解决方法:
一:if (!System.Convert.IsDBNull(oGrnItemTable.Rows[i]["desc_e"]))
                   oItemRow.desc_e = oGrnItemRow.desc_e;
二:if(oGrnItemTable.Rows[i]["desc_e"]!=DBull.Value)
                     oItemRow.desc_e = oGrnItemRow.desc_e;
三: txtCurNo.Text = oGrnRow.cur_no is System.DBNull?"":(string)oGrnRow.cur_no;

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