Insert master and details data into database using linq to SQL

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I have two tables, one for purchase master data e.g purchaseid, date, supplierId, bill amount, and the other one is Purchase_details table which contains purchaseID (ref of master table purchaseid) productid, qty, rate and amount.
Master table has purchaseid as primary key but details table nothing as primary key. PurchaseId may be repeat as per ordered products.

In linq to sql how i can save Details data without primary key.
I m new to linq to sql so detailed answer is more helpfull for me.
Please note, i have issue to save details data only due to no primary key.
Programming language is C#

What I have tried:

Waiting for response by codeproject members.

Posted 12-Feb-21 8:35am

Ghayyas Awan

Updated 12-Feb-21 9:12am

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[no name] 12-Feb-21 14:46pm

ماهي sql

A-B-N Syria

[no name] 12-Feb-21 14:46pm

ماهي sql

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RickZeeland · Accepted Answer · 2021-02-12T09:12:00

Here is a code first example: LinqToSql code-first | LinqToSql Tutorial and Documentation[^]

Microsoft simple examples: What You Can Do With LINQ to SQL - ADO.NET | Microsoft Docs[^]

And here is a more elaborate CodeProject tutorial, see the part about the DataContext object:
LINQ to SQL: Basic Concepts and Features[^]
and the examples about updating / inserting records:

// update one product
Product bev1 = beverages.ElementAtOrDefault(10);
if (bev1 != null)
{
    Console.WriteLine("The price of {0} is {1}. Update to 20.0", 
                      bev1.ProductName, bev1.UnitPrice);
    bev1.UnitPrice = (decimal)20.00;
}
// submit the change to database
db.SubmitChanges();

Product newProduct = new Product {ProductName="new test product" };
db.Products.InsertOnSubmit(newProduct);
db.SubmitChanges();