Give me a suggestion to convert below Linq to normal sql query

Question

3.00/5 (2 votes)

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.NET3.5

C#

protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
        {

            LinqChatDataContext db = new LinqChatDataContext();

            var user = (from u in db.Users
                        where u.Username == Login1.UserName
                        && u.Password == Login1.Password
                        select u).SingleOrDefault();


            if (user != null)
            {
                e.Authenticated = true;
                Session["ChatUserID"] = user.UserID;
                Session["ChatUsername"] = user.Username;
            }
            else
            {
                e.Authenticated = false;
            }
        }

Posted 31-Aug-11 23:07pm

rajah rajah

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Prerak Patel · Answer 1 · 2011-08-31T23:15:00

Solution 1

You have to create query like this, and read the values and convert it to object if required.

SQL

"select * from Users where Username = '" + Login1.UserName + "' and Password = '" + Password + "'"

Good practice is to use parameterized query or stored procedure instead.

Posted 31-Aug-11 23:15pm

Prerak Patel

RaisKazi · Answer 2 · 2011-08-31T23:18:00

Try as below code to get SQL Query from your LINQ Query.

C#

LinqChatDataContext db = new LinqChatDataContext();

IQueryable<User> myQuery = (from u in db.Users
                        where u.Username == Login1.UserName
                        && u.Password == Login1.Password
                        select u).SingleOrDefault();

string sqlCommand = LinqChatDataContext.GetCommand(myQuery).CommandText;