OdbcConnection cn = new OdbcConnection("DSN=Testgdb;UID=SYSDBA;PWD=masterkey;");
        try
        {
            //写入BLOB字段
            byte[] myBlob = System.Text.Encoding.UTF8.GetBytes(TextBoxDetails.Text);
            string myString = string.Format("update customer set SUMMARY= (@summary) where CUSTID='{0}'  and SNAME='{1}'",TextBoxNo.Text , TextBoxCorp.Text);
            cn.Open();
            OdbcCommand cmd = new OdbcCommand(myString, cn);
            cmd.Parameters.Add("@summary", SqlDbType.Image).Value = myData;

            Response.Write(myString);
            cmd.ExecuteNonQuery();
        }
        catch (OdbcException ex)
        { Response.Write(ex.Message); }
        finally
        { cn.Close(); }