How to write a method to return a DataTable Object?

public static DataTable ExecuteDataTable(string storedProcedureName,
                                     params SqlParameter[] arrParam)
{
    DataTable dt = new DataTable();  
    using (SqlConnection cnn = new SqlConnection(
           "Data Source=.\sqlexpress;Initial Catalog=NorthWind;
                                    Integrated Security=True"))
    {
        cnn.Open();
      
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.Connection = cnn;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = storedProcedureName;
            if (arrParam != null)
            {
                foreach (SqlParameter param in arrParam)
                    cmd.Parameters.Add(param);
            }
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                da.Fill(dt);
            }
        }
    }
    return dt;
}