUri, HomeRealmUri, getCred(), null))
            {
                serviceProxy.EnableProxyTypes();
                QueryExpression qe = new QueryExpression();
                qe.EntityName = entity_Name;
                qe.ColumnSet = new ColumnSet();
                qe.ColumnSet.Columns.Add(record_Name);
                qe.ColumnSet.Columns.Add(recordid);
                OrderExpression oe = new OrderExpression();
                oe.AttributeName = record_Name;
                oe.OrderType = OrderType.Ascending;
                qe.Orders.Add(oe);
                EntityCollection ec = serviceProxy.RetrieveMultiple(qe);

                List<picklistoptions> lst = new List<picklistoptions>();
                foreach (Entity act in ec.Entities)
                {
                    lst.Add(new PickListOptions() { 
                        ItemLabel = act[record_Name].ToString(), 
                        ItemValue = act[recordid].ToString() 
                    });
                    if (ec.Entities.IndexOf(act) == 24)
                            break;
                }
                RecordSelect.DataSource = lst;
                RecordSelect.DataTextField = "ItemLabel";
                RecordSelect.DataValueField = "ItemValue";
                RecordSelect.DataBind();
                RecordSelect.SelectedValue = _accountId.ToString();
            }
            
        }