Question

I’ve a datatable that has been filled by excel sheet, it has lots of product id’s and some other data. I want to check if there is any duplicate product id in my datatable and tell user that these prodcuts ids are duplicates or something like that.

Lmbda, Linq , Looping anything will do.

Thanks

Answer 1

Here’s a slightly modified version of another answer C# Linq finding duplicate row:

var qry =  from p in Products
           group p by p.productID into grp
           where grp.Count() > 1
           select grp;

foreach (var product in qry)
{
    // Do something as needed/desired
}

Products is the DataTable, productID is the product ID; substitute appropriate names from your code as needed. I haven’t tested this, but it should at least get you pointed in the right direction.