asp.net - asp.net mvc4でGenerics methodeを使用してデータを挿入するには?

Question

これは私のジェネリックメソッドです:

public interface IDataMethods<T>
     { 

    T Find(int id);

    IEnumerable<T> Get();

    bool Add<T>();

    bool Update<T>();

    bool Delete(int id);

}

次のクラスでこのメソッドを継承しています：

public class UserDAL : BaseDAL, IDataMethods<UserModel>
    {
        public IEnumerable<UserModel> Get()
        {
            IDbCommand cmd = Db.GetCommand("SELECT Id, givenName, familyName, email from [User]", CommandType.Text);
            Db.OpenConnection();
            IDataReader result = cmd.ExecuteReader();
            IEnumerable<UserModel> collection = result.SetDataToModels<UserModel>();
            Db.CloseConnection();
            return collection;
        }

        public UserModel Find(int id)
        {
            long ts = 0;
            long te = 0;
            ts = Environment.TickCount;
            IDbCommand cmd = Db.GetCommand("SELECT Id, givenName, familyName, email from [User] WHERE Id=@Id", CommandType.Text);
            cmd.ParamIn("@Id", id.ToString(), DbType.Int32);
            Db.OpenConnection();
            IDataReader result = cmd.ExecuteReader();
            UserModel entity = result.SetDataToModel<UserModel>();
            Db.CloseConnection();
            te = Environment.TickCount - ts;
            return entity;
        }



    public bool Add<T>(UserModel um)
    {
        IDbCommand cmd = Db.GetCommand("INSERT INTO [User] (givenName, familyName, email)VALUES(" + um.givenName + "," + um.familyName + "," + um.email + ")");
        cmd.ParamIn("@givenName", um.givenName, DbType.String);
        cmd.ParamIn("@familyName", um.givenName, DbType.String);
        cmd.ParamIn("@email", um.givenName, DbType.String);
        Db.OpenConnection();
        cmd.ExecuteNonQuery();
        Db.CloseConnection();
        return true;
    }


    public bool Update<T>()
    {
        UserModel um
        IDbCommand cmd = Db.GetCommand("UPDATE [User] SET(givenName=" + um.givenName + ",familyName=" + um.familyName + ",email="+um.email+") WHERE Id="+um.Id+"");
        cmd.ParamIn("@givenName", um.givenName, DbType.String);
        cmd.ParamIn("@familyName", um.familyName, DbType.String);
        cmd.ParamIn("@email", um.email, DbType.String);
        Db.OpenConnection();
        cmd.ExecuteNonQuery();
        Db.CloseConnection();
        return true;
    }

    public bool Delete(int id)
    {
        IDbCommand cmd = Db.GetCommand("DELETE  givenName,familyName,email FROM [User] WHERE Id=@Id", CommandType.Text);
        cmd.ParamIn("@Id", id.ToString(), DbType.Int32);
        Db.OpenConnection();
        cmd.ExecuteNonQuery();
        Db.CloseConnection();
        return true;
    }   
}

ここで、削除と検索は正常に機能していますが、追加と更新は機能していません。この Add と Update の入力パラメーターを渡す方法がわかりません。ここ（UserModel um）は、プロパティを含む私のモデルクラスですが、機能していません。