ajax autocomplete extender problem

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C#

ASP.NET

Ajax

hi
i am using ajax autocomplete extender for outo fill my textboxe .

look here

public string[] ReturnItem(string prefixText)
{
  string str1 = 'select Item from SCM_BalPo where Item LIKE ' + prefixText + '%';
  ds1 = objDl.returnDataSet(str1, 'Item');
  items1 = new string[ds1.Tables['Item'].Rows.Count];
  for (int i = 0; i < ds1.Tables[0].Rows.Count; i++)
  {
	  items1[i] = ds1.Tables[0].Rows[i].ItemArray[0].ToString();
  }
  return items1;
}
[WebMethod]
public string[] ReturnSiteId(string prefixText1)
{
  string str = 'select SiteId from SA_Client where SiteId LIKE ' + prefixText1 +'%';
  ds = objDl.returnDataSet(str, 'SiteID');
  items = new string[ds.Tables['SiteID'].Rows.Count];
  for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
  {
	   items[i] = ds.Tables[0].Rows[i].ItemArray[0].ToString();
  }
  return items;
}

in above i have two methods are ReturnItem,ReturnSiteId for filling two textboxs

ReturnSiteId method not working i cant find where is problem please help me if i put ReturnSiteId at starting position in code it will working fine but that time ReturnItem method is not working

simply , only one method working at a time which is put frist in mycode