Exception in ExecuteScalar()?

Hi,

I am testing a webservice. Something went wrong in the query. Help me out.

[WebMethod]
    public int login(string name, string pass)
    {
        OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\c#\feedback.mdb");
        con.Open();
        OleDbCommand command = con.CreateCommand();
        command.CommandText = "SELECT pass FROM stud where user=" +name;
        command.ExecuteScalar();
        string p = command.ExecuteScalar().ToString();
        con.Close();
        if (pass == p)
        {
            return 1;
        }
        else
            return 0;
    }