parameterised query fails

In the below example,If i pass a single value to mycompany variable say mycompany="100",
the below execquery() method works fine.But when i pass more than one value to parameter then it fails for the below case explained below.
please help me to to make it work.

let us say i have a method that uses the parameterised query like this:

number myid=1000;
var mycompany="100,102,104,105,106";

string sql=select * from employee where id=@0 and company in (@1);

the call to the below method takes place as below:

var dt=executequery(sql,conn,myid,mycompany)

and the method definition is given below:

public static DataTable Executequery(string sql, string connectionString, params object[] args)
{
using (var connection = new SqlConnection(connectionString))
{  using (var command = new SqlCommand(sql, connection))
{
var parameters = args.Select((value, index) => ToSqlParameter(command, index.ToString(CultureInfo.InvariantCulture), value));

command.Parameters.AddRange(parameters.ToArray());

if (connection.State == ConnectionState.Closed)
  connection.open();
 
var dr = command.ExecuteReader();
var dt = new DataTable();
dt.load(dr);
return dt;
}
}



and ToSqlparamer() method definition is given below:It takes the params from args and creates an sqlparameter and adds to it.


SqlParameter ToSqlParameter(SqlCommand command, string name, object value)
{

var p = command.CreateParameter();

p.ParameterName = name;

p.Value = value;

return p;
}