ASP.NET

I have 2 textboxes and a button. for texbox 1 i have used a handler for autocompletion from database. and using javascript on key pressing "enter" key the focus changes to textbox 2.. in textbox2 textchanged event i am checking a value in database corresponding to the values in textbox1.

so on post back the focus is set to textbox1. i want to be on button1.

$(document).ready(function() {
       $("#<%=textbox1.ClientID%>").autocomplete('../wholesalers/Handler.ashx');
   });


   $(function() {
       $('input:text:first').focus();
       var $inp = $('input:text');
       $inp.bind('keydown', function(e) {
           //var key = (e.keyCode ? e.keyCode : e.charCode);
           var key = e.which;
           if (key == 13) {
               e.preventDefault();
               var nxtIdx = $inp.index(this) + 1;
               $(":input:text:eq(" + nxtIdx + ")").focus();
           }
       });
   });

protected void Page_Load(object sender, EventArgs e)
    {
        lbl_Wname.Text = Request.QueryString["name"];
        if (!IsPostBack)
        {
            textbox1.Attributes.Add("onkeypress", "returnSetfocus(event,'" + textbox1.ClientID + "')");
        }
        else
        {
            button1.Focus();
        }
    }

protected void textbox2_TextChanged(object sender, EventArgs e)
   {
       if (textbox2.Text == "" || textbox2 == null)
{
           ScriptManager.RegisterStartupScript(this, GetType(), "error", "alert('Enter Quantity');", true);
       }
       else
       {


           MySqlConnection mcn = new MySqlConnection("server=localhost;---------------------");
           mcn.Open();
           MySqlCommand cmd = new MySqlCommand();
           cmd.CommandText = "searchp";
           cmd.CommandType = CommandType.StoredProcedure;
           cmd.Connection = mcn;
           cmd.Parameters.Add("p_product_name", MySqlDbType.VarChar).Value =textbox1.Text;
           DataTable dt = new DataTable();
           MySqlDataAdapter ada = new MySqlDataAdapter(cmd);
           ada.Fill(dt);
           if (dt.Rows.Count > 0)
           {
               string sts = dt.Rows[0]["status"].ToString();
               if (sts == "available")
               {
                   Image1.ImageUrl = "~/images/tick.gif";
               }
               if (sts == "not-available")
               {
                   Image1.ImageUrl = "~/images/cross.gif";
               }
           }
           button1.Focus();
       }
    }

<travel>
    <countries>
        <name>china</name>
        <name>india</name>
        <name>usa</name>
        <name>singapore</name>
    </countries>
</travel>

china, india, usa, and singapore

chinaindiausasingapore,

<dxe:ASPxComboBox ID="cmbmMicroCause" Width="100%" runat="server" DataSourceID="RootCauseMicroDataSource"
                                                        TextField="name" ValueField="code" ClientInstanceName="cmbmMicroCause"
                                                        AutoPostBack="false" >
                                                        <ClientSideEvents SelectedIndexChanged="function(s,e){OncmbMicroCauseChanged(s);}" />
                                                    </dxe:ASPxComboBox>

OncmbMicroCauseChanged()

saveBusinessExpections()