1. Please do not ever do sql like this because you are open to sql injections.
2. You need single quotes around the user.
3. What are you trying to do by passing in the label text inside ()
3. Do something more like this:
cmd.CommandText = "SELCT Emp_Id, Name, Address, District, Pin, Mobile FROM emp WHERE Email = @user"
cmd.Parameters.AddWithValue("@user", user);