Question

I’m trying to do the next thing: i have the next code on c#:

b.Text = myDataContext.purchases.Count().ToString();

I have page for example: items.aspx?nID=144

How can i can I construct a linq query which will take the querystring parameter and check the value from the items table by the id (nID) that show on the address?

The table have the design for example: id, title, bla, main.

Answer 1

By Lambda expressions:

int nID;
string qs = QueryString["nID"];
if (Int32.TryParse(qs, nID)
    myDataContext.purchases.Where(p => p.id == nID);
    // Other options if nID is a primary key
    //myDataContext.purchases.FirstOrDefault(p => p.id == nID);
    //myDataContext.purchases.SingleOrDefault(p => p.id == nID);

By LINQ query:

int nID;
string qs = QueryString["nID"];
if (Int32.TryParse(qs, nID)
    var purchase = from p in myDataContext.purchases
        where p.id == nID
        select p;