Условие поиска для запроса

while (read.Read())
                {
                    pos = CreatureSearchDGV.Rows.Add();
 
                    CreatureSearchDGV.Rows[pos].Cells["entry"].Value = Convert.ToString(read["entry"]);
                    CreatureSearchDGV.Rows[pos].Cells["CreatureGUID"].Value = Convert.ToString(read["guid"]);
                }

if (Convert.ToString(read["guid"]) == "") MessageBox.Show("Error");
else CreatureSearchDGV.Rows[pos].Cells["CreatureGUID"].Value = Convert.ToString(read["guid"]);

using (SqlDataReader sqlDataReader = await sqlCommand.ExecuteReaderAsync())
{
    while (await sqlDataReader.ReadAsync())
    {
        drawSpecifications.Add(new DrawSpecification
        {
            DrawSpecID = (int)sqlDataReader["ID_DrawSpec"],
            DrawSystemID = (int)sqlDataReader["ID_DrawSys"],
            DSPositionNum = (short)sqlDataReader["SpecPos"],
            DSKKS = sqlDataReader["KKS"] as string ?? "",
            DSDesignation = sqlDataReader["Oboznachenie"] as string ?? "",
            DSName = sqlDataReader["Naimenovanie"] as string ?? "",
            DSQuantity = sqlDataReader["Kolvo"] ==
                DBNull.Value ? null : (double?)sqlDataReader["Kolvo"],
            DSQuantityAssembly = sqlDataReader["KolvoIzg"] ==
                DBNull.Value ? null : (double?)sqlDataReader["KolvoIzg"],
            DSMeasure = sqlDataReader["EdIzm"] as string ?? "",
            DSMaterial = sqlDataReader["Material"] as string ?? "",
            DSUnitWeight = sqlDataReader["VesEd"] ==
                DBNull.Value ? null : (double?)sqlDataReader["VesEd"],
            DSWorkOrder = sqlDataReader["ID_NaryadZakaz"] ==
                DBNull.Value ? null : (int?)sqlDataReader["ID_NaryadZakaz"],
            DSWorkOrderAssembly = sqlDataReader["ID_NaryadZakazIzg"] ==
                DBNull.Value ? null : (int?)sqlDataReader["ID_NaryadZakazIzg"]
        });
    }
}