[Solved] Radcombobox Validations for selecting Exisitng values in the Item collection

[jaladi]

hi

I have been working with this from past one week,but i am unable to validate the radcombobox 

Acutally,

Binding the values from the dataset like the below

 public DataSet GetZipValue(string str)
        {
            StringBuilder sb = new StringBuilder();
            DataSet ds = new DataSet();
            try
            {
                sb.Append("EXEC Spzip @zip='");
                sb.Append(str);
                sb.Append("'");
                ds = LoginParams.GetSQL(sb.ToString(), login.ConnectionString(), "zip", CommandTimeOut);

            }
            catch (Exception ex)
            {
             
            }
            finally
            {
                sb = null;
            }
            return ds;
        }

        protected void radZipCode_ItemDataBound(object sender, RadComboBoxItemEventArgs e)
        {
            try
            {
                e.Item.Text = ((DataRowView)e.Item.DataItem)["Zip"].ToString();
                e.Item.Value = ((DataRowView)e.Item.DataItem)["City"].ToString();

                e.Item.Attributes["Zip"] = ((DataRowView)e.Item.DataItem)["Zip"].ToString();
                e.Item.Attributes["City"] = ((DataRowView)e.Item.DataItem)["City"].ToString();
                e.Item.Attributes["State"] = ((DataRowView)e.Item.DataItem)["State"].ToString();
               
            }
            catch (Exception ex)
            {
           
            }
        }

        protected void radZipCode_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)
        {

            try
            {
                if (e.Text.Length > 1)
                {
                    RadComboBox combo = (RadComboBox)o;
                    DataSet ds = new DataSet();
                    ds = GetZipValue(e.Text);
                    combo.DataSource = ds.Tables[0];
                    combo.DataBind();
                }

            }
            catch (Exception ex)
            {
             
            }
        }
    }


Problem is :

how to validate the radcombobox that the selected item (after the obclientblur event)is matched with the DATASETgetting from backend..?

if it is matched the value is TRUE

other wise false value returns...