Exception Treatment Does Not Work

Question

When I enter letter in txtIdade, the program should return the exception message. But does not return, Visual Studio informs that there is exception without treatment.

try
{
    var conn = new OracleConnection(ConfigurationManager.AppSettings["strConexao"]);
    var comm = new OracleCommand($"insert into Nome(nome,idade,endereco) values ('{txtNome.Text}','{txtIdade.Text}','{txtEndereco.Text}')", conn);

    conn.Open();
    var reader = comm.ExecuteNonQuery();
    read();

}
catch (FormatException ex)
{
    MessageBox.Show(ex.Message, "erro");
    return; 
}