Question

I have a table PromotionRequest with 4 columns:

| PromoId | PromoType 
----------------------
|   101   |  1   |  
|   101   | 2    |  
|   103   | 3    |  
|   104   | 4    |  

I have a table PromotionResponsek with 4 columns(PromoId,PromoType ,Value,PromoDesc) one of which is PromoId

I have to find all the rows in PromotionResponse whose PromoId value matches with PromoId value of PromotionRequest Table.

Answer 1

var matched = from table1 in PromotionRequest.AsEnumerable()
               join table2 in PromotionResponse .AsEnumerable() on
               table1.Field<string>("PromoId ") equals table2.Field<string>("PromoId ")
               where table1.Field<string>("PromoId ") == table2.Field<string>("PromoId ")
               select table2;
if (matched.Any())
 {
 }