if(headData.EDIREMARK.IndexOf("PLEASE BOOK OCEAN CARRIER")>-1||headData.EDIREMARK.ToString().Trim()=="")
if(!string.IsNullOrWhiteSpace(headData.EDIREMARK)&&(headData.EDIREMARK.IndexOf("PLEASE BOOK OCEAN CARRIER")>-1||headData.EDIREMARK.ToString().Trim()==""))