Move common DB operations in base repository

[darkmakukudo]

Just a suggestion to move all common operations in generic base repository.
Your thoughts on this.

public class BaseRepository<TEntity> : IDisposable, IBaseRepository<TEntity> where TEntity : class
    {
        protected readonly SqlConnection conn;

        public BaseRepository()
        {
            var config = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json")
                .Build();

            conn = new SqlConnection(config.GetConnectionString("DefaultConnection"));
        }

        public void Add(TEntity obj)
        {
            conn.Insert(obj);
        }

        public void Dispose()
        {
            conn.Dispose();
        }

        public TEntity FindById(int id)
        {
            throw new NotImplementedException();
        }

        public IEnumerable<TEntity> GetAll()
        {
            //var selectQuery = "SELECT * FROM Test";
            var payloads = conn.GetAll<TEntity>().ToList();
            return payloads;
        }

        public void Remove(TEntity obj)
        {
            throw new NotImplementedException();
        }

        public void Update(TEntity obj)
        {
            throw new NotImplementedException();
        }
    }