问ComboBox首先显示System.Data.DataRowView

EN

private void Exercises()
{
    string query = "SELECT X.ExerciseId, X.Naam FROM Xercises AS X " +
            "INNER JOIN MG_Exercise AS MGX ON MGX.ExerciseId = X.ExerciseId " +
            "WHERE MGX.MuscleId = @MuscleId AND X.FitnessId = @FitnessId";

    using (connection = new SqlConnection(connectionString))
    using (SqlCommand command = new SqlCommand(query, connection))
    using (SqlDataAdapter adapter = new SqlDataAdapter(command))
    {
        SqlParameter param = command.Parameters.AddWithValue("@MuscleId", comBoxMuscleGroup.SelectedValue);
        SqlParameter param2 = command.Parameters.AddWithValue("@FitnessId", comBoxTypeFitness.SelectedValue);

        if(param.Value == null)
        {
            param.Value = DBNull.Value;
        }
        if(param2.Value == null)
        {
            param2.Value = DBNull.Value;
        }

        DataTable Xdata = new DataTable();
        adapter.Fill(Xdata);

        clbXcercises.DisplayMember = "Naam";
        clbXcercises.ValueMember = "X.ExerciseId";
        clbXcercises.DataSource = Xdata;
    }
}