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SqlCommand com = new SqlCommand("select * from myuser where username=@UserName and password=@Pwd", con);
           
            com.Parameters.Add(new SqlParameter("@UserName", UserName));
            com.Parameters.Add( new SqlParameter("@Pwd",Pwd));


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Linq to SQL DataContext Lifetime Management


Linq to SQL uses a DataContext to manage it's access to the database as well as tracking changes made to entities retrieved from the database. Linq to SQL has a persistent approach to managing its 'connection' to the database via this data context and it basically assumes that you use a single Dat ......

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