怎么给byte[]赋空值
我是这样写的但是不行
if (this.DGV_SQ.Rows[i].Cells["IDimg"].Value != DBNull.Value)
                   {
                       model.IDimg = (byte[])DGV_SQ.Rows[i].Cells["IDimg"].Value;
                   }
                   else
                   {
                       model.IDimg = DBNull.Value;
                   }