combo box load event

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ASP.NET

I write this in page load
cmbBatchno.Load += new EventHandler(cmbBatchno_Load(object sender,EventArgs e))

and
this is the event i write but its not working.. pls help me....

void cmbBatchno_Load(object sender, EventArgs e)
   {
       if (ViewState["BatchNo"] != null)
       {
           DataTable dtBatchNoDtls = (DataTable)ViewState["BatchNo"];
           for (int i = 0; i < dtBatchNoDtls.Rows.Count; i++)
           {
               if (cmbBatchno.Text == dtBatchNoDtls.Rows[i]["BatchNo"].ToString())
               {
                   txtExpdate.Enabled = false;
                   txtMRP.Enabled = false;
                   break;
               }
               else
               {
                   txtExpdate.Enabled = true;
                   txtMRP.Enabled = true;
                   txtExpdate.Text = string.Empty;
                   txtMRP.Text = "";
                   txtRate.Text = "";
               }
           }

       }


   }