where statement in linq to sql doesn't appear in the list

Question

I create a linq to sql in visual studio so i create a dbcontext object in my asp web form as you can see here :

 public AccidentCongress.dblinqtoDb.dbDataContext dbcontext = new dbDataContext();
        protected void BtnSend_Click1(object sender, EventArgs e)
        {
           if (dbcontext.tblUserInfos.??????)
        } 

I need to select a row in tblUserInfos with where clause but the where clause doesn't in the list why ?

Answer 1

Make sure you have a using System.Linq; statement towards the top of that file.

Answer 2

"Where" is an extension method which is declared in the System. Linq namespace, so make sure you add "using System.Linq;" to the using section at the top of the cs file.

Answer 3

添加对System.Linq引用或没有using语句