password searching

Hi friends

       i want to develop login control with asp.net ,c#, sql server 2005.

•  how i check the TextBox it is validate or not by coding
•  if click on button then user id & password match to textboxes and new  default .aspx page should be open . i can't do next coding exccept it :-  

 

string myConnectString = "Data Source=NBAP25169578480;Initial Catalog=employee;Integrated Security=True";

SqlConnection con = new SqlConnection(myConnectString);

SqlCommand cmd = new SqlCommand("select * from emp where userid = @userid , password = @password ",con);

cmd.CommandType = CommandType.Text;

cmd.Connection = con;

cmd.Parameters.Add ("@userid",TextBox1.Text );

cmd.parameter.Add("@password , TextBox2.Text");  // how i can open new page

cmd.Connection.Open();

cmd.ExecuteNonQuery();

con.Close();