Passing Datatable to a table-Valued Parameter in a stored SQL file does not work

Question

I’m creating a revenue website. On my Masterpage (I am working on ASP.net), I have a search icon and when the user clicks on that icon, I will read three checkboxlists and pass the selected values of each checkboxlist to a Datatable.

The idea is to pass this Datatable as a parameter for a stored process that will later return the recipes that meet the criteria in Datatable. Although the code is working in structural terms, no results are shown.

Stored Procedure and Table Type SQL

 CREATE TYPE dbo.Filtros AS TABLE
(
    Categoria NVARCHAR(50),
    Dificuldade NVARCHAR(50),
    Duracao NVARCHAR(50)
);
GO

ALTER PROCEDURE [dbo].[uspPesquisarReceita] (@TVP dbo.Filtros READONLY)
AS
BEGIN
    SELECT R.NomeReceita, C.NomeCategoria, DF.Dificuldade, D.Duracao, R.ClassificacaoGeral, R.DataPublicacao, R.Foto, R.NumVisualizacoes, R.IDReceita
        FROM dbo.Receitas R 
        LEFT JOIN dbo.Categorias C ON R.IDCategoria = C.IDCategoria
        LEFT JOIN dbo.Dificuldade DF ON R.IDDificuldade = DF.IDDificuldade
        LEFT JOIN dbo.Duracao D ON R.IDDuracao = D.IDDuracao
        WHERE R.IDEstado = 1 AND (C.NomeCategoria IN (SELECT Categoria FROM @TVP) OR DF.Dificuldade IN (SELECT Dificuldade FROM @TVP) OR D.Duracao IN (SELECT Duracao FROM @TVP))
END

C# to fill the TVP passed as parameter for Stored Procedure

public DataTable verFiltros()
        {
            DataTable dtFiltros = new DataTable();
            dtFiltros.Columns.Add("Categoria", typeof(string));
            dtFiltros.Columns.Add("Dificuldade", typeof(string));
            dtFiltros.Columns.Add("Duracao", typeof(string));

            foreach (ListItem item in CheckBoxList1.Items)
            {
                if (item.Selected)
                {
                    DataRow dr = dtFiltros.NewRow();
                    dr["Categoria"] = item;
                    dtFiltros.Rows.Add(dr);
                }
            }

            foreach (ListItem item in CheckBoxList2.Items)
            {
                if (item.Selected)
                {
                    DataRow dr = dtFiltros.NewRow();
                    dr["Dificuldade"] = item;
                    dtFiltros.Rows.Add(dr);
                }
            }

            foreach (ListItem item in CheckBoxList3.Items)
            {
                if (item.Selected)
                {
                    DataRow dr = dtFiltros.NewRow();
                    dr["Duracao"] = item;
                    dtFiltros.Rows.Add(dr);
                }
            }

            return dtFiltros;
        }

Stored Procedure and Datatable used to store recipes that Stored Procedure should return

public SqlDataReader receitaPesquisada(DataConnection conn, DataTable tabelaParam)
        {
            SqlDataReader drObterReceita = null;

            try
            {
                string strCmmd = "uspPesquisarReceita";
                SqlCommand command = new SqlCommand(strCmmd, conn.Connection);
                command.CommandType = CommandType.StoredProcedure;
                SqlParameter param = new SqlParameter("@TVP", tabelaParam);
                param.SqlDbType = SqlDbType.Structured;
                param.TypeName = "dbo.Filtros";
                command.Parameters.Add(param);


                drObterReceita = command.ExecuteReader();

                return drObterReceita;

            }
            catch (Exception ex)
            {
                Console.Write("Algo correu mal no método" + ex.ToString());

                return drObterReceita;
            }
        }

        public DataTable imprimirReceitaPesquisada(DataTable tabelaParam)
        {
            DataConnection conn = new DataConnection();

            DataTable dtbReceitaPesquisada = new DataTable();

            dtbReceitaPesquisada.Columns.Add("NomeReceita", typeof(string));
            dtbReceitaPesquisada.Columns.Add("Categoria", typeof(string));
            dtbReceitaPesquisada.Columns.Add("Dificuldade", typeof(string));
            dtbReceitaPesquisada.Columns.Add("Duracao", typeof(string));
            dtbReceitaPesquisada.Columns.Add("ClassificacaoGeral", typeof(string));
            dtbReceitaPesquisada.Columns.Add("DataPublicacao", typeof(string));
            dtbReceitaPesquisada.Columns.Add("Foto", typeof(string));
            dtbReceitaPesquisada.Columns.Add("NumVisualizacoes", typeof(string));

            try
            {
                conn.openConnection();

                SqlDataReader drObterReceita = this.receitaPesquisada(conn, tabelaParam);

                while (drObterReceita.Read())
                {
                    dtbReceitaPesquisada.Rows.Add(drObterReceita[0].ToString(), drObterReceita[1].ToString(), drObterReceita[2].ToString(), drObterReceita[3].ToString(), Math.Round(double.Parse(drObterReceita[4].ToString()), 1).ToString(), drObterReceita[5].ToString(), drObterReceita[6].ToString(), drObterReceita[7].ToString());
                }
            }
            catch (Exception ex)
            {
                Console.Write("Algo correu mal no método" + ex.ToString());
            }
            finally
            {
                conn.closeConnection();
            }
            return dtbReceitaPesquisada;
        }

Code Behind of the ASP.net page that should show the search result (and currently does not return anything)

public partial class aspnet_ResultadoPesquisa : System.Web.UI.Page
    {
        Receitas novaReceita = new Receitas();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                DataList();
            }
        }

        public void DataList()
        {
            DataTable dtReceitas = new DataTable();
            dtReceitas = novaReceita.imprimirReceitaPesquisada(Master.verFiltros());
            DataList1.DataSource = dtReceitas;
            DataList1.DataBind();
        }
    }

Thanks for the help!