indexout of range exception is coming id

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C#

ASP.NET

WebMethod

i am making a webmethod in webservice the mathod fetch student details after submiting value in textbox to server but i am getting error.

my webmethod is

[WebMethod]
   public stu viks( int id) {
       string str = System.Configuration.ConfigurationManager.ConnectionStrings["cccvConnectionString"].ConnectionString;
       SqlConnection con = new SqlConnection(str);
       SqlCommand cmd = new SqlCommand("getstudents", con);
       cmd.CommandType = CommandType.StoredProcedure;
       SqlParameter ccv = new SqlParameter("@id", id);
       cmd.Parameters.Add(ccv);

       stu cc = new stu();
       con.Open();
       SqlDataReader reader = cmd.ExecuteReader();
       while (reader.Read())
       {
           cc.id = Convert.ToInt32(reader["id"]);
           cc.name = reader["name"].ToString();
           cc.gender = reader["gender"].ToString();
           cc.totalmarks = Convert.ToInt32(reader["totalmarks"]);
           con.Close();

       }
       return cc;

my storeprocedure

create proc getstudents22
 @id int
 as
 BEGIN
 select name, gender , totalmarks from students11 where id = @id
 END

and mytable

id int primary key,
name varchar(20),
gender varchar(20),
totalmarks int

kindly try to solve my problem